| Entries |
| Document | Title | Date |
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| 20080290938 | Multibit digital amplifier for radio-frequency transmission - A broadband multibit digital radio-frequency (RF) signal is synthesized digitally. to convert the digital signal to a high-power analog signal for RF transmission. Each bit (or cluster of bits) of the digital signal is first separately amplified using a fast switching amplifier with a controlled dc power supply voltage. The DC voltages are weighted to match the significance of the bits, and controlled by a set of calibrated DC reference sources to maintain high precision. The amplified digital signals from the various bits are then combined and passed through an appropriate analog filter to generate the RF signal to be transmitted. Such a signal can exhibit broad bandwidth, high dynamic range, excellent linearity, and low noise. Preferred embodiments of this system can incorporate superconducting electronic elements. For ultimate precision, a set of primary or secondary DC voltage standards can be used to regulate the switching amplifier supply voltages. | 11-27-2008 |
| 20090021302 | METHOD AND APPARATUS FOR REDUCING CURRENT CONSUMPTION OF MIMO SYSTEMS - Apparatus and method for reducing the current consumption and increasing the efficiency of a MIMO system, consisting of one or more RF power amplifiers (PAs) and that is required to provide a desired total output power level. An individual output power level which is a portion of the total output power level is determined for each PA. The load, connected to the output stage of each PA, is dynamically or statically tuned to essentially match the output impedance of its output stage, such that its dynamic or static RF load line has a slope that corresponds to the impedance required to provide this portion. Whenever a smaller output power is desired in response to reduction in the input signal to MIMO system, a reduced portion is determined for each PA and the load is further tuned, such that the dynamic/static RF load line has a slope that causes each PA to essentially remain in saturation while providing the reduced portion. | 01-22-2009 |
| 20090021303 | Distortion-Driven Power Amplifier Power Supply Controller - A power amplifier controller measures the distortion of a power amplifier output. Based upon the distortion measured, the supply voltage to the PA is adjusted in a control loop. In one embodiment, distortion is measured by computing the ratio of the measured power in the output frequencies outside the desired output channel to the measured power in the output frequencies within the desired channel. If the distortion measured from the PA is higher than a target distortion level, the power supply voltage is raised. If the distortion measured from the PA is lower than the target distortion level, the power supply voltage is reduced. Thus, the supply voltage to the PA is maintained at the lowest possible voltage level, improving the efficiency of the PA. | 01-22-2009 |
| 20090045872 | INTEGRATED TRANSCEIVER WITH ENVELOPE TRACKING - A transceiver comprises an amplifying circuit for amplifying an input signal to produce an output signal. A power supply is operable for varying the level of power supplied to the amplifying circuit in response to variation of an input signal envelope directed to the power supply. A processing circuit is operable for digitally detecting the input signal envelope to provide variation of the power supply level. The processing circuit is further operable for digitally delaying the digital input signal envelope to time align the power supply level with the input signal. | 02-19-2009 |
| 20090072898 | Systems and Methods of RF Power Transmission, Modulation, and Amplification, Including Blended Control Embodiments - Embodiments of the present invention enable a blended control approach to generate a desired output waveform in an outphasing-based system. Embodiments of blended control according to the present invention combine outphasing with bias and/or amplitude control to yield an accurate, practical, and producible system with substantially comparable performance to that of a theoretical ideal outphasing system, but without the isolation and accuracy requirements of outphasing alone. | 03-19-2009 |
| 20090128235 | Power save mode for audio interface drive amplifier - An apparatus includes a data processor coupled with a memory that stores a program executable by the data processor; an accessory interface readably coupled with the data processor and an amplifier having an output coupled to the accessory interface and a program input coupled to the data processor. The amplifier is responsive to the program input to change a current consumption of the amplifier in accordance with at least one electrical characteristic associated with an accessory that is connected to the accessory interface. The data processor programs the amplifier to operate in a stable mode of operation while consuming as little current as needed to operate the amplifier in the stable mode of operation. The data processor directly or indirectly determines an amount of capacitance and/or impedance associated with an interface to the accessory, and programs the amplifier accordingly. | 05-21-2009 |
| 20090160548 | POWER AMPLIFYING APPARATUS - A power amplifying apparatus includes a high-speed low pass filter which inputs an envelope signal included in a transmission signal therein, a low-speed low pass filter which inputs the envelope signal therein, a determination unit which inputs the envelope signal therein and determines rising or falling of the envelope signal, a selecting unit which selects one of the high-speed low pass filter and the low-speed low pass filter according to a determined result of the determination unit, and a voltage supply unit which generates a voltage based on a signal input according to a selection by the selecting unit and supplies the voltage to a power amplifier which inputs the transmission signal therein so as to amplify a power of the transmission signal. | 06-25-2009 |
| 20090212859 | AMPLIFIER CIRCUIT AND METHODS OF OPERATION THEREOF - A signal amplifying circuit and associated methods and apparatuses, the circuit comprising: a signal path extending from an input terminal to an output terminal, a gain controller arranged to control the gain applied along the signal path in response to a control signal; an output stage within the signal path for generating the output signal, the output stage having a gain that is substantially independent of its supply voltage, and a variable voltage power supply comprising a charge pump for providing positive and negative output voltages, the charge pump comprising a network of switches that is operable in a number of different states and a controller for operating the switches in a sequence of the states so as to generate positive and negative output voltages together spanning a voltage approximately equal to the input voltage. | 08-27-2009 |
| 20090237157 | POWER AMPLIFIER EDGE EVALUATION-ALTERNATIVE ENVELOPE MODULATOR - A modulator includes a power driver, a power amplifier, and a heterojunction bipolar transistor (HBT) type device. The power driver is for receiving an amplitude modulation signal and for providing a control signal. The power amplifier is for receiving a phase modulation signal, a bias voltage, and the control signal. The power amplifier is for providing a radio frequency signal as an output based on the phase modulation signal, the bias voltage, and the control signal. The switching device is for coupling the power driver to the power amplifier such that the control signal is provided to the power amplifier in a timely manner. | 09-24-2009 |
| 20090322422 | SIGNAL AMPLIFICATION - Apparatus for amplifying a signal, the apparatus comprising an amplifier ( | 12-31-2009 |
| 20100007414 | Gain Control for Linear Radio Freqency Power Amplifiers - A bias control circuit is provided comprising an input port for receiving a signal indicative of an amplitude of a supply voltage provided to a multi stage power amplifier circuit. Electronic circuitry, electrically coupled to the input port, generates a bias control signal in dependence upon the signal indicative of a supply voltage for provision to a first stage power amplifier of the multi stage power amplifier circuit. The bias control signal is generated such that a gain change of the multi stage power amplifier circuit due to a supply voltage change is substantially compensated. | 01-14-2010 |
| 20100033244 | POWER AMPLIFIER SYSTEM AND CONTROL METHOD AND CONTROL DEVICE THEREOF - A power amplifier system, a control method thereof, and a control device thereof are provided. The power amplifier system operates in a non-linear switching mode according to an envelope amplitude of an input signal under control of the control device. When the power amplifier is operated in the non-linear switching mode, a supply voltage and an input signal of the power amplifier are provided to the power amplifier by the control device according to pre-measured properties of the power amplifier so as to equip the power amplifier with a high power-added efficiency (PAE) and a better linearity. | 02-11-2010 |
| 20100127773 | SENSE AMPLIFIER CONTROL CIRCUIT - The present invention discloses a sense amplifier control circuit which controls the sense amplifier. A sense amplifier control circuit comprises a voltage comparing unit outputting delay control signals having a value corresponding to each of divided voltages obtained by dividing a potential of a power supply voltage and a pull-up control signal generating unit outputting an overdrive control signal and a pull-up control signal by an active signal and changing an enable pulse width of the overdrive control signal in response to the delay control signals, whereby it is possible to reduce current consumption caused by unnecessary overdrive operation and prevent a potential drop of the power supply voltage and thus provide operational stability of the semiconductor memory device by providing the overdrive control signal of which the enable pulse width is controlled in response to the potential of the power supply voltage. | 05-27-2010 |
| 20100148864 | Amplifier Control Device - A bias control signal generation unit detects ON and OFF of a transmission signal input to an amplifier and having a property of a burst according to burst information. The bias control signal generation unit controls a bias voltage to be applied to an amplifier such that an idle current flowing through the amplifier can be flowing in a larger amount in a transmission OFF period, and can return to a normal level in a transmission ON period. | 06-17-2010 |
| 20100171553 | POWER CIRCUIT - A power circuit used for an amplifier, which includes an amplifier provided with a linear amplifier serving as a voltage source, a DC/DC converter serving as a current source, a hysteresis comparator controlling the DC/DC converter, and a current detector detecting output current from the linear amplifier to output the detected output current to the hysteresis comparator; and a switching restricting means for restricting a switching interval in the DC/DC converter such that the switching interval is not equal to or less than a constant time or is not shorter than the constant time. | 07-08-2010 |
| 20100244951 | POWER SUPPLY CONTROL SYSTEM AND METHOD WITH VARIABLE POST-REGULATION - A circuit, system and method determine the control voltage for a DC-DC converter. A control module determines a raw battery voltage and an operating temperature. It references a look up table to determine a voltage regulator control voltage based on the battery voltage and the operating temperature during normal operation. In some cases, the control module also uses a level of interference to determine the control voltage. | 09-30-2010 |
| 20100283539 | VOLTAGE DETECTION DEVICE - A voltage detection device detects an objective AC voltage arising on a detection object. The voltage detection device includes; a detecting electrode placed so as to be capacitively coupled with the detection object; a reference signal output section for outputting a reference signal; a detecting section outputting a detection signal changing its amplitude in accordance with both current values of a detection object current flowing according to the objective AC voltage and a reference current flowing according to the reference signal; and a signal extracting section for extracting a signal component of the objective AC voltage from an amplified detection signal and outputting the signal component as an output signal, the amplified detection signal being obtained through controlling a gain for amplifying the detection signal so as to make a signal component of the reference signal included in the detection signal have a predetermined value. | 11-11-2010 |
| 20100301934 | RF POWER AMPLIFIER CONTROLLER CIRCUIT WITH COMPENSATION FOR OUTPUT IMPEDANCE MISMATCH - A power amplifier controller circuit controls a power amplifier based upon an amplitude correction signal indicating the amplitude difference between the amplitude of the input signal and an attenuated amplitude of the output signal. The power amplifier controller circuit comprises an amplitude control loop and a phase control loop. The amplitude control loop adjusts the supply voltage to the power amplifier based upon the amplitude correction signal. The amplitude control loop may also compensate for impedance mismatch with the load by increasing the power delivered from the power amplifier to the load, or decrease the output power of the power amplifier upon detection of excessive power dissipation in the power amplifier. The phase control loop adjusts the phase of the input signal based upon a phase error signal indicating a phase difference between phases of the input signal and the output signal to reduce phase distortion generated by the power amplifier. | 12-02-2010 |
| 20100308908 | EFFICIENCY CONTROLLING MODULE OF POWER AMPLIFIER AND WIRELESS COMMUNICATION DEVICE USING THE SAME - An efficiency controlling module of a power amplifier for wireless communication device includes an attenuator, a filter, and a DC/DC convertor electronically connected in series. The attenuator obtains and attenuates efficiency controlling signals. The filter reduces noise in the efficiency controlling signals. The DC/DC convertor dynamically adjusts an output voltage according to the efficiency controlling signals. | 12-09-2010 |
| 20110018630 | Automatic gain control loop with hysteresis switching - An automatic gain control system with hysteresis switching includes an error calculator for calculating the difference between a first estimation signal and a take over point (TOP) value to produce an error signal. A hysteresis comparator compares the first estimation signal and the TOP value to produce a control signal. A first gain control loop generates a first gain control signal based on the control signal to control a gain of a first variable gain amplifier. A second gain control loop generates a second gain control signal based on the control signal to control a gain of a second variable gain amplifier. As the first estimation signal leaves a hysteresis region of the hysteresis comparator, the first gain control signal is monotonically decreasing and the first gain control signal is monotonically increasing. As a result, the total gain is stable. | 01-27-2011 |
| 20110050337 | SUPPLY VOLTAGE CONTROL DEVICE FOR AMPLIFIER - A supply voltage control device for an amplifier that controls a supply voltage for the amplifier has been improved. The supply voltage control device includes: a supply voltage control circuit including an error amplification circuit that feeds an error current so as to control the supply voltage for the amplifier, and a direct current feed circuit that feeds a direct current (or the direct current and a current of a low-frequency component); a high-frequency component extraction unit that extracts a predetermined high-frequency component contained in a signal resulting from detection of an envelope relevant to a signal to be amplified by the amplifier; a peak hold unit that performs peak hold processing on a signal of the extracted high-frequency component; and an addition unit that adds up a signal based on the result of detection of the envelope relevant to the signal to be amplified by the amplifier, and the signal resulting from the peak hold processing, and inputs a signal resulting from the addition to the supply voltage control circuit. | 03-03-2011 |
| 20110074505 | Offset Voltage Calibration Method and Apparatus and Amplifier Thereof - An offset voltage calibration method is disclosed, which is utilized for calibrating an offset voltage of an electronic device during a calibration period. The offset voltage calibration method includes generating a control signal according to an output signal of the electronic device, counting a count value and generating an offset indication signal according to the control signal, stopping counting and generating a final count value according to a compensation value after the output signal changes state, generating a calibration signal according to the count value or the final count value, and calibrating the offset voltage according to the offset indication signal and the calibration signal. | 03-31-2011 |
| 20110090007 | Multi-stage amplifier - There is disclosed a power supply stage, and a corresponding method, comprising: a plurality of amplifiers for amplifying an input signal, each amplifier receiving a power supply voltage; a common selection means for selecting one of a plurality of power supply voltages in dependence on a reference signal representing a desired power supply voltage; and a plurality of adjusting means, corresponding to the plurality of amplifiers, adapted to generate an adjusted selected power supply voltage for a respective amplifier tracking the reference signal in dependence on the one selected power supply voltage and the reference signal. | 04-21-2011 |
| 20110115557 | AMPLIFYING APPARATUS - An amplifying apparatus includes an amplifier that amplifies a signal, using a voltage supplied; a power source unit that generates a first voltage and a second voltage having an amplitude greater than that of the first voltage; and a switching controller that, when the an envelope signal of the signal becomes current zero, switches between and supplies to the amplifier, the first voltage and the second voltage generated by the power source unit. | 05-19-2011 |
| 20110133834 | POWER AMPLIFIER - There is provided a power amplifier with a variable supply of bias power according to a look-up table having a voltage value determined based on a level of an RF signal being input to the power amplifier to thereby increase power efficiency. A power amplifier according to an aspect of the invention may include an amplification section amplifying an input signal according to a bias voltage being supplied; and a bias supply section comparing a level of the input signal with a look-up table set in advance and supplying a bias voltage to the amplification section according to a result of the comparison. | 06-09-2011 |
| 20110140777 | RF Power Amplifier Controller Circuit Including Calibrated Phase Control Loop - An RF power amplifier system comprises an amplitude control loop and a phase control loop. The amplitude control loop adjusts the supply voltage to the power amplifier based upon the amplitude correction signal indicating the amplitude difference between the amplitude of the input signal and an attenuated amplitude of the output signal. The phase control loop adjusts the phase of the input signal based upon a phase error signal indicating a phase difference between phases of the input signal and the output signal. The phase control loop may comprise one or more variable phase delays introducing a relative phase delay to allow the phase differences between the input and output signals of the PA circuit to be within a range compatible with a phase comparator generating the phase error signal, and a low frequency blocking module that removes the larger extent, lower frequency components of the phase error signal. | 06-16-2011 |
| 20110187452 | SOUND AND MUSIC PLAYBACK DEVICE - A sound and music playback device includes: an output amplifier; a power supply circuit that supplies electric power to the output amplifier; and an output signal level judging circuit; wherein an output voltage value of the power supply circuit is changed based on a level of a sound and music signal to be outputted. | 08-04-2011 |
| 20110193628 | CIRCUIT AND METHOD OF TEMPERATURE DEPENDENT POWER AMPLIFIER BIASING - A circuit and method are provided for reducing dynamic EVM of a power amplifier (PA) used for RF communication. A temperature dependent boost bias signal is applied to the bias input port of amplifier circuitry of the PA in dependence upon a temperature of the amplifier circuitry to compensate for transience in the gain or phase response of the PA while components of the PA is differentially warming-up, advantageously taking into account an actual temperature of the amplifier circuitry. | 08-11-2011 |
| 20110193629 | TRACKING POWER SUPPLY, METHOD FOR CONTROLLING POWER SUPPLY, AND COMMUNICATION APPARATUS - A tracking power supply, a method for controlling a power supply, and a communication apparatus are disclosed. The tracking power supply includes: a basic voltage output unit, configured to provide a basic voltage; and a compensation voltage output unit, configured to provide a compensation voltage. The compensation voltage output unit and the basic voltage output unit are connected in series so as to provide a voltage which is the sum of the basic voltage and the compensation voltage for a load. | 08-11-2011 |
| 20110193630 | Systems and Methods of RF Power Transmission, Modulation, and Amplification, Including Blended Control Embodiments - Embodiments of the present invention enable a blended control approach to generate a desired output waveform in an outphasing-based system. Embodiments of blended control according to the present invention combine outphasing with bias and/or amplitude control to yield an accurate, practical, and producible system with substantially comparable performance to that of a theoretical ideal outphasing system, but without the isolation and accuracy requirements of outphasing alone. | 08-11-2011 |
| 20110234313 | Apparatus and Method for Operating Parameter-Dependent Gain Adjustment in Radio Devices - An amplifier for an input signal S | 09-29-2011 |
| 20110241775 | POWER AMPLIFYING DEVICES - A radio frequency amplifier amplifies a modulation signal or its phase modulation component and outputs the resultant signal. A linear amplifier adds an output voltage to a power supply voltage supplied to the radio frequency amplifier, amplifies a difference between the output voltage and the amplitude modulation component, and outputs the resultant difference. A control signal generation section detects a direction in which an output current of the linear amplifying section flows and generates a pulse modulation signal according to the direction of the current. A switching amplifying section controls connection and disconnection of a DC current based on the pulse modulation signal as a control signal so as to perform switching amplification for an output signal of the linear amplifying section, add the resultant signal to a predetermined DC voltage, and supply the resultant signal as the power supply voltage to the radio frequency amplifier. The DC current and the predetermined DC voltage are supplied to the switching amplifying section. | 10-06-2011 |
| 20110241776 | INFORMATION HANDLING SYSTEM PORT SECURITY - A port securing module includes a power gate that is operable to be coupled in series to a power source and to a load. A resistor is coupled in parallel to the power gate. An operational amplifier includes an inverting input and a non-inverting input that couple the operational amplifier in parallel to each of the power gate and the resistor. The operational amplifier also includes an output that is operable to indicate whether a load is coupled to the power gate and, if a load is coupled to the power gate, supply a voltage to activate the power gate such that power is supplied to the load. | 10-06-2011 |
| 20110260791 | Power Amplifier - A pre-driver for an amplifier comprising a load network in which the following elements are connected in the following order: a resistor-an inductor-a capacitor. Also described are a power amplifier comprising such a pre-driver, a method of fabricating a pre-driver for an amplifier, and a method of performing power amplification. | 10-27-2011 |
| 20110279179 | APPARATUS AND METHOD FOR CONTROLLING POWER AMPLIFIER - An apparatus for controlling a power amplifier configured to amplify radio frequency (RF) signal includes a detector and a controller. The detector is configured to detect a power level of the RF signal with respect to a predetermined power threshold and to generate a corresponding detection signal. The controller is configured to provide a control voltage to an output transistor of the amplifier based on the detection signal. The control voltage has a low voltage value, which is substantially the same as a value of a supply voltage, when the detection signal indicates that the power level is below the power threshold, and the control voltage has a high voltage value when the detection signal indicates that the power level is above the power threshold. The controller generates the high voltage value by boosting the supply voltage. | 11-17-2011 |
| 20110285461 | MOBILE TERMINAL AND METHOD OF CONTROLLING A DRIVING VOLTAGE OF A POWER AMPLIFIER THEREIN - A mobile terminal and method of controlling a driving voltage of a power amplifier therein are provided. The present invention includes a power amplifier module having a plurality of operative modes, the power amplifier module configured to amplify a power strength of an RF signal, a modem configured to deliver the RF signal to the power amplifier module, and to control the operative modes of the power amplifier module, a power detecting unit configured to output a reference voltage by detecting the power strength of the RF signal outputted from the power amplifier module, and a DC/DC converter configured to supply a driving voltage to the power amplifier module by adjusting a detected power value according to a gain corresponding to each of the operative modes of the power amplifier module. | 11-24-2011 |
| 20110285462 | METHOD AND SYSTEM FOR AMPLITUDE CALIBRATION FOR POLAR MODULATION WITH DISCONTINUOUS PHASE - Aspects of a method and system for amplitude calibration for polar modulation with discontinuous phase may include amplifying a signal via a plurality of amplifiers such that a combined gain of the plurality of amplifiers comprises a coarse amplitude gain, an amplitude offset gain and a calibration gain. A gain of one or more of the plurality of amplifiers may be adjusted to set the coarse amplitude gain, and a gain of one or more remaining ones of the plurality of amplifiers may be adjusted to set the amplitude offset gain and the calibration gain. The setting of the coarse amplitude gain, the calibration gain and/or said amplitude offset gain may be adjusted dynamically and/or adaptively. | 11-24-2011 |
| 20110291755 | TRANSMISSION POWER CONTROL METHOD AND TRANSMISSION POWER CONTROL APPARATUS - When switching the mode of a power amplifier between compressed mode and uncompressed mode, accurate transmission power control is realized. A transmission power control method includes setting a power setting value of mode to switch to, such that an inter-mode output power error is canceled (equal to step ST | 12-01-2011 |
| 20110298538 | APPARATUS AND METHOD FOR CURRENT SENSING USING A WIRE BOND - An apparatus for sensing power amplifier current includes a system voltage source that is used to develop a reference voltage, a wire bond structure connected between the system voltage source and a power amplifier, where a sense voltage developed across the wire bond structure is indicative of a current flowing through the power amplifier, and a current source configured to compensate the reference voltage for changes in resistance of the wire bond structure due to a temperature coefficient of the wire bond structure. | 12-08-2011 |
| 20110304390 | COMPENSATION DEVICE APPLIED TO POWER AMPLIFIER, METHOD FOR DETERMINING PRE-DISTORTION OF POWER AMPLIFIER, AND METHOD FOR COMPENSATING LINEARITY OF POWER AMPLIFIER THEREOF - A method for determining pre-distortion of a power amplifier includes the following steps: providing a first power input signal to make the power amplifier generate a first power output signal; receiving a first receiving signal, which is acquired according to the first power output signal; detecting a predetermined gain of the power amplifier by means of the first power input signal and the first receiving signal; providing a second power input signal to make the power amplifier generate a second power output signal; receiving a second receiving signal, which is acquired according to the second power output signal; determining pre-distortion amplitude values and pre-distortion phase values of the power amplifier by means of the predetermined gain, the second power input signal and the second receiving signal. | 12-15-2011 |
| 20110316622 | ELECTRONIC CIRCUIT - An electronic circuit includes an amplifier that amplifies an input signal, a control circuit configured to generate a control signal by averaging an output signal of the amplifier based on a time constant, a first time constant control circuit configured to generate a first time constant control signal based on the control signal, the first time constant control signal changing the time constant of the control circuit to a second time constant from a first time constant smaller than the second time constant, a second time constant control circuit configured to generate a second time constant control signal by averaging the output signal of the amplifier based on a third time constant between the first time constant and the second time constant, the second time constant control signal changing the time constant of the control circuit to the first time constant from the second time constant, and a bypass circuit bypassing the input signal of the amplifier based on the control signal. | 12-29-2011 |
| 20110316623 | METHOD FOR AMPLIFYING A SIGNAL BY A POWER AMPLIFIER, POWER AMPLIFIER SYSTEM, DEVICE, COMPUTER PROGRAM PRODUCT, AND DIGITAL STORAGE MEDIUM THEREOF - The invention relates to a method for amplifying a carrier signal (CS | 12-29-2011 |
| 20120001688 | TRANSMISSION POWER CONTROL METHOD AND TRANSMISSION POWER CONTROL APPARATUS - When switching the mode of a power amplifier between a compressed mode and an uncompressed mode, an accurate transmission power control is realized. A transmission power control method includes calculating an intra-mode output power error from a power setting value in a mode before switching as a comparison standard value error (equal to step ST | 01-05-2012 |
| 20120019319 | Amplitude Error De-Glitching Circuit and Method of Operating - A power amplifier controller circuit controls a power amplifier based upon an amplitude correction signal indicating the amplitude difference between the amplitude of the input signal and an attenuated amplitude of the output signal. The power amplifier controller circuit comprises an amplitude control loop and a phase control loop. The amplitude control loop adjusts the supply voltage to the power amplifier based upon the amplitude correction signal. The RF power amplifier system may reduce the corrective action of the amplitude loop during periods of relatively rapid changes in amplitude, and thus distortion can be further reduced. | 01-26-2012 |
| 20120038418 | dB-LINEAR VOLTAGE-TO-CURRENT CONVERTER - A dB-linear voltage-to-current (V/I) converter that is amenable to implementation in CMOS technology. In a representative embodiment, the dB-linear V/I converter has a voltage scaler, a current multiplier, and an exponential current converter serially connected to one another. The voltage scaler supplies an input current to the current multiplier based on an input voltage. The current multiplier multiplies the input current and a current proportional to absolute temperature and supplies the resulting current to the exponential current converter. The exponential current converter has a differential MOSFET pair operating in a sub-threshold mode and generating an output current that is proportional to a temperature-independent, exponential function of the input voltage. | 02-16-2012 |
| 20120068767 | Power supply arrangement for multi-stage amplifier - There is disclosed a multi-stage amplifier comprising: a first amplifier stage; a second amplifier stage; a first voltage supply stage arranged to provide a supply voltage to the first amplifier in dependence on an average power of a signal to be amplified; and a second voltage supply stage arranged to provide a supply voltage to the second amplifier in dependence on an instantaneous power of a signal to be amplified. | 03-22-2012 |
| 20120105150 | Joint optimisation of supply and bias modulation - A radio frequency amplifier system is disclosed in which the amplifier bias supply and power supply voltages are instantaneously modulated with signals derived from the envelope voltage of the input signal. Separate non-linear mapping functions are used to derive the supply and bias voltages. The two mapping functions are optimised jointly to achieve particular system performance goals, such as optimum efficiency, constant gain, constant phase, or minimum spectral spreading. An optimisation of particular interest is that which achieves best RF amplifier power added efficiency subject to achieving constant amplifier gain. In this way the need for pre-distortion linearization may be reduced or eliminated. | 05-03-2012 |
| 20120126892 | REFERENCE VOLTAGE GENERATOR FOR BIASING AN AMPLIFIER - A method generates a reference voltage by steps including: generating a reference signal from a voltage source; generating a comparison signal of the reference signal with a voltage reference; sampling the comparison signal; adjusting a numerical value as a function of the result of the comparison and of the numerical value; and converting the current numerical value into a voltage corresponding to the reference voltage. | 05-24-2012 |
| 20120154035 | AMPLIFYING DEVICE - An amplifying device which amplifies a signal, includes: an amplifier which amplifies an input signal by a power supplied from a power node; a first power source which supplies a fixed voltage to the power node; a second power source which supplies a variable voltage to the power node based on an envelope signal relating to the input signal and voltage of the power node; an active short device which reduces impedance of the power node when the first power source supplies the power to the power node and the second power source does not supply the power to the power node; a synthesizer which synthesizes the envelope signal and a cancel signal so that the second power source does not supply the power to the power node according to voltage variation of the power node by the active short device. | 06-21-2012 |
| 20120154036 | DIGITAL PRE-DISTORTION POWER AMPLIFYING APPARATUS AND METHOD FOR DIGITALLY CONTROLLING SYNCHRONIZATION THEREOF - A digital pre-distortion (DPD) power amplifying apparatus and a method for digitally controlling synchronization of the DPD power amplifying apparatus, which includes a power amplifier, a bias shifter and a DPD unit, are provided. The method includes acquiring a DPD path delay time at a path along which an input signal is fed back to the DPD unit; delaying an input signal incoming to the power amplifier by the DPD path delay time and acquiring synchronization by delaying a bias signal a predetermined number of times until the bias signal and the delayed input signal are synchronized with each other; and in response to synchronization between the bias signal and the delayed input signal being established, pre-distorting the input signal according to a feedback signal output from the power amplifier. | 06-21-2012 |
| 20120161866 | BIAS CURRENT CONTROL METHOD AND DRIVING CIRCUIT FOR OPERATIONAL AMPLIFIER - A bias current control method for an operational amplifier is disclosed, which includes detecting a slew rate operating signal, determining signal period length of the slew rate operating signal to generate a determination signal, and generating a high bias modulation signal or a low bias modulation signal to the operational amplifier according to the determination signal and the slew rate operating signal. | 06-28-2012 |
| 20120176196 | POWER MANAGEMENT SYSTEM FOR MULTI-CARRIERS TRANSMITTER - A power management system for a multi-carriers transmitter is disclosed. The power management system includes a first switcher having a control input and a power output, and a second switcher having a control input and a power output. Also included is a mode switch having a mode control input, wherein the mode switch is adapted to selectively couple the power output of the first switcher to the power output of the second switcher in response to a mode control signal received by the mode control input. Further included is a control system adapted to generate the mode control signal. The control system is coupled to the mode control input of the mode switch. | 07-12-2012 |
| 20120212293 | BOOST CHARGE-PUMP WITH FRACTIONAL RATIO AND OFFSET LOOP FOR SUPPLY MODULATION - Embodiments disclosed in the detailed description relate to a pseudo-envelope follower power management system for managing the power delivered to a linear RF power amplifier. The pseudo-envelope follower power management system may include a switch mode power supply converter and a parallel amplifier cooperatively coupled to provide a linear RF power amplifier supply to the linear RF power amplifier. The pseudo-envelope follower power management system may include a charge pump configured to power the parallel amplifier. The charge pump may generate a plurality of output voltage levels. The charge pump may be either a boost charge pump or a boost/buck charge pump. The pseudo-envelope follower power management system may include an offset voltage control circuit configured to provide feedback to the switch mode power supply converter to regulate an offset voltage developed across a coupling device that couples the output of the parallel amplifier to the linear RF power amplifier supply. | 08-23-2012 |
| 20120212294 | HIGH EFFICIENCY POWER AMPLIFIER POWER ARCHITECTURE - A distributed power converter is for use with an RF power amplifier and includes a primary converter connected to an input voltage and configured to provide an unregulated DC intermediate voltage that is galvanically isolated from the input voltage. Additionally, the distributed power converter also includes a secondary regulator connected galvanically to the unregulated DC intermediate voltage and configured to generate a regulated DC supply voltage for at least a portion of the RF power amplifier. In another aspect, a method of operating a distributed power converter is for use with an RF power amplifier and includes providing an unregulated DC intermediate voltage that is galvanically isolated from an input voltage and generating a regulated DC supply voltage for at least a portion of the RF power amplifier that is galvanically connected to the unregulated DC intermediate voltage. | 08-23-2012 |
| 20120218038 | AUTOMATIC GAIN CONTROL DEVICE HAVING FREQUENCY RESPONSE UNIT INCLUDED THEREIN AND RELATED AUTOMATIC GAIN CONTROL METHOD THEREOF - An automatic gain control device includes a variable-gain amplifier, a power detector, a gain control unit and a frequency response unit. The variable-gain amplifier is implemented for determining a gain according to a gain control signal and generating an amplified signal by amplifying a received signal according to the gain. The power detector is implemented for determining a power of a frequency response result and accordingly outputting a detection result. The gain control unit is implemented for outputting the gain control signal according to the detection result. The frequency response unit is implemented for performing a frequency response operation on the amplified signal to generate the frequency response result. | 08-30-2012 |
| 20120229208 | Power Control - There is provided an amplification stage comprising: an input scaling block for scaling an input signal in dependence on an input scaling factor to generate a scaled version of the input signal; a power amplifier for generating an amplified version of the scaled input signal; an envelope detector for generating a signal representing the envelope of the input signal; an envelope scaling block for scaling the envelope signal in dependence on an envelope scaling factor to generate a scaled version of the envelope signal; a non-linear mapping block for generating a voltage representative of the supply voltage in dependence on the scaled envelope signal; a modulator for generating a power supply voltage for the amplifier in dependence on the voltage generated by the non-linear mapping block; and a power control block for maintaining a linear relationship between the envelope scaling factor and the input scaling factor. | 09-13-2012 |
| 20120235736 | CHARGE PUMP BASED POWER AMPLIFIER ENVELOPE POWER SUPPLY AND BIAS POWER SUPPLY - The present disclosure relates to a direct current (DC)-DC converter, which includes a charge pump based radio frequency (RF) power amplifier (PA) envelope power supply and a charge pump based PA bias power supply. The DC-DC converter is coupled between RF PA circuitry and a DC power supply, such as a battery. As such, the PA envelope power supply provides an envelope power supply signal to the RF PA circuitry and the PA bias power supply provides a bias power supply signal to the RF PA circuitry. Both the PA envelope power supply and the PA bias power supply receive power via a DC power supply signal from the DC power supply. The PA envelope power supply includes a charge pump buck converter and the PA bias power supply includes a charge pump. | 09-20-2012 |
| 20120235737 | APPARATUS AND METHODS FOR CAPACITIVE LOAD REDUCTION - Apparatus and methods for capacitive load reduction are disclosed. In one embodiment, a power amplifier system includes a power amplifier configured to amplify a radio frequency (RF) signal of a first frequency and an envelope tracker configured to control a supply voltage of the power amplifier using an envelope of the RF signal. The power amplifier system further includes an inductor electrically connected between the power amplifier and the envelope tracker and a capacitor electrically connected between the power amplifier and the envelope tracker. The capacitor and the inductor are configured to have a resonance near the first frequency. | 09-20-2012 |
| 20120235738 | AMPLIFICATION DEVICE - An amplification device that amplifies a signal, the amplification device includes an amplification unit that amplifies the signal using supplied power, a variable power supply unit that changes the power supplied to the amplification unit in accordance with an envelope of the signal, a radiation unit that radiates light onto the amplification unit, and a control unit that controls the light to be emitted from the radiation unit in accordance with slope of the envelope of the signal. | 09-20-2012 |
| 20120249236 | Amplifier Circuit, Mobile Communication Device and Method for Adjusting a Bias of a Power Amplifier - An amplifier circuit includes a power amplifier configured to amplify an RF input signal to obtain an RF output signal, and a bias controller configured to control a bias of the power amplifier. The bias controller is configured to determine a measure of a load impedance of a load coupled to an output of the power amplifier and provide a bias control signal to adjust the bias of the power amplifier based on the determination of the measure of the load impedance. | 10-04-2012 |
| 20120249237 | CORRELATED-LEVEL-SHIFTING AND CORRELATED-DOUBLE-SAMPLING SWITCHED-CAPACITOR GAIN STAGES, SYSTEMS IMPLEMENTING THE GAIN STAGES, AND METHODS OF THEIR OPERATION - Embodiments of apparatus and methods for applying a gain to an input signal are provided. An embodiment of a switched-capacitor gain stage circuit includes an input node, an output node, an operational amplifier, a correlated-double-sampling portion, a correlated-level-shifting portion, and a switching configuration. The operational amplifier has a first amplifier input, a second amplifier input, and an amplifier output. The correlated-double-sampling portion includes a plurality of sampling capacitors arranged in parallel and selectively coupled between the input node and a central node, and an offset storage capacitor including a first terminal coupled to the first amplifier input. The correlated-level-shifting portion includes a correlated-level-shifting capacitor including a first terminal coupled to the output node. The switching configuration has multiple switches that are controllable sequentially to place the gain stage circuit in a sampling state, an approximate output voltage storage state, a level shifting and gain state, and an output state. | 10-04-2012 |
| 20120249238 | Envelope Path Processing for Envelope Tracking Amplification Stage - The invention relates to a method of calibrating an envelope path and an input path of an amplification stage of an envelope tracking power supply, the method comprising matching the envelope path to at least one characteristic of at least one element of the input path. | 10-04-2012 |
| 20120256685 | Power Supply with Tickle Pulse Injection - A power supply injects a series of “tickle” pulses into a pulse width modulated (PWM) controller to induce the controller to generate PWM pulses at a minimum switching frequency, preferably one that is super-sonic (especially for audio applications). The switching frequency may also be selected or controlled such that it avoids resonances in the power supply. The “tickle” pulses may be clocked by the same clock that times the PWM controller, and they may be shaped to help ensure that the power supply maintains some regulation during low-load conditions. | 10-11-2012 |
| 20120262232 | AMPLIFYING DEVICE - A supply voltage controller | 10-18-2012 |
| 20120268203 | Power Management System for Dual Travelling Wave Tube Amplifier - A power management system, notably for a dual travelling wave tube amplifier, includes: two travelling wave tubes, each comprising one Anode Zero electrode, and an electronic power conditioner, the power management system being implemented in said electronic power conditioner and including power management means associated with each travelling wave tube, configured for setting the Anode Zero electrode voltage to a determined minimum value when a sleep mode is activated, the power management means maintaining the travelling wave tube operating power at a value below its nominal working range. A sleep mode can advantageously be combined with an RF-Mute mode. | 10-25-2012 |
| 20120274400 | LOW POWER DISCRETE-TIME ELECTRONIC CIRCUIT - A low power discrete-time electronic circuit includes an amplifier, and a variable current supply. The variable current supply is electrically connected to the amplifier, and is utilized for supplying high current to the amplifier during a switching operation and supplying low current to the amplifier during a non-switching period. | 11-01-2012 |
| 20120293253 | PSEUDO-ENVELOPE FOLLOWING POWER MANAGEMENT SYSTEM - Embodiments disclosed in the detailed description relate to a pseudo-envelope follower power management system used to manage the power delivered to a linear RF power amplifier. | 11-22-2012 |
| 20120293254 | VARIABLE SWITCHED DC-TO-DC VOLTAGE CONVERTER - A voltage converter can be switched among two or more modes to produce an output voltage tracking a reference voltage that can be of an intermediate level between discrete levels corresponding to the modes. One or more voltages generated from a power supply voltage, such as a battery voltage, can be compared with the reference voltage to determine whether to adjust the mode. The reference voltage can be independent of the power supply voltage. | 11-22-2012 |
| 20120299645 | TEMPERATURE CORRECTING AN ENVELOPE POWER SUPPLY SIGNAL FOR RF PA CIRCUITRY - A direct current (DC)-DC converter and radio frequency (RF) power amplifier (PA) circuitry are disclosed. The DC-DC converter provides an envelope power supply signal to the RF PA circuitry based on a first power supply output control signal. As a temperature of the RF PA circuitry changes, the envelope power supply signal may need to be adjusted to meet temperature compensation requirements of the RF PA circuitry. With adequate thermal coupling between the DC-DC converter and the RF PA circuitry, adjustments to the envelope power supply signal may be based on temperature measurements of the DC-DC converter. A desired correction of the first power supply output control signal is determined based on a measured temperature of the DC-DC converter and the temperature compensation requirements of the RF PA circuitry. The first power supply output control signal is adjusted based on the desired correction. | 11-29-2012 |
| 20120299646 | SELECTING A CONVERTER OPERATING MODE OF A PA ENVELOPE POWER SUPPLY - A power amplifier (PA) envelope power supply and a process to select a converter operating mode of the PA envelope power supply are disclosed. The PA envelope power supply operates in one of a first converter operating mode and a second converter operating mode. The process for selecting the converter operating mode is based on a selected communications mode of a radio frequency (RF) communications system, a target output power from RF PA circuitry of the RF communications system, and a direct current (DC) power supply voltage. | 11-29-2012 |
| 20120299647 | PA ENVELOPE POWER SUPPLY UNDERSHOOT COMPENSATION - A power amplifier (PA) envelope power supply, which provides an envelope power supply signal to radio frequency (RF) PA circuitry, and a process to prevent undershoot of the PA envelope power supply is disclosed. The process includes determining if an envelope control signal to the PA envelope power supply has a step change from a high magnitude to a low magnitude that exceeds a step change limit. Such a step change may cause undershoot of the PA envelope power supply. As such, if the step change exceeds the step change limit, the envelope control signal is modified to use an intermediate magnitude for period of time. Otherwise, if the step change does not exceed the step change limit, the envelope control signal is not modified. | 11-29-2012 |
| 20120299648 | AMPLIFYING APPARATUS, TRANSMITTER, AND AMPLIFYING APPARATUS CONTROL METHOD - A power amplifying apparatus has a GaN device for RF amplification, a GaN device for monitoring, an Idq detecting circuit, and a gate bias control (GBC) circuit. The GaN device for RF amplification amplifies an input signal to output the resultant. The GaN device for monitoring is an amplification device for monitoring an input/output signal of the GaN device for RF amplification. The Idq detecting circuit detects an output signal output by the GaN device for monitoring, corresponding to an input signal, which is diverged from the input signal to be input to the GaN device for RF amplification, and is input to the GaN device for monitoring. The gate bias control circuit controls a gate voltage to be applied to the GaN device for RF amplification in accordance with the output signal detected by the Idq detecting circuit. | 11-29-2012 |
| 20120299649 | MULTI-TIER POWER SUPPLY FOR AUDIO AMPLIFIERS - Techniques for providing multiple power supplies in electronic devices are disclosed. According to one aspect of the present invention, an appropriate power supply is provided only to accommodate a volume setting. In other words, there are at least two power supplies, one with a low voltage and the other with a high voltage. The high voltage power supply is only applied when there is a need to accommodate a volume setting. Thus the power consumption of the amplifiers is well controlled. As a result, the designs of the device and heat dissipation therein can be simplified and lowered in cost. | 11-29-2012 |
| 20120313701 | PSEUDO-ENVELOPE FOLLOWER POWER MANAGEMENT SYSTEM WITH HIGH FREQUENCY RIPPLE CURRENT COMPENSATION - Embodiments disclosed in the detailed description relate to a pseudo-envelope follower power management system including a parallel amplifier and a switch mode power supply converter cooperatively coupled to generate a power supply voltage at a power supply output coupled to a linear RF power amplifier. The parallel amplifier output is in communication with the power amplifier supply output. The parallel amplifier governs operation of the switch mode power supply converter and regulates the power amplifier supply voltage base on a V | 12-13-2012 |
| 20120319773 | POWER GENERATING CIRCUIT AND SWITCHING CIRCUIT - Disclosed herein is a power generating circuit including a first transistor in which a second control signal is applied to a control terminal and a first control signal is applied to one end, and which has the other end connected to an output terminal, a second transistor in which the first control signal is applied to a control terminal and the second control signal is applied to one end, and which has the other end connected to the output terminal a third transistor in which one of the first and the second control signals is applied to a control terminal and which has one end grounded, and a fourth transistor in which the other one thereof is applied to a control terminal and which has one end connected to the other end of the third transistor and the other end connected to the output terminal. | 12-20-2012 |
| 20120326781 | TRANSMISSION MODULE AND PHASED ARRAY ANTENNA APPARATUS - A transmission module including a power supply voltage control unit that sets a power supply voltage to the high frequency amplifier in a variable manner, and a control circuit that controls an amplitude control unit, a phase control unit and the power supply voltage control unit. The control circuit and the power supply voltage control unit control the power supply voltage in accordance with an output power of the high frequency amplifier. The transmission module can carry out not only phase control but also amplitude control in a continuous manner, while suppressing amplitude and phase variation, and a high frequency amplifier in the transmission module is made highly efficient. In addition, a large directional gain, a low side lobe level and a low power consumption are achieved, as a phased array antenna apparatus using a transmission module. | 12-27-2012 |
| 20130002347 | COUPLING SYSTEM FOR DATA RECEIVERS - A data receiver, a method of operating a data receiver, and an integrated coupling system in a data receiver are disclosed. In one embodiment, the data receiver comprises an input terminal for receiving an input data signal, an input amplifier for amplifying selected components of the input data signal, and an input signal path for transmitting specified high-frequency components and a baseline component of the input data signal from the input terminal to the input amplifier. The data receiver further comprises a feed-forward resistive network connected to the input terminal and to the input amplifier. This feed forward resistive network is used to forward a low-frequency drift compensation signal from the input terminal to the input amplifier, using a passive resistive network, to compensate for low frequency variations in the input data signal, and to develop a desired bias voltage at the input amplifier. | 01-03-2013 |
| 20130027129 | TRANSMIT CIRCUIT, METHOD FOR ADJUSTING A BIAS OF A POWER AMPLIFIER AND METHOD FOR ADAPTING THE PROVISION OF A BIAS INFORMATION - A transmit circuit includes a power amplifier configured to amplify an RF input signal to obtain an RF output signal, and an antenna tuner configured to transform an antenna impedance to an impedance at an input of the antenna tuner, wherein the input of the antenna tuner is coupled to an output of the power amplifier. The transmit circuit further includes a bias controller configured to control a bias of the power amplifier, wherein the bias controller is configured to provide a bias control signal to adjust the bias of the power amplifier based on a determination of a measure of a load impedance provided to the power amplifier by the antenna tuner. | 01-31-2013 |
| 20130027130 | COLLECTOR BOOST - Embodiments of power amplification devices are described with a power amplification circuit that has more than one amplifier stage and with at least a first voltage regulation circuit and a second voltage regulation circuit configured that provide regulated voltages to these amplifier stages. The power amplification device includes a threshold detection circuit to get better maximum output power performance while preserving power efficiency. The threshold detection circuit is configured to increase a first voltage adjustment gain of the first voltage regulation circuit when a regulated voltage level of a second voltage regulation circuit reaches a first threshold voltage level. In this manner, the first voltage adjustment gain can be initially set to be lower than the second voltage adjustment gain until the second voltage regulation circuit is close or has railed. The first voltage adjustment gain can then be increased to allow the first voltage regulation circuit to also rail. | 01-31-2013 |
| 20130027131 | SOUND OUTPUT DEVICE USING VACUUM TUBE, AUDIO APPARATUS AND METHOD FOR SOUND OUTPUT THEREOF - A sound output device is provided. The sound output device includes a vacuum tube for amplifying an audio signal; a power supply that supplies power to the vacuum tube; a first switch circuit that selectively connects the power supply to the vacuum tube; and a controller that controls the first switch circuit according to whether the vacuum tube is used. | 01-31-2013 |
| 20130033315 | Audio Amplifier Power Supply with Inherent Power Factor Correction - An audio amplifier is powered by a switch mode power supply optimized for audio applications. The power supply includes a rectifier circuit and a discontinuous mode multiphase isolated flyback power circuit and does not require a separate power factor correction stage. The discontinuous mode multiphase isolated flyback power circuit includes multiple isolated flyback converters operating synchronously to each convert a portion of the power and supply a phase-summed direct current voltage to the audio amplifier. | 02-07-2013 |
| 20130049859 | SATURATION PROTECTION OF A REGULATED VOLTAGE - A system for preventing power amplifier supply voltage saturation includes a multiple stage voltage regulator configured to provide a regulated voltage, a power amplifier configured to receive the regulated voltage, and a saturation protection circuit configured to apply a current into a first stage of the multiple stage voltage regulator when the regulated voltage reaches a reference voltage, the applied current causing a subsequent stage of the multiple stage voltage regulator to prevent the regulated voltage from exceeding the reference voltage. | 02-28-2013 |
| 20130057342 | DIGITALLY CONTROLLED POWER SUPPLIES FOR AN AUDIO AMPLIFIER - An audio playback loop circuit including an audio amplifier for amplifying an analog audio signal based on digitally controlled power supplies, and a digitally controlled power supply selection circuit for generating and selecting the digitally controlled power supplies based on a digital signal. | 03-07-2013 |
| 20130093512 | POWER AMPLIFIER AND OPERATION CONTROLLING CIRCUIT THEREOF - There are provided a power amplifier and an operation controlling circuit thereof. The power amplifier includes: a signal generating unit generating a current input signal; an amplifying unit amplifying the current input signal; and a driving circuit unit supplying a driving signal to the amplifying unit, wherein the signal generating unit includes a control circuit unit generating a predetermined voltage signal from input power and a current mirror circuit unit generating the current input signal from the voltage signal. | 04-18-2013 |
| 20130093513 | APPARATUS AND METHOD FOR EXPANDING OPERATION REGION OF POWER AMPLIFIER - An apparatus and a method for expanding an operation region in an envelope tracking power amplifier are provided. The apparatus for amplifying power of a transmission signal includes an amplitude component determination unit, a supply modulator, and a power amplify module. The amplitude component determination unit determines an amplitude component of a transmission signal. The supply modulator generates a supply voltage to be provided to the power amplify module depending on the amplitude component of the transmission signal determined by the amplitude component determination unit. The power amplify module amplifies power of the transmission signal depending on the supply voltage generated by the supply modulator. | 04-18-2013 |
| 20130106508 | INDUCTANCE BASED PARALLEL AMPLIFIER PHASE COMPENSATION | 05-02-2013 |
| 20130113555 | POWER AMPLIFIER WITH IMPROVED POWER EFFICIENCY - Provided is a power amplifier used in a transmitter of a communication system. The power amplifier may include a power amplifier module to amplify power of a transmitting signal, an energy converter module to receive thermal energy generated by the power amplifier module and to convert the received thermal energy into electric energy, and a direct current (DC)-DC converter module to produce DC power using the electric energy generated by the energy converter module and to supply the produced DC power to the power amplifier module. | 05-09-2013 |
| 20130113556 | VOLTAGE, CURRENT, AND SATURATION PREVENTION - In one embodiment, saturation of the control system of a power amplifier is limited by comparing a control voltage at a first control node against a scaled battery voltage, and then drawing an error current away from the first control node when the control voltage exceeds the scaled battery voltage. The first control node may be located after a trans-conductance amplifier in a feedback control system. | 05-09-2013 |
| 20130113557 | AMPLIFYING DEVICE - An efficient amplifying device is achieved. An amplifying device that amplifies a signal subject to amplification is configured as follows. That is, an amplifier (PA | 05-09-2013 |
| 20130135045 | MONOTONIC CONVERSION OF RF POWER AMPLIFIER CALIBRATION DATA - Circuitry, which includes data memory and processing circuitry, is disclosed. The data memory is used to store look-up table (LUT)-based radio frequency (RF) power amplifier (PA) calibration data. The processing circuitry converts at least a portion of the LUT-based RF PA calibration data to provide monotonic response curve-based data. As such, a magnitude of an envelope power supply control signal is determined based on a magnitude of an RF input signal using the monotonic response curve-based data. | 05-30-2013 |
| 20130154732 | POWER MANAGEMENT IN TRANSCEIVERS - Various embodiments are directed to apparatuses and methods to reduce average power dissipation in transceiver stages such as power amplifiers and low noise amplifiers (LNAs) that process signals of varying output amplitudes. Power dissipation may be reduced by varying the supply voltage in sympathy with the amplitude of the signal and/or the stage current density which may also be varied in sympathy with the signal amplitude. | 06-20-2013 |
| 20130169357 | RF Power Amplifier Circuit With Mismatch Tolerance - A radio frequency (RF) power amplifier system adjusts the supply voltage provided to a power amplifier (PA) adaptively, responsive to the measured or estimated power of the RF output signal of the PA. The RF PA system includes a power amplifier (PA) which receives and amplifies an RF input signal to generate an RF output signal at a level suitable for transmission to an antenna. A PA supply voltage controller generates a supply voltage control signal, which is used to control the supply voltage to the final stage of the PA. The supply voltage control signal is generated responsive to the measured or estimated power of the PA RF output signal, and also may be responsive to a parameter indicative of impedance mismatch experienced at the PA output. By controlling this supply voltage to the RF PA, the efficiency of the PA is improved. | 07-04-2013 |
| 20130169358 | High Speed Power Supply System - A power supply system includes a high-speed power supply providing a first output, operating in conjunction with an externally supplied DC source or low frequency power supply which provides a second output. A frequency blocking power combiner circuit combines the first and second outputs to generate a third output in order to drive a load, while providing frequency-selective isolation between the first and second outputs. A feedback circuit coupled to the combined, third output compares this combined, third output with a predetermined control signal and generates a control signal for controlling the high-speed power supply, based on a difference between the third output and the predetermined control signal. The feedback circuit does not control the DC source or the low frequency power supply, but controls only the high-speed power supply. | 07-04-2013 |
| 20130176075 | DUAL PARALLEL AMPLIFIER BASED DC-DC CONVERTER - A direct current (DC)-DC converter, which includes switching circuitry, a first parallel amplifier, and a second parallel amplifier, is disclosed. The switching circuitry has a switching circuitry output. The first parallel amplifier has a first feedback input and a first parallel amplifier output. The second parallel amplifier has a second feedback input and a second parallel amplifier output. A first inductive element is coupled between the switching circuitry output and the first feedback input. A second inductive element is coupled between the first feedback input and the second feedback input. | 07-11-2013 |
| 20130176076 | VOLTAGE REGULATOR, ENVELOPE TRACKING POWER SUPPLY SYSTEM, TRANSMITTER MODULE, AND INTEGRATED CIRCUIT DEVICE THEREFOR - A voltage regulator for use within an envelope tracking power supply system is described. The voltage regulator comprises a voltage regulation module. The voltage regulation module comprises at least one energy storage element, the at least one energy storage element comprising a first terminal operably coupled to a first node of the voltage regulation module, and a second terminal operably coupled to a second node of the voltage regulation module. The voltage regulation module further comprises an input arranged to receive a reference voltage supply signal, the input being selectively couplable to the first node and selectively couplable to the second node, an output selectively couplable to the first node and selectively couplable to the second node, and a ground plane selectively couplable to the second node. | 07-11-2013 |
| 20130181774 | ENVELOPE TRACKING WITH VARIABLE COMPRESSION - Radio frequency (RF) transmitter circuitry, which includes an envelope tracking power supply and an RF power amplifier (PA), is disclosed. The RF PA operates in either a first operating mode or a second operating mode, such that selection of the operating mode is based on compression tolerance criteria. During the first operating mode, the RF PA receives and amplifies an RF input signal using a first compression level. During the second operating mode, the RF PA receives and amplifies the RF input signal using a second compression level, which is greater than the first compression level. The envelope tracking power supply provides an envelope power supply signal to the RF PA. The envelope power supply signal provides power for amplification. | 07-18-2013 |
| 20130200949 | TIMING ALIGNMENT FOR MODULATED SUPPLY - There is disclosed a method, in an amplifier stage comprising an amplifier and a modulated supply, the amplifier being arranged to amplify an input signal and the modulated supply being arranged to generate a supply voltage for the amplifier by tracking an envelope of the signal to be amplified, the method comprising: comparing the relative timing of a signal representing the current drawn by the amplifier from the modulated supply and a signal representing the voltage generated at the output of the modulated supply; and in dependence upon a difference in the relative timing, adjusting the timing of either the input signal to be amplified or the generated supply voltage to reduce the difference in the relative timing. | 08-08-2013 |
| 20130214858 | Dynamic power supply employing a linear driver and a switching regulator - A highly efficient, high control bandwidth and high-speed power supply with a linear driver and a switching regulator for regulating an output based on a control signal. The linear driver has a first input for receiving the control signal and a second input connected to the output for receiving negative feedback. The driver's output is controlled by its two inputs and has a capacitor connected in series with it to generate a capacitor voltage V | 08-22-2013 |
| 20130222057 | POWER SUPPLY PRE-DISTORTION - There is disclosed a method of generating a supply voltage ( | 08-29-2013 |
| 20130229228 | Noise Optimized Envelope Tracking System for Power Amplifiers - A radio frequency (RF) power amplifier system that comprises a power amplifier configured to amplify an RF input signal to generate an RF output signal. The power amplifier has a gain that is controlled by a supply voltage to the power amplifier. An amplitude detector is configured to generate an amplitude signal indicative of an amplitude of the RF input signal. A power supply generates the supply voltage to the power amplifier based on the amplitude signal indicative of the amplitude of the RF input signal. The gain of the power amplifier is allowed to have variations over the amplitude range of the RF input signal in favor of having a supply voltage that is monotonic relative to the amplitude of the RF input signal across an amplitude range of the RF input signal. | 09-05-2013 |
| 20130229229 | DEVICE AND METHOD FOR INCREASING OUTPUT EFFICIENCY OF MOBILE COMMUNICATION TERMINAL - An apparatus and a method for raising an output efficiency in a mobile communication terminal are provided. The apparatus includes a supply modulator and a power amplifier. The supply modulator includes a DC-DC converter, a voltage regulator, and a switching regulator. The supply modulator modulates an envelope component of an input signal to generate power. The power amplifier amplifies a phase component of the input signal using the power generated by the supply modulator as a power source of a collector/drain. The DC-DC converter raises battery power of the mobile communication terminal. The voltage regulator determines an output voltage of the supply modulator using the power raised by the DC-DC converter. The switching regulator determines an output current of the supply regulator using the battery power of the mobile communication terminal. | 09-05-2013 |
| 20130234793 | SPLIT VCC AND COMMON VCC POWER MANAGEMENT ARCHITECTURE FOR ENVELOPE TRACKING - An envelope tracking power supply and transmitter control circuitry are disclosed. The transmitter control circuitry receives a first envelope power supply control signal and a second envelope power supply control signal. The envelope tracking power supply operates in one of a group of operating modes, which includes a first operating mode and a second operating mode. During both the first operating mode and the second operating mode, a first envelope power supply signal is provided to a driver stage based on the first envelope power supply control signal. During the first operating mode, a second envelope power supply signal is provided to a final stage based on the first envelope power supply control signal. However, during the second operating mode, the second envelope power supply signal is provided to the final stage based on the second envelope power supply control signal. | 09-12-2013 |
| 20130307615 | DC-DC CONVERTER FOR ENVELOPE TRACKING - Embodiments provide a DC-DC converter (DC-DC=direct current to direct current) for envelope tracking. The DC-DC converter includes a digital control stage and a driving stage. The digital control stage is configured to provide a digital control signal based on digital information describing an amplitude of a digital baseband transmit signal. The driving stage is configured to provide a supply voltage for an RF amplifier (RF=radio frequency) based on the digital control signal. | 11-21-2013 |
| 20130307616 | SNUBBER FOR A DIRECT CURRENT (DC)-DC CONVERTER - Circuitry, which includes a direct current (DC)-DC converter having a first switching power supply is disclosed. The first switching power supply includes a first switching converter, an energy storage element, a first inductive element, which is coupled between the first switching converter and the energy storage element, and a first snubber circuit, which is coupled across the first inductive element. The first switching power supply receives and converts a DC power supply signal to provide a first switching power supply output signal based on a setpoint. | 11-21-2013 |
| 20130307617 | PSEUDO-ENVELOPE FOLLOWING POWER MANAGEMENT SYSTEM - Embodiments disclosed in the detailed description relate to a pseudo-envelope follower power management system used to manage the power delivered to a linear RF power amplifier. | 11-21-2013 |
| 20130314153 | COLLECTOR BOOST - Embodiments of power amplification devices are described that include a power amplification circuit, a first voltage regulation circuit, and a second voltage regulation circuit. The voltage regulation circuits are configured to provide regulated voltages to the power amplification circuit. The power amplification device also includes a threshold detection circuit to get better maximum output power performance while preserving power efficiency. The threshold detection circuit is configured to increase a voltage adjustment gain of the first voltage regulation circuit when a regulated voltage level of regulated voltage from the second voltage regulation circuit reaches a threshold voltage level. In this manner, the voltage adjustment gain can be increased when the second voltage regulation circuit is close to or has railed. Increasing the voltage adjustment gain when the second voltage regulation circuit is railing or is close to railing improves the power performance and the power efficiency of the power amplification circuit. | 11-28-2013 |
| 20130321076 | Assisting A Load Current of a Switching Voltage Regulator - Embodiments for at methods, apparatus and systems for operating a voltage regulator are disclosed. One method includes generating, by a switching controller, a switching voltage through controlled closing and opening of a series switch element and a shunt switch element, and generating an output voltage by filtering the switching voltage with an output inductor and a load capacitor. The method further includes generating an assisting current based on a value of current conducted through the output inductor, and assisting the load current by summing the assisting current with the current conducted through the inductor. | 12-05-2013 |
| 20130321077 | SWITCHABLE VRAMP LIMITER - A power amplification device is disclosed that includes a power amplification circuit operable to amplify a radio frequency (RF) signal in accordance with an amplification gain, and a voltage regulation circuit operable to generate a regulated voltage. A regulated voltage level of the regulated voltage sets the amplification gain. To help prevent the voltage regulation circuit from saturating, the voltage regulation circuit is configured to reduce a voltage adjustment gain when the regulated voltage level reaches a threshold voltage level. In one embodiment, the threshold voltage level is set to be higher when a band-select signal indicates that the RF signal is being transmitted within a first frequency band, and is set to be lower when the band-select signal indicates that the RF signal is being transmitted within a second frequency band. The spectral performance of the power amplification device thus improves with regard to the second frequency band. | 12-05-2013 |
| 20130335142 | METHOD AND APPARATUS FOR DECREASING POWER CONSUMPTION OF POWER AMPLIFIER - Embodiments of the present invention relate to the communication field and disclose a method and an apparatus for decreasing power consumption of a power amplifier, which minimize the power consumption of the power amplifier and extend the operation time of a mobile terminal. The method includes: obtaining a compensation power control value, where the compensation power control value is a power control value that is input to the power amplifier, and the minimum value of the input voltage is a minimum input voltage that can guarantee normal operation of the power amplifier when a preset power control value is input to the power amplifier; and inputting the minimum value of the input voltage and the compensation power control value to the power amplifier to control the power amplifier to output the preset power value of the antenna port. | 12-19-2013 |
| 20130342270 | ENVELOPE POWER SUPPLY CALIBRATION OF A MULTI-MODE RADIO FREQUENCY POWER AMPLIFIER - The present disclosure relates to envelope power supply calibration of a multi-mode RF power amplifier (PA) to ensure adequate headroom when operating using one of multiple communications modes. The communications modes may include multiple modulation modes, a half-duplex mode, a full-duplex mode, or any combination thereof. As such, each communications mode may have specific peak-to-average power and linearity requirements for the multi-mode RF PA. As a result, each communications mode may have corresponding envelope power supply headroom requirements. The calibration may include determining a saturation operating constraint based on calibration data obtained during saturated operation of the multi-mode RF PA. During operation of the multi-mode RF PA, the envelope power supply may be restricted to provide a minimum allowable magnitude based on an RF signal level of the multi-mode RF PA, the communications mode, and the saturation operating constraint to provide adequate headroom. | 12-26-2013 |
| 20140009227 | OUTPUT IMPEDANCE COMPENSATION OF A PSEUDO-ENVELOPE FOLLOWER POWER MANAGEMENT SYSTEM - A switch mode power supply converter, a parallel amplifier, and a parallel amplifier output impedance compensation circuit are disclosed. The switch mode power supply converter provides a switching voltage and generates an estimated switching voltage output, which is indicative of the switching voltage. The parallel amplifier generates a power amplifier supply voltage at a power amplifier supply output based on a compensated V | 01-09-2014 |
| 20140022012 | INTERFERENCE SUPPRESSION FOR SWITCHED MODE POWER SUPPLY - The invention relates to a switched mode power supply comprising at least one switch and at least one inductor, the at least one switch being arranged to connect one terminal of the at least one inductor to one of a plurality of supply voltages, the other terminal of the at least one inductor providing a supply output, and further comprising a capacitor connected in parallel with the at least one inductor. | 01-23-2014 |
| 20140028390 | ENERGY SOURCE SHARING - Exemplary embodiments are directed to devices and methods for sharing an energy storage element within an electronic device. A device may include a plurality of transmit paths. The device may further include a voltage supply including an energy storage element coupled to each transmit path of the plurality of transmit paths. | 01-30-2014 |
| 20140049317 | POWER AMPLIFIER CIRCUIT - A power amplifier circuit, comprising: an input for receiving an input signal to be amplified; a power supply; an amplifier, coupled to the input and the power supply; and a cascode device coupled between the power supply and the amplifier. The circuit is characterized by: a first current source coupled between the input and the amplifier, configured to provide a biasing current which is proportional to absolute temperature; and a second current source for controlling the cascode device, configured to provide a current which is complementary to absolute temperature (CTAT). | 02-20-2014 |
| 20140055197 | POWER MANAGEMENT ARCHITECTURE FOR MODULATED AND CONSTANT SUPPLY OPERATION - A power management system, which includes a parallel amplifier circuit and a switch mode power supply converter, is disclosed. The switch mode power supply converter cooperatively operates with the parallel amplifier circuit to form the power management system. The power management system operates in one of a high power modulation mode, a medium power modulation mode, and a low power average power tracking mode. Further, during the high power modulation mode and the medium power modulation mode, the power management system controls a power amplifier supply voltage to a radio frequency power amplifier to provide envelope tracking. During the low power average power tracking mode, the power management system controls the power amplifier supply voltage to the radio frequency power amplifier to provide average power tracking. | 02-27-2014 |
| 20140062590 | MULTIPLE POWER SUPPLY INPUT PARALLEL AMPLIFIER BASED ENVELOPE TRACKING - A switch mode power supply converter and a parallel amplifier are disclosed. The switch mode power supply converter is coupled to a modulated power supply output and the parallel amplifier has a parallel amplifier output coupled to the modulated power supply output. Further, the parallel amplifier has a group of output stages, such that each output stage is directly coupled to the parallel amplifier output and each output stage receives a separate supply voltage. | 03-06-2014 |
| 20140077875 | HIGH EFFICIENCY AND HIGH LINEARITY ADAPTIVE POWER AMPLIFIER FOR SIGNALS WITH HIGH PAPR - One embodiment of the present invention provides a system for controlling operations of a power amplifier in a wireless transmitter. During operation, the system receives a baseband signal to be transmitted, and dynamically switches an operation mode of the power amplifier between a high power back-off mode having a first power back-off factor and a normal mode having a second power back-off factor based on a level of the baseband signal. | 03-20-2014 |
| 20140077876 | WIRELESS COMMUNICATION SYSTEM WITH POWER AMPLIFIER MECHANISM AND METHOD OF OPERATION THEREOF - A wireless communication system includes: a switching capacitor; a multi-way switch, having at least a first voltage input port, a second voltage input port, and an intermediate voltage input port, coupled to the switching capacitor; and a CORDIC processor, coupled to the multi-way switch, configured to select the first voltage input port, the second voltage input port, or the intermediate voltage input port. | 03-20-2014 |
| 20140091861 | High Speed Power Supply System - A power supply system includes a high-speed power supply providing a first output, operating in conjunction with an externally supplied DC source or low frequency power supply which provides a second output. A frequency blocking power combiner circuit combines the first and second outputs to generate a third output in order to drive a load, while providing frequency-selective isolation between the first and second outputs. A feedback circuit coupled to the combined, third output compares this combined, third output with a predetermined control signal and generates a control signal for controlling the high-speed power supply, based on a difference between the third output and the predetermined control signal. The feedback circuit does not control the DC source or the low frequency power supply, but controls only the high-speed power supply. | 04-03-2014 |
| 20140103995 | Control Circuit and Method for Controlling an Operation of a Power Amplifier - A control circuit and a method for controlling an operation of a power amplifier core are provided. The power amplifier core is switchable between an envelope tracking operation mode and a non-envelope tracking operation mode. The control circuit is configured to provide a control signal for controlling the operation of the power amplifier core or to process an amplified signal received from the power amplifier core in dependence on the operation mode of the power amplifier core. | 04-17-2014 |
| 20140103996 | FRONT-END AMPLIFIER - A front-end amplifier has an impedance detector that detects an impedance seen looking into an antenna side from a power amplifier from a radio-frequency signal output from the power amplifier and a radio-frequency signal reflected from the antenna, in which a control circuit decides on whether the impedance detected by the impedance detector belongs to a specific region or not, and controls, if the impedance belongs to the specific region, at least one of the bias condition of the power amplifier and the impedance of a variable-matching circuit. | 04-17-2014 |
| 20140111276 | BOOST CONVERTER CONTROL FOR ENVELOPE TRACKING - Techniques for controlling boost converter operation in an envelope tracking (ET) system. In an aspect, an enable generation block is provided to generate an enable signal for a boost converter, wherein the enable signal is turned on in response to detecting that a sum of a first headroom voltage and an enable peak of a tracking supply voltage is greater than an amplifier supply voltage of the ET system. The enable signal may be turned on for a predetermined enable on duration. In another aspect, a target generation block is provided to generate a target voltage for the boost converter, wherein the target voltage comprises the sum of a second headroom voltage and a target peak of the tracking supply voltage. | 04-24-2014 |
| 20140118064 | ELECTRONIC RADIO SYSTEM FOR POWER AMPLIFICATION WITH PROTECTION IN TERMS OF STANDING WAVE RATE AND ASSOCIATED METHOD OF PROTECTION - An electronic radio system for power amplification of a radiofrequency signal having an electronic circuit having at least one in-service amplifier component, a detector measuring at least one electrical parameter of the in-service amplifier component, having at least the intensity of the electric current supplying the in-service amplifier component, a power attenuator adjusting the output power of the electronic circuit, and a programmable circuit receiving and transmitting commands to control the modules of the radio electronic system. The programmable circuit furthermore includes means for obtaining at least one measurement value relating to the intensity of the electric current supplying said in-service amplifier component of said detector and means for controlling said power attenuator in the case where at least one measurement value obtained exceeds a predetermined threshold value corresponding thereto. The invention also relates to an associated electronic circuit protection method. | 05-01-2014 |
| 20140125408 | OUTPUT IMPEDANCE COMPENSATION OF A PSEUDO-ENVELOPE FOLLOWER POWER MANAGEMENT SYSTEM - A switch mode power supply converter, a parallel amplifier, and a parallel amplifier output impedance compensation circuit are disclosed. The switch mode power supply converter provides a switching voltage and generates an estimated switching voltage output, which is indicative of the switching voltage. The parallel amplifier generates a power amplifier supply voltage at a power amplifier supply output based on a combination of a V | 05-08-2014 |
| 20140167842 | POWER CIRCUIT AND METHOD THEREOF - A power circuit and a method thereof are provided. The method includes: determining, by a power controller, a first signal is to be transmitted in the continuous mode or the burst mode; when the first signal is to be transmitted in the continuous mode, activating, by a power controller, a continuous mode converter; when activated, converting, by the continuous mode converter, a first voltage down to a second voltage and supplying the second voltage to the first power amplifier; when the first signal is to be transmitted in the burst mode, activating, by a power controller, a burst mode converter; when activated and the first power amplifier is inactive, receiving, by a burst mode converter, a first current to accumulate a burst energy; and when activated and the first power amplifier is active, supplying, by the burst mode converter, the burst energy to the first power amplifier. | 06-19-2014 |
| 20140167843 | METHOD AND APPARATUS FOR CALIBRATING AN ENVELOPE TRACKING SYSTEM - A method of calibrating an envelope tracking system for a supply voltage for a power amplifier module within a radio frequency (RF) transmitter module of a wireless communication unit. The method includes, within at least one signal processing module of the wireless communication unit, determining combinations of the power amplifier supply voltage and power amplifier input power that provide a power amplifier output power equal to a target output power, obtaining battery current indications for the determined combinations of the power amplifier supply voltage and power amplifier input power, selecting a combination of the power amplifier supply voltage and power amplifier input power that provide a power amplifier output power equal to a target output power based at least partly on the obtained battery current indications therefore, and calibrating the envelope tracking system using the selected combination of the power amplifier supply voltage and power amplifier input power. | 06-19-2014 |
| 20140176237 | ELECTRONIC DEVICE AND CONTROL METHOD THEREOF - An electronic device includes an amplifier which is configured to amplify a sound signal and includes a vacuum tube including a heater configured to heat the vacuum tube; a voltage supply which is configured to supply a first voltage and a second voltage which is higher than the first voltage; and a controller which is configured to control the voltage supply to supply the second voltage to the heater in response to supply of a drive voltage to the amplifier being started and to supply the first voltage to the heater if the vacuum tube reaches a predetermined temperature. | 06-26-2014 |
| 20140184326 | POWER AMPLIFIER - A power amplifier includes: an amplifier; a matching circuit, including a variable reactance magnetic device having a reactance which varies in accordance with a magnetic field, configured to match an output of the amplifier with a certain impedance; an amplitude detector configured to detect the amplitude of an input signal for the amplifier; and a magnetic-field control circuit configured to apply a magnetic field corresponding to the amplitude detected by the amplitude detector to the variable reactance magnetic device. | 07-03-2014 |
| 20140191797 | METHOD AND SYSTEM FOR BOOSTING THE SUPPLY OF POWER AMPLIFIER - The present invention relates to a system for boosting the power supply of an RF power amplifier in high peak to average power ratio applications, wherein said power amplifier is coupled to receive and amplify a digital data stream of a baseband signal, (e.g., which after modulation with a carrier wave are supplied as the RF input signal to said power amplifier to generate an RF output signal). Said system comprises: a) a first circuit for controlling said boost by said digital data stream of said baseband signal in open-loop, wherein the timing of said boost event can be adjusted according to delays in the data stream of said system, wherein said boost event is imparted as a copy of the most significant bits of said baseband signal; and b) a second circuit for adjusting the precise timing of said boost event in such a way that the signal which controls said second circuit is the result of a comparison between a digital form of said RF input signal and/or a digital representation of the waveform of said power supply and said digital baseband signal, wherein said comparison represents the substantial matching of the delays in the paths of RF input signal and said power supply. | 07-10-2014 |
| 20140210548 | SOFT TURN-OFF FOR BOOST CONVERTERS - Techniques for reducing ringing arising from L-C coupling in a boost converter circuit during a transition from a boost ON state to a boost OFF state. In an aspect, during an OFF state of the boost converter circuit, the size of the high-side switch coupling a boost inductor to the load is gradually increased over time. In this manner, the on-resistance of the high-side switch is decreased from a first value to a second (lower) value over time, which advantageously reduces ringing (due to high quality factor or Q) when initially entering the OFF state, while maintaining low conduction losses during the remainder of the OFF state. Further techniques are provided for implementing the high-side switch as a plurality of parallel-coupled transistors. | 07-31-2014 |
| 20140210549 | METHOD AND APPARATUS FOR USING A PROCESSOR CONTROLLED SWITCHER WITH A POWER AMPLIFIER - Aspects disclosed herein relate to using a processor controlled switcher architecture with a high-efficiency PA control. A wireless communications device may be include a processor, a power amplifier and a processor controller PA switcher. In an aspect, the processor may be a modem, a RF chip, etc. In one example, the PA switcher may be configured to receive a switcher control signal on the control line. In an aspect, the switcher control signal may be based on future characteristics of an input signal. The PA switcher may be further configured to select a voltage path from among a plurality of voltage paths based on the switcher control signal to provide a supply voltage to the lower pass filter associated with the PA. | 07-31-2014 |
| 20140232458 | Method and Apparatus for a Multi-Standard, Multi-Mode, Dynamic, DC-DC Converter for Radio Frequency Power Amplifiers - A multi-mode, dynamic, DC-DC converter supplies a dynamically varying voltage, as required, from a battery to an RF power amplifier (PA). In envelope tracking mode, a fast DC-DC converter generates a dynamic voltage that varies based on the amplitude envelope of an RF signal, and regulates the voltage at the PA. A slow DC-DC converter generates a steady voltage and regulates the voltage across a link capacitor. The fast and slow converters are in parallel from the view of the PA, and the link capacitor is between the fast converter and the PA. Because different nodes are regulated, no current sharing is possible between the converters. The link capacitor boosts the dynamic voltage level, allowing a maximum dynamic voltage at the load to exceed the battery voltage. In power level tracking mode, the fast converter is disabled and the link capacitor is configured to be in parallel with the load. The slow converter directly regulates the PA, and the link capacitor is in parallel with (added to) an output capacitor. Multiple wireless network standards may be supported, allowing for the sharing of RF circuits. | 08-21-2014 |
| 20140240040 | Multi-Mode Amplifier System - A multi-mode amplifier system includes a supply converter and a multi-stage amplifier. The supply converter is configured to generate a plurality of varied supply signals according to an output power mode. The multi-stage amplifier is configured to generate an RF output signal from an RF input signal according to the varied supply signals. communication system | 08-28-2014 |
| 20140266426 | SELF SETTING POWER SUPPLY USING NEGATIVE OUTPUT IMPEDANCE - A self-setting power supply monitors a supply current drawn by a power amplifier and sets a supply voltage based on the supply current to achieve efficient power operation. In order to maintain operation of the power amplifier above minimum operating conditions, the self-setting power supply sets the supply voltage to the minimum operating voltage when the supply current drops below a threshold bias current. When the supply current is above the threshold bias current, the self-setting power supply adjusts the supply voltage approximately proportionally to the supply current to maintain approximately constant gain of the power amplifier. | 09-18-2014 |
| 20140266427 | NOISE CONVERSION GAIN LIMITED RF POWER AMPLIFIER - A radio frequency (RF) power amplifier (PA) and an envelope tracking power supply are disclosed. The RF PA receives and amplifies an RF input signal to provide an RF transmit signal using an envelope power supply voltage. The envelope tracking power supply provides the envelope power supply voltage based on a setpoint, which has been constrained so as to limit a noise conversion gain (NCG) of the RF PA to not exceed a target NCG. | 09-18-2014 |
| 20140266428 | ENVELOPE TRACKING POWER SUPPLY VOLTAGE DYNAMIC RANGE REDUCTION - A radio frequency (RF) system includes an RF power amplifier (PA), which uses an envelope tracking power supply voltage to provide an RF transmit signal, which has an RF envelope; and further includes an envelope tracking power supply, which provides the envelope tracking power supply voltage based on a setpoint. RF transceiver circuitry, which includes envelope control circuitry and an RF modulator is disclosed. The envelope control circuitry provides the setpoint, such that the envelope tracking power supply voltage is clipped to form clipped regions and substantially tracks the RF envelope between the clipped regions, wherein a dynamic range of the envelope tracking power supply voltage is limited. The RF modulator provides an RF input signal to the RF PA, which receives and amplifies the RF input signal to provide the RF transmit signal. | 09-18-2014 |
| 20140285261 | CONTROLLED POWER BOOST FOR ENVELOPE TRACKER - An envelope-tracking (ET) power supply may include a boost control pin. The boost control pin receives a boost enable signal that activates or enables a supplemental power supply in the ET power supply. The supplemental power supply facilitates the generation of a power supply signal for a selected processing stage, e.g., a power amplifier. The supplemental power supply helps the processing stage meet the demands on it caused by the signal that the processing stage needs to handle. | 09-25-2014 |
| 20140285262 | CONTROL DEVICE OF POWER AMPLIFIER AND METHOD OF CONTROLLING POWER AMPLIFIER - A control device of a power amplifier includes: a limiter configured to limit a level of an input signal to the power amplifier; and a control unit configured to, when the limiter operates, make an operation voltage of the power amplifier invariable and control load of an output matching circuit of the power amplifier based on an amplitude of the input signal, and, when the limiter does not operate, to make the load of the output matching circuit invariable and control the operation voltage of the power amplifier. | 09-25-2014 |
| 20140285263 | Power Supply with Tickle Pulse Injection - A power supply injects a series of “tickle” pulses into a pulse width modulated (PWM) controller to induce the controller to generate PWM pulses at a minimum switching frequency, preferably one that is super-sonic (especially for audio applications). The switching frequency may also be selected or controlled such that it avoids resonances in the power supply. The “tickle” pulses may be clocked by the same clock that times the PWM controller, and they may be shaped to help ensure that the power supply maintains some regulation during low-load conditions. | 09-25-2014 |
| 20140306756 | Power supply arrangement for multi-stage amplifier - There is disclosed a multi-stage amplifier comprising: a first amplifier stage; a second amplifier stage; a first voltage supply stage arranged to provide a supply voltage to the first amplifier in dependence on an average power of a signal to be amplified; and a second voltage supply stage arranged to provide a supply voltage to the second amplifier in dependence on an instantaneous power of a signal to be amplified. | 10-16-2014 |
| 20140361830 | ENVELOPE TRACKER WITH VARIABLE BOOSTED SUPPLY VOLTAGE - Techniques for efficiently generating a variable boosted supply voltage for an amplifier and/or other circuits are disclosed. In an exemplary design, an apparatus includes an amplifier, a boost converter, and a boost controller. The amplifier receives an envelope signal and a variable boosted supply voltage and provides an output voltage and an output current. The boost converter receives a power supply voltage and at least one signal determined based on the envelope signal and generates the variable boosted supply voltage based on the power supply voltage and the at least one signal. The boost controller generates the at least one signal (e.g., an enable signal and/or a threshold voltage) for the boost converter based on the envelope signal and/or the output voltage. The boost converter is enabled or disabled based on the enable signal and generates the variable boosted supply voltage based on the power supply voltage and the threshold voltage. | 12-11-2014 |
| 20140375382 | MULTIPLE SWITCH POWER STAGE CONTROL TRACKING PCM SIGNAL INPUT - A DC power stage provides a power output that tracks a PCM signal input. A mapping unit generates an integer number of N digital PWM signals each switched at a same switching frequency by switching states of the PWM signals one at a time based on a level of the PCM signal input. An imbalance correction unit adjusts a duty ratio of the PWM signals relative to one another based on differentially accumulating errors among the PWM signals to prevent divergence of PWM signals. N corresponding switches therefrom switch power from a DC power source. N inductances in parallel produce a combined signal that is low pass filtered to provide the power output. Switching is between only those state combinations where the switching frequency is cancelled in the combined signal. The switching frequency is a sampling frequency of the PCM signal input divided by a product of 2 times N. | 12-25-2014 |
| 20140375383 | SWITCHING POWER SUPPLY - A power supply is disclosed herein. For example, a method for controlling the power supply can include dynamically programming a threshold voltage. The method can also include down-converting an input voltage to generate a down converted voltage at an output voltage node. Further, the method can include passing the input voltage to the output voltage node when a supply voltage exceeds the threshold voltage. | 12-25-2014 |
| 20150048883 | Stabilizing a Power Combining Power Supply System - A power supply system comprising a power stabilization stage configured to combine a first reference signal having a first frequency range with a second reference signal having a second frequency range that is different than the first frequency range to generate a combined reference for driving a reference load. A first power supply (e.g. SMPS) is configured to generate a first output based on the first reference signal. A second power supply (e.g. linear regulator) is configured to generate a second output based on the second reference signal. A power combiner circuit is configured to combine the first output with the second output to generate a combined output for driving an output load. | 02-19-2015 |
| 20150061761 | DETERMINATION OF ENVELOPE SHAPING AND SIGNAL PATH PREDISTORTION OF AN ET AMPLIFICATION STAGE USING DEVICE CHARACTERISATION DATA - A method of controlling an envelope tracking amplification stage comprising: in a characterization mode: measuring parameters of the amplification stage to determine at least two of gain, phase and efficiency characteristics for instantaneous values of input power and supply voltage of the amplifier; and for the at least two of gain, phase and efficiency characteristics, generating a three-dimensional plot representing the characteristic with respect to input power and supply voltage applied to the amplifier, and in a use mode: using at least one of the three-dimensional plots to determine a shaping function for the shaping table in dependence on a primary system objective associated with one or more of gain, phase or efficiency; and using the determined shaping function and at least one of the three dimensional plots to determine the pre-distortion coefficients for the pre-distortion block to meet a secondary system objective associated with at least one of gain, phase or efficiency. | 03-05-2015 |
| 20150295550 | POWER MANAGEMENT IN TRANSCEIVERS - Various embodiments are directed to apparatuses and methods to generate a first signal representing modulation data and a second signal representing an amplitude of the modulation data, the first signal and the second signal to depend on an output signal and vary a power supply voltage to a gain stage in proportion to the amplitude of the modulation data. | 10-15-2015 |
| 20150333567 | ELECTRICAL DEVICE - There is provided an electrical device ( | 11-19-2015 |
| 20150349718 | SYSTEMS AND METHODS FOR DELAY CALIBRATION IN POWER AMPLIFIER SYSTEMS - A power amplifier system is provided. The power amplifier system includes a power supply to generate a supply voltage based on an input signal, a power amplifier powered by the supply voltage to amplify the input signal and generate an output signal, a delay determiner to determine a delay mismatch between the input signal and the supply voltage, and a programmable delay block coupled to the delay determiner to compensate for the determined delay mismatch between the input signal and the supply voltage. The delay determiner determines the delay mismatch based on a first delay between the input and output signals when the input signal is below a threshold and a second delay between the input and output signals when the input signal is above the threshold. | 12-03-2015 |
| 20160156318 | SELF SETTING POWER SUPPLY USING NEGATIVE OUTPUT IMPEDANCE | 06-02-2016 |
