| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 330131000 |
Control of bias on separate gain control electrode
| 18 |
| 330136000 |
Bias control signal from input of amplifier
| 16 |
| 330133000 |
Different bias control means for different stages of cascade amplifier
| 11 |
| 330135000 |
Amplitude limiting or bias voltage | 5 |
| 20090015324 | Power amplifier amplitude modulator system and method - A system for controlling amplifier power is provided. The system includes a voltage envelope detector receiving a voltage signal and generating an attenuated voltage envelope signal. A current envelope detector receives a current signal and generates an attenuated current envelope signal. A controller receives power level data and generates attenuation control data for the voltage envelope signal and the current envelope signal. A detector receives the voltage envelope signal and the current envelope signal and generates a control signal based on the greater of the voltage envelope signal and the current envelope signal. A power amplifier level controller receives the control signal and generates a power amplifier level control signal. | 01-15-2009 |
| 20100244952 | GAIN CONTROL CIRCUIT AND ELECTRONIC VOLUME CIRCUIT - A gain control circuit includes a comparator that compares an input gain value with a count value to generate a comparison result signal, a counter that counts up or counts down the count value in accordance with the comparison result signal, and a gain modulator circuit that modulates the count value to generate a gain control signal which changes in a time-divided manner. The gain modulator circuit modulates the count value so that a gain obtained by time-averaging a gain corresponding to the gain control signal matches a gain based on the count value. | 09-30-2010 |
| 20100321109 | Amplifier Compression Adjustment Circuit - An RF power amplifier system adjusts the supply voltage to the power amplifier based upon an amplitude correction signal indicating the amplitude difference between the amplitude of the RF input signal and an attenuated amplitude of the RF output signal of the power amplifier. A variable gain amplifier (VGA) adjusts the amplitude of the RF input signal, thus providing a second means of adjusting the amplitude of the output of the power amplifier. The gain of the VGA or the supply voltage to the power amplifier is controlled based on the AC components of the amplitude correction signal, while the DC components of the amplitude correction signal are blocked from controlling the VGA or the supply voltage to the power amplifier. The DC level of the gain control of the VGA, the average supply voltage to the power amplifier, or the closed loop gain of the overall amplitude correction loop is controlled separately by a compression control signal. | 12-23-2010 |
| 20120126893 | POWER AMPLIFIER, POWER AMPLIFICATION METHOD, AND STORAGE MEDIUM - This invention provides a power amplifier ( | 05-24-2012 |
| 20130241644 | Dynamic Power Control Method and Circuit thereof - The present invention discloses a dynamic power control method utilized in an amplifier. The dynamic power control method includes detecting an absolute difference between a positive supply voltage of the amplifier and an output voltage of the amplifier, to acquire a positive voltage difference; detecting an absolute difference between a negative supply voltage of the amplifier and the output voltage of the amplifier, to acquire a negative voltage difference; and adjusting the positive supply voltage and the negative supply voltage according to the positive voltage difference, the negative voltage difference and a threshold. | 09-19-2013 |
| 330130000 |
Bias controlled by separate external control source | 4 |
| 20110298540 | SYSTEM AND METHOD FOR CONTROLLING A POWER AMPLIFIER USING A PROGRAMMABLE RAMP CIRCUIT - A system and method for controlling a power amplifier using a programmable ramp circuit involves receiving an input bias current at a programmable ramp circuit, generating an output bias current based on the input bias current using the programmable ramp circuit, and transmitting the output bias current from the programmable ramp circuit to a power amplifier for amplifying a radio frequency signal. | 12-08-2011 |
| 20130088293 | METHOD AND APPARATUS FOR PROGRAMMABLE GAIN CONTROL USEFUL WITH DIGITAL TO ANALOG CONVERTER - A programmable gain controller (PGC) useful with a digital to analog converter is coupled to an input node providing a current source that is variable with a level of an input signal such as time sampled audio data, and multiple switches controlled to function as a digital gain control. Each switch is configured to selectively steer a variable fraction of the current provided by a current source to either a current sink node or to an output node of the PGC to provide at least one scaled current. An amplifier is coupled to an output of the PGC. The amplifier is configured to convert scaled current(s) to at least one output signal having an amplitude that is a function of both the input signal level and the digital gain input signal. Controlling the gain by steering current at the analog portion of the apparatus conserves circuit space and reduces noise. | 04-11-2013 |
| 20140232459 | BIAS CIRCUIT AND AMPLIFIER WITH CURRENT LIMIT FUNCTION - There are provided a bias circuit and an amplifier having a current limit function, including: a control voltage generating unit generating a control voltage using a reference voltage; a bias voltage generating unit generating a bias voltage according to the control voltage; and a bias current limit unit controlling the control voltage according to a bias current of the bias voltage generating unit. | 08-21-2014 |
| 20140266429 | POWER MANAGEMENT/POWER AMPLIFIER OPERATION UNDER DYNAMIC BATTERY DROPS - In one embodiment, a digital internal amplified voltage of power management circuitry is forced to an input threshold voltage upon a determination that a set of emergency conditions is satisfied, and is set to an input minimum battery voltage upon a determination that the set of emergency conditions is not satisfied. The emergency conditions may include determining that a battery voltage is less than a threshold voltage and determining that an input minimum battery voltage is less than an input threshold voltage. | 09-18-2014 |
| 330134000 |
Plural different bias control voltages provided by separate means | 2 |
| 20090002068 | Dynamic Biasing System For An Amplifier - A dynamic biasing system (“DBS”) for dynamically biasing an amplifier with an adjusted bias signal is shown. The DBS may include a first biasing circuit that produces a bias signal and a second biasing circuit in signal communication with both the first biasing circuit and the amplifier, wherein the second biasing circuit compares the bias signal to a predetermined threshold and in response produces the adjusted bias signal. | 01-01-2009 |
| 20140043098 | Mobile Device Including a Power Amplifier with Selectable Voltage Supply - The present application discloses various implementations of a mobile device including a power amplifier (PA) having a driving stage coupled to an output stage. The driving stage is configured to be selectably powered by one of a first voltage supply and a second voltage supply. The output stage is configured to be powered by the second voltage supply. The mobile device further includes a voltage supply selection switch configured to selectably power the driving stage by the second voltage supply when an output power of the PA is less than or equal to a threshold power. | 02-13-2014 |
| 330132000 |
Frequency selective means to select control signal from amplifier channel | 1 |
| 20080204135 | METHOD AND SYSTEM FOR LOW NOISE AMPLIFIER (LNA) GAIN ADJUSTMENT THROUGH NARROWBAND RECEIVED SIGNAL STRENGTH INDICATOR (NRSSI) - A method for processing a plurality of signals may include amplifying an input signal and generating a wideband signal from the amplified input signal. The method may further include bandpass filtering the generated wideband signal to generate a narrowband signal, and adjusting amplification of the input signal based on a narrowband received signal strength indication of the generated narrowband signal, and/or a wideband received signal strength indication of the generated wideband signal. The amplified input signal may be downconverted to generate the wideband signal. The amplified input signal may be downconverted to an intermediate frequency (IF) and/or to a baseband signal to generate the wideband signal. At least one blocker signal may be bandpass filtered from the amplified input signal. | 08-28-2008 |
| 330137000 |
Oscillator supplies or controls bias | 1 |
| 20130249630 | Frequency Stabilization in Nonlinear MEMS and NEMS Oscillators - An illustrative system includes an amplifier operably connected to a phase shifter. The amplifier is configured to amplify a voltage from an oscillator. The phase shifter is operably connected to a driving amplitude control, wherein the phase shifter is configured to phase shift the amplified voltage and is configured to set an amplitude of the phase shifted voltage. The oscillator is operably connected to the driving amplitude control. The phase shifted voltage drives the oscillator. The oscillator is at an internal resonance condition, based at least on the amplitude of the phase shifted voltage, that stabilizes frequency oscillations in the oscillator. | 09-26-2013 |
| 330139000 |
Electronic tube controls bias | 1 |
| 20090021304 | Model based distortion reduction for power amplifiers - A method of processing a signal is disclosed. The method comprises generating a digital signal, converting the digital signal to an analog signal, and generating an amplified analog signal having distortions. The method further comprises converting the amplified analog signal to a feedback digital signal at a sample rate and updating a model of the distortions based on the feedback digital signal. | 01-22-2009 |
| 330140000 |
Rectifier in bias control circuit | 1 |
| 20080218261 | RF Power Amplifier Mirror Circuit for Sensing Current - An apparatus and method is disclosed for providing a mirror circuit for detecting a change in current of a RF power amplifier. The mirror circuit includes a voltage operably coupled with the mirror circuit, a bias circuit operably coupled with the mirror circuit, wherein the bias circuit is capable of applying a bias voltage to the mirror circuit, and an output reference signal. The output reference signal is proportional to the change of current in the RF power amplifier. | 09-11-2008 |
| Entries |
| Document | Title | Date |
|---|
| 20080211575 | Loop Gain Equalizer For Rf Power Amplifier - The output power of an RF power amplifier is controlled using a feedback loop including a differential integrator for controlling the amplifier's bias voltage. The gain of integration in the differential integrator is varied so as to compensate for variations in the derivative of the power amplifier output power versus the bias voltage. | 09-04-2008 |
| 20090066414 | Gain control methods and systems in an amplifier assembly - A Variable Gain Amplifier (VGA) amplifies an input signal according to a gain, to produce an amplified signal. A detector module detects a power indicative of a power of the amplified signal. A comparator module compares the detected power to a high threshold, a low threshold and a target threshold intermediate the high and low thresholds. A controller module changes the gain of the VGA so as to drive the detected power in a direction toward the middle threshold when the comparator module indicates the detected power is not between the high and low thresholds. | 03-12-2009 |
| 20090079498 | OFFSET CANCELLATION IN A CAPACITIVELY COUPLED AMPLIFIER - A method for calibrating an offset voltage of an amplifier used to amplify capacitively coupled communication signals is described. During this process, a common voltage is applied to one or more inputs to the amplifier. Next, an output of the amplifier is iteratively, measured, and charge is applied to the one or more inputs until the offset voltage is less than a pre-determined value. Note that applying the charge may involve applying a sequence of one or more charge pulses. | 03-26-2009 |
| 20090102555 | Automatic gain Control (AGC) with lock detection - A method, algorithm, circuits, and/or systems for automatic gain control (AGC) are disclosed. In one embodiment, an AGC circuit can include a comparator configured to compare an output of an amplifier against a reference voltage, gain logic configured to decrease a gain of the amplifier when an output of the comparator has a first state, and to periodically increase the gain of the amplifier, a digital-to-analog converter (DAC) configured to receive an output from the gain logic and control the gain of the amplifier, and lock detection logic configured to determine from the output of the gain logic when the gain of the amplifier is in a predetermined range. | 04-23-2009 |
| 20090108931 | PROGRAMMABLE GAIN CIRCUIT - A programmable gain circuit suitable for a programmable gain amplifier is described. In one design, the programmable gain circuit includes multiple attenuation circuits coupled in series. Each attenuation circuit operates in a first mode or a second mode, attenuates an input signal in the first mode, and passes the input signal in the second mode. The multiple attenuation circuits may provide the same or different amounts of attenuation. The multiple attenuation circuits may include binary decoded attenuation circuits and/or thermometer decoded attenuation circuits. In one design, each attenuation circuit includes a divider circuit and at least one switch. The switch(es) select the first mode or the second mode. The divider circuit attenuates an input signal in the first mode and passes the input signal in the second mode. The programmable gain circuit may have a predetermined input impedance and a predetermined output impedance for all gain settings. | 04-30-2009 |
| 20090167435 | POWER CONTROL CIRCUIT AND POWER CONTROL METHOD - A power control circuit includes: a fine adjustment variable amplifying unit configured to amplify the input signal in accordance with a first gain set value; a coarse adjustment variable amplifying unit configured to amplify the input signal in accordance with a second gain set value; a branching unit configured to branch an output signal into a feedback signal; a comparing unit configured to compare a gain value between the input signal and the output signal with the required gain set value; a control unit configured to determine the first gain set value and the second gain set value based on the required gain set value; and an adjusting unit configured to adjust the first gain set value and the second gain set value so that the power value of the feedback signal becomes a power value corresponding to the required gain set value. | 07-02-2009 |
| 20100033245 | Controlling the performance of a thermionic tube - Controlling the performance of the thermionic tube ( | 02-11-2010 |
| 20100045374 | GAIN ADJUSTMENT DEVICE AND METHOD THEREOF - A gain adjustment device and a method thereof are provided. The device includes a first processing module, a gain adjustment circuit, a second processing module, and a gain control module. The first processing module receives an input signal and generates a first signal. An operating voltage of the first processing module is a first voltage. The gain adjustment circuit receives the first signal and adjusts a gain of the first signal according to a gain control signal to output a third signal. The second processing module receives the third signal and generates a second signal. An operating voltage of the second processing module is a second voltage. The gain control module generates the gain control signal according to the first voltage and the second voltage. | 02-25-2010 |
| 20100134184 | HYBRID POWER CONTROL FOR A POWER AMPLIFIER - A hybrid power control system ( | 06-03-2010 |
| 20100259327 | Automatic Gain Control Method and Apparatus - Automatic gain control method and apparatus control a gain of a received signal. While the gain is adjusted and thus converges, a finding mode is entered to additionally change the gain at least once according to at least one characteristic value obtained from a relationship between the gain and time, such that the gain approaches a target level. In other embodiments, a tracking mode is further entered to periodically adjust the gain at a period greater than that before when signal strength is being tracked to reduce noise energy introduced. Hence, the embodiments can improve a gain converging speed and reduce the influence of the noise on the communication system in a dynamic receiving environment, and thus enhance the signal receiving performance. | 10-14-2010 |
| 20100277235 | Gain Control Methods and Systems in an Amplifier Assembly - A Variable Gain Amplifier (VGA) amplifies an input signal according to a gain, to produce an amplified signal. A detector module detects a power indicative of a power of the amplified signal. A comparator module compares the detected power to a high threshold, a low threshold and a target threshold intermediate the high and low thresholds. A controller module changes the gain of the VGA so as to drive the detected power in a direction toward the middle threshold when the comparator module indicates the detected power is not between the high and low thresholds. | 11-04-2010 |
| 20110068866 | Amplifying device - An amplifying device includes a selecting section that selects one of a first power source potential and a second power source potential which are different from each other, a potential generating circuit that generates a third power source potential from the power source potential selected by the selecting section, an amplifier that operates with supply of the first power source potential and the third power source potential, and a controlling circuit that variably controls a target to be selected by the selecting section in accordance with at least one of an amplitude of a signal on an input side of the amplifier, an amplitude of a signal on an output side of the amplifier, and the third power source potential. | 03-24-2011 |
| 20110140778 | AUTOMATIC GAIN CONTROL METHOD AND APPARATUS - An automatic gain control method of a receiving apparatus is provided. The automatic gain control method includes low-noise amplifying a signal using a first gain value, amplifying the low-noise amplified signal to a second gain value, determining the first gain value using a strength of the low-noise amplified signal, and determining the second gain value using the signal amplified to the second gain value. Accordingly, the reliability of the automatic gain control may be guaranteed. | 06-16-2011 |
| 20110148519 | POWER AMPLIFIER POWER CONTROLLER - A power amplifier power controller in the power amplifier system monitors various operating conditions of the power amplifier, and controls the output transmit power of the power amplifier by coordinated control of both the input drive level to the power amplifier and the gain of the power amplifier. The power amplifier power controller controls the input drive level to the power amplifier so that the input drive level does not change substantially while adjusting the gain of the power amplifier to maximize the transmit power. The power amplifier power controller may also adjust the input drive level by some portion of the overall change required to the power of the power amplifier, while adjusting the gain of the power amplifier by the remaining portion of such overall change. | 06-23-2011 |
| 20110181354 | RECEPTION DEVICE AND ELECTRONIC DEVICE USING THE SAME - A reception device according to the present invention includes: a step-variable gain amplifier; and a controller operable to control the gain of the step-variable gain amplifier based on the signal quality value of a demodulator. The gain of the step-variable gain amplifier varies within N gains from a first gain to an N-th gain, and the controller changes a number of the gain one by one when changing the gain of the step-variable gain amplifier. Thus, it is possible to realize a reception device using the step-variable gain amplifier requiring a low control voltage as compared to a continuously-variable gain amplifier. | 07-28-2011 |
| 20110221523 | OPERATING PARAMETER CONTROL FOR A POWER AMPLIFIER - A method of controlling operating parameters of a radio frequency power amplifier amplifying an input signal applied in bursts with controlled input power to an input of the power amplifier, comprising responding to gain variation parameters relating to variations in the scalar gain of said amplifier starting during an initial ramp-up period of a first burst to control supply voltage and quiescent current parameters for said amplifier during a subsequent burst. | 09-15-2011 |
| 20110267142 | MULTI-STATE DC-DC CONVERTER - DC-DC converters adapted to provide two or more DC output voltages. More particularly, a multi-state or mode DC-DC converter circuit comprising first and second controllable switches configured for unidirectional conduction of charging current. | 11-03-2011 |
| 20110291756 | METHOD AND SYSTEM FOR POLAR MODULATION WITH DISCONTINUOUS PHASE FOR RF TRANSMITTERS WITH INTEGRATED AMPLITUDE SHAPING - Aspects of a method and system for polar modulation with discontinuous phase for RF transmitters with integrated amplitude shaping 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 pulse-shaping gain. A gain of one or more of the plurality of amplifiers may be adjusted to set the coarse amplitude gain. A gain of one or more of the plurality of amplifiers may be adjusted to set the amplitude offset gain and the pulse-shaping gain, wherein the one or more of the plurality of amplifiers used to set said amplitude offset gain and said pulse-shaping gain are distinct from the one or more of said plurality of amplifiers used to set the coarse amplitude gain. | 12-01-2011 |
| 20110291757 | DISTRIBUTED THRESHOLD ADJUSTMENT FOR HIGH SPEED RECEIVERS - According to one general aspect, a distributed threshold adjuster (DTA) may be interspersed between stages of a multistage amplifier to adjust the DC voltage of an input signal. The DTA may include an input signal terminal configured to receive the input signal. The DTA may also include a plurality of current sources configured to produce an adjustment current signal whose amperage is configured to be increased or decreased by fixed steps in order to adjust the DC voltage of the input signal. The DTA may include a control unit configured to selectively turn on or off the individual current sources of the plurality of current sources to select the amperage of the adjustment current signal. The DTA may further include an output terminal configured to produce an output signal, comprising a combination of the input signal and the adjustment current signal, to a stage of a multistage amplifier. | 12-01-2011 |
| 20110298539 | 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. | 12-08-2011 |
| 20120154037 | AMPLIFIER CURRENT CONSUMPTION CONTROL - The audio amplifier includes a variable gain amplifier receiving the input audio signal and providing the output signal, whereby the output signal corresponds to the input signal amplified by a limiter gain. The audio amplifier further includes a limiter gain calculation unit, thus the input signal is amplified by the limiter gain. A control unit receives a signal representative of the input signal and is configured to estimate, based on a mathematical model, the input current or the total output current of the audio amplifier thus providing an estimated current signal corresponding to (and resulting from) the output signal, whereby the limiter gain calculation unit is configured to calculate, dependent on the estimation, the limiter gain such that the actual input current or the total output current of the audio amplifier does not exceed a threshold current value. | 06-21-2012 |
| 20120212295 | Power Amplifier Apparatus, and Receiving Apparatus of a User Equipment - A Power Amplifier (PA) apparatus includes a first stage PA tube, configured to amplify gain of input signals. A first stage bias circuit is connected to the first stage PA tube and is configured to provide bias voltage for the first stage PA tube. A second stage PA tube is configured to amplify gain of output signals of the first stage PA tube. A second stage bias circuit is configured to provide bias voltage for the second stage PA tube. A reference voltage unit is connected to the first stage bias circuit and the second stage bias circuit. A voltage control unit is connected to the first stage bias circuit and the second stage bias circuit and is configured to connect and disconnect the first stage PA tube through the first stage bias circuit, and connect and disconnect the second stage PA tube through the second stage bias circuit. | 08-23-2012 |
| 20120218039 | SYSTEMS AND METHODS FOR SATURATION CORRECTION IN A POWER CONTROL LOOP - A power amplification circuit includes a power amplifier, an RF detector, an error amplifier, a saturation detector, and an offset circuit. The power amplifier provides an amplified signal based on an input signal and a gain control signal. The RF detector provides a detection signal indicative of a logarithm of the power of the amplified signal. The error amplifier provides the gain control signal based on an amplification control signal and the detection signal. The saturation detector provides a saturation signal in response to the gain control signal differing from a reference signal by less than a first predetermined voltage. The offset circuit decreases a voltage level of the amplification control signal by up to a second predetermined voltage in response to the saturation signal and the amplification control signal differing from the detection signal by less than the second predetermined voltage. | 08-30-2012 |
| 20120235739 | PROGRAMMABLE GAIN AMPLIFIER WITH MULTI-RANGE OPERATION FOR USE IN BODY SENSOR INTERFACE APPLICATIONS - A system for analyte measurement includes a programmable gain amplifier including a first input terminal operatively coupling to the output of a sensor for sensing an analyte, a second input terminal operatively coupling to a voltage source, and an output terminal for providing an output based on a difference between inputs on the first input terminal and the second input terminal A controller is operatively coupled to the programmable gain amplifier for configuring the operation range of the programmable gain amplifier and/or selecting the output of the programmable gain amplifier for analyte measurement. The method includes monitoring an output from a programmable gain amplifier operatively coupling to a sensor for sensing an analyte, and controlling the operation range of the programmable gain amplifier, and/or selecting the output of the programmable gain amplifier for analyte measurement. | 09-20-2012 |
| 20120235740 | Low-Cost Magnetic Stripe Reader Using Independent Switching Thresholds - A F/2F waveform generator has a comparator and an analog multiplexer. In a low-cost magnetic card reader application, a magnetic track signal is amplified, filtered, and compared with a threshold signal to create a digital signal output. The analog multiplexer detects changes in state of the digital signal. When a change of state is detected, the analog multiplexer switches among dynamically tunable threshold signals. The selected threshold signal is used for comparison with the magnetic track signal. Switching level detection enables accurate F/2F waveform generation from relatively noisy magnetic track signals, thus improving the robustness of magnetic card readers. The analog implementation eliminates the need for expensive A/D conversion and processing and the design can be readily implemented in a very compact and low-cost package. | 09-20-2012 |
| 20120249239 | CORRELATED-DOUBLE-SAMPLING SWITCHED-CAPACITOR GAIN STAGES, SYSTEMS IMPLEMENTING THE GAIN STAGES, AND METHODS OF THEIR OPERATION - Embodiments of switched-capacitor gain stage circuits and methods of their operation are provided. The circuit includes an operational amplifier, parallel sampling capacitors, an offset storage capacitor coupled to an amplifier input, and multiple switches that are configurable to place the gain stage circuit in a sampling state, a gain state, and an output state. In the sampling state, the switches are configured so that a first charge component representing an input signal is stored on the sampling capacitors, and a second charge component representing an amplifier offset voltage is stored on the offset storage capacitor. In the gain state, the switches are configured so that a third charge component representing a finite gain of the amplifier is stored on the offset storage capacitor. In the output state, the switches are configured so that the first, second, and third charge components contribute to an output signal produced at the output node. | 10-04-2012 |
| 20120262233 | MIXED SIGNAL DYNAMIC RANGE COMPRESSION - This document discusses, among other things, apparatus and methods for providing dynamic range compression. In an example, an amplifier can an first amplifier configured to receive a representation of an input signal and provide an amplified representation of the input signal to an output stage, an automatic gain control comparator configured to provide automatic gain control information to the first amplifier, a plurality of dynamic range compression comparators configured to provide a plurality of signals indicative of an amplitude of an output signal of the output stage, a first voltage divider configured to provide an automatic gain control threshold to the automatic gain control comparator, and a second voltage divider configured to receive the automatic gain control threshold and to provide a plurality of range compression thresholds to the plurality of dynamic range compression comparators. | 10-18-2012 |
| 20120299650 | Self-Calibrating Gain Control System - A circuit for self-calibrating a gain control system samples the output of a digital amplifier coupled in series with one or more analog amplifiers to correct errors in a discrete stepped gain control. A digital gain control circuit controls both the digital amplifier and at least one analog amplifier to produce a smooth linear and continuous gain, wherein perturbations in the digital control of gain are smoothed by a signal applied to gain control circuit by a gain step correction circuit. | 11-29-2012 |
| 20120319774 | MULTI-STAGE GAIN CONTROL IN RECEIVERS AND OTHER CIRCUITS - Techniques and devices are disclosed to provide multi-stage gain control in circuits or devices having two or more stages of signal amplification. A circuit with multi-stage gain control can include amplification stages coupled to receive an input signal and to produce an amplified output signal. Each amplification stage includes an amplifier that is adjustable in gain and a signal detector that is coupled to measure an output signal of the amplifier and to produce a detector signal indicative of a signal strength of the output signal of the amplifier. A gain control circuit is coupled to receive detector signals from the signal detectors in the amplification stages, respectively, and to control gains of the amplifiers of the amplification stages based on respective received detector signals, respectively. | 12-20-2012 |
| 20120319775 | AUTOMATIC GAIN CONTROL APPARATUS AND METHOD - An automatic gain control apparatus for a wireless receiver, including multiple variable gain amplifiers, one variable gain amplifier provided for each one of multiple receive chains and a gain controller to control a gain of the variable gain amplifiers provided for the plurality of receive chains. The gain controller includes multiple output level measurement units to measure an output level of a corresponding receive chain; a common gain determination unit to determine a common gain for each of the variable gain amplifiers based on a statistical value obtained from the output levels; multiple adjusted gain determination units, each adjusted gain determination unit determining an adjusted gain independently for each variable gain amplifier within a range narrower than the range of the common; and a gain setting unit to set a gain to each of the variable gain amplifiers based on the common gain and the adjusted gain. | 12-20-2012 |
| 20130049860 | BICYCLE-USE MEASURING APPARATUS AND CONTROL METHOD - A bicycle-use measuring apparatus includes a sensor, a signal amplifying section and a gain control section. The sensor is configured to be installed on a bicycle having a rotating part. The signal amplifying section amplifies an output of the sensor. The gain control section adjusts a gain of the signal amplifying section in accordance with changes in a rotational state of the rotating part. | 02-28-2013 |
| 20130093514 | POWER CONVERTER SYSTEM FOR MOBILE DEVICES - A power converter system for managing power between a power supply and a load, the system including: a first buck-boost circuit connected to the power supply; and a capacitor provided between the buck-boost circuit and the load to buffer power supply for the load. The system may include a second buck-boost circuit between the capacitor and the load. In another embodiment, a power converter system includes: a boost circuit connected to the power supply; a buck circuit connected to the load; and a capacitor provided between the boost circuit and the buck circuit to manage the supply of power to the load. | 04-18-2013 |
| 20130241643 | SYSTEMS AND METHODS FOR ADAPTIVE EQUALIZATION CONTROL FOR HIGH-SPEED WIRELINE COMMUNICATIONS - Methods and systems for conditioning wireline communications to remove intersymbol interference are provided that used adaptive equalization. The method and systems include using a digital finite state machine to control two feedback loops that adjust the gain and power of the input signal relative to a supplied reference. The eye height of the input signal is conditioned by a gain feedback loop so that signal equalization can be performed in a known state. The digital finite state machine allows the loops to be flexibly run in sequence or concurrently. The adaptation functions can be shut off when adequate signal equalization has been achieve, thus saving power. | 09-19-2013 |
| 20140055198 | GAIN ADJUSTMENT DEVICE AND GAIN ADJUSTMENT METHOD FOR WIRELESS COMMUNICATION CIRCUIT FOR WIRELESS COMMUNICATION CIRCUIT - A gain adjustment device for a wireless communication circuit comprising a transmission circuit and a reception circuit includes a signal generator and a gain adjustment circuit. The signal generator is coupled to the transmission circuit, and arranged for generating a test signal to the transmission circuit. The test signal transmitted through a printed circuit board such that the reception circuit coupled to the transmission circuit generates a corresponding reception signal in response to the test signal. The gain adjustment circuit is coupled to the reception circuit and the transmission circuit, and arranged for adjusting a transmitter gain configuration and a receiver gain configuration of the wireless communication circuit according to the reception signal. | 02-27-2014 |
| 20140118065 | Linearization Circuits And Methods For Multilevel Power Amplifier Systems - Circuits and methods for achieving high linearity, high efficiency power amplifiers, including digital predistortion (DPD) and pulse cancellation in switched-state RF power amplifier systems are described. | 05-01-2014 |
| 20140125409 | AMPLIFIER CALIBRATION - A system and method of calibrating an amplifier are presented. The amplifier has a first amplification path and a second amplification path. A first state of the amplifier is identified defining a first phase shift of the first path and a second phase shift of the second path resulting in a maximum efficiency of the amplifier when an attenuation of the first path and an attenuation of the second path are set to first attenuation values. The attenuation of the first path and the attenuation of the second path is set to achieve a maximum efficiency of the amplifier when the phase shift of the first path and the phase shift of the second path are set according to the first state. | 05-08-2014 |
| 20140218106 | Power Amplifier Power Controller - A power amplifier power controller in the power amplifier system monitors various operating conditions of the power amplifier, and controls the output transmit power of the power amplifier by coordinated control of both the input drive level to the power amplifier and the gain of the power amplifier. The power amplifier power controller controls the input drive level to the power amplifier so that the input drive level does not change substantially while adjusting the gain of the power amplifier to maximize the transmit power. The power amplifier power controller may also adjust the input drive level by some portion of the overall change required to the power of the power amplifier, while adjusting the gain of the power amplifier by the remaining portion of such overall change. | 08-07-2014 |
