Entries |
Document | Title | Date |
20080265996 | Digital Hybrid Mode Power Amplifier System - A RF-digital hybrid mode power amplifier system for achieving high efficiency and high linearity in wideband communication systems is disclosed. The present invention is based on the method of adaptive digital predistortion to linearize a power amplifier in the RF domain. The power amplifier characteristics such as variation of linearity and asymmetric distortion of the amplifier output signal are monitored by the narrowband feedback path and controlled by the adaptation algorithm in a digital module. Therefore, the present invention could compensate the nonlinearities as well as memory effects of the power amplifier systems and also improve performances, in terms of power added efficiency, adjacent channel leakage ratio and peak-to-average power ratio. The present disclosure enables a power amplifier system to be field reconfigurable and support multi-modulation schemes (modulation agnostic), multi-carriers and multi-channels. As a result, the digital hybrid mode power amplifier system is particularly suitable for wireless transmission systems, such as base-stations, repeaters, and indoor signal coverage systems, where baseband I-Q signal information is not readily available. | 10-30-2008 |
20080284520 | System And Method For Power Detection In A Power Amplifier - A system for detecting power output of a power amplifier includes a first power detector configured to detect a forward power output of a power amplifier, the first power detector configured to provide a first power detector output, and a second power detector configured to receive a collector parameter signal and detect a collector parameter therefrom, the second power detector also configured to provide a second power detector output. | 11-20-2008 |
20090009255 | Unilateral feedback power amplifier and method for realizing the same - A unilateral feedback power amplifier utilizes new feedback techniques and devices to make the amplified high-frequency signal unilateral, let the output power, power gain and impedance matching simultaneously accomplish the optimal values, and enhance the stability of the system. In this feedback amplifier, a generalized multi-port feedback circuit is in shunt with the input terminal and the output terminal of the power transistor. This generalized multi-port feedback circuit receives an amplified high-frequency signal and eliminates the reverse admittance of the amplified high-frequency signal to let the admittance value of the output amplified high-frequency signal approach zero so as to be unilateral. Moreover, the generalized multi-port feedback power amplifier differs from the conventional power amplifier of cascaded architecture in that the ground terminal of the power transistor is directly connected to the system ground. Therefore, the heat-radiating problem of the power transistor can be greatly improved. | 01-08-2009 |
20090102563 | Transimpedance amplifier - The present invention solves characteristic deterioration caused by peaking and a ground inductance, and provides a transimpedance amplifier capable of achieving a higher gain and a wider band. For this purpose, the transimpedance amplifier is configured to include a feedback circuit having two or more extreme frequencies and having a filter characteristic which is flat with respect to frequencies in a frequency region not more than a smallest extreme frequency among the extreme frequencies, which is flat with respect to frequencies in a frequency region not less than a largest extreme frequency among the extreme frequencies, and which has at least one negative inclination portion with respect to frequencies in a frequency region between the smallest and largest extreme frequencies. | 04-23-2009 |
20090108940 | Amplifier - An amplifier comprises an input terminal that inputs an AC voltage signal; an amplifying unit having a transistor for amplifying the input AC voltage signal; a current detecting unit connected internally of said amplifying unit; and a control-current source controlled by said current detecting unit that drives an input stage of the transistor. | 04-30-2009 |
20090231042 | Broadband Power Amplifier with A High Power Feedback Structure - A broadband power amplifier using a novel high power feedback structure is disclosed in this patent. Feedback is widely used in amplifier design to broaden the bandwidth of the amplifier. Traditionally, the feedback resistor is either an axial resistor placed over the top of the transistor or a surface mount resistor with a long PCB trace making up the rest of the feedback path. However, each of these methods has it's limitations. The axial resistor doesn't have good heat sinking capability and therefore cannot handle high power. The feedback on PCB makes the feedback path long and becomes positive feedback at high frequency, thus limiting the high end frequency of operation of the amplifier in a stable region. The feedback structure disclosed in this patent has a good heat sinking path, has very short feedback path; allowing for higher frequency operation. We successfully applied the feedback structures to a Gallium Nitride (GaN) transistor, which is a new type of power transistor that has low parasitic capacitance and high optimum load impedance, and demonstrated an amplifier with very high output power over extraordinarily broad bandwidth. Matching networks have been optimized to improve performance and stability. We have demonstrated that unconditional stability is achievable while operating over a broad bandwidth using this feedback structure. | 09-17-2009 |
20090251219 | Amplifier Arrangement and Signal Generation Method - An amplifier arrangement includes an output amplifier stage (OA) comprising a stage input (SIN), a stage output (SOUT) which is coupled to a signal output (OUT) of the amplifier arrangement, and a capacitive element (CE) which couples the stage output (SOUT) to the stage input (SIN). A driver stage (DR) comprises a driver input (DIN) and a driver output (DOUT) which is coupled to the stage input (SIN) The driver stage (DR) is configured to generate a voltage potential at a driver output (DOUT) depending on an input current at the driver input (DIN) and to provide a charging current to the capacitive element (CE) being higher than the input current. | 10-08-2009 |
20090315624 | ACTIVE RESISTOR USED IN A FEEDBACK AMPLIFIER PARTICULARLY USEFUL FOR PROXIMITY COMMUNICATION - An active resistor and its use in a negative feedback amplifier allow wide voltage swings on the input and output signals. One embodiment includes parallel pass-gate MOS transistors of opposite conductivity types connected between the input and output nodes. Bootstrapping transistors are connected between the gates of the pass-gate transistors and respective bias voltages. Coupling capacitors are connected between the gates and the output node. Additional coupling capacitors may be connected between the gates and the input node to make the resistor symmetric. In other embodiments, only one pass-gate transistor is used. | 12-24-2009 |
20100052790 | AMPLIFIER CIRCUIT - An amplifier circuit includes a first amplifier amplifying an input signal and outputting a first amplified signal, a second amplifier amplifying the first amplified signal and outputting a second amplified signal, and a feedback circuitry feeding back the second amplified signal to the input of the second amplifier. The feedback circuitry includes a feedback transistor that keeps the input level of the second amplifier constant. | 03-04-2010 |
20100052791 | AMPLIFIER CIRCUIT - An amplifier circuit including: a multistage amplifier unit including an input-stage transistor and an output-stage transistor and configured to amplify an input signal and to output an amplified signal; and a feedback unit including a first feedback transistor, a second feedback transistor, and a feedback resistor, and configured to feed back the amplified signal to an input of the output-stage transistor in the multistage amplifier unit via the first feedback transistor, the second feedback transistor, and the feedback resistor. | 03-04-2010 |
20100148875 | CIRCUIT FOR COMPENSATION OF LEAKAGE CURRENT-INDUCED OFFSET IN A SINGLE-ENDED OP-AMP - An electronic device includes an operational amplifier, with the operational amplifier having an amplifier input stage coupled with a first output node to an amplifier output stage. A compensation capacitance is connected between an output node of the amplifier output stage and the first output node of the amplifier input stage, thereby operating as a compensator for stabilizing the operational amplifier. The compensation capacitance provides a parasitic diode drawing a first leakage current from the first output node of the amplifier input stage, a leakage current compensation circuit being coupled to the first output node of the amplifier input stage and coupled to a second output node of the amplifier input stage for drawing a first current from the first output node and a second current from the second output node. The leakage current compensation circuit is adapted such that the second current is greater than the first current by an amount corresponding to the first leakage current. | 06-17-2010 |
20100201449 | AMPLIFIER - An amplifier including a first transistor including a gate coupled to an input terminal and a grounded source; a load resistor provided between a drain of the first transistor and a power supply; an output terminal coupled to a node between the drain of the first transistor and the load resistor; a feedback path coupled to the input terminal and the output terminal and including a resistor and a capacitor; a bias voltage generator applying a gate bias voltage to the gate of the first transistor in response to an enable signal; a supply resistor provided between an output node for the gate bias voltage of the bias voltage generator and the gate of the first transistor; and an enable switch lowering a resistance value between the output node for the gate bias voltage and a node in the feedback path. | 08-12-2010 |
20100308919 | Methods and devices for leakage current reduction - Methods and devices for leakage current reduction are described. A regulator transistor is connected to a switch to bias the transistor with a first voltage during an ON state and a second voltage during the OFF state of the transistor. The switchable bias allows leakage current decrease and “on” resistance increase of the transistor. | 12-09-2010 |
20110063035 | CONTROLLED-GAIN WIDEBAND FEEDBACK LOW NOISE AMPLIFIER - Provided is controlled-gain wideband feedback low-noise amplifier. The controlled-gain wideband feedback low-noise amplifier includes: a feedback amplifier configured to isolate an input signal and an output signal obtained by amplifying the input signal, feed back the output signal to the input signal to amplify wideband input signals, resonate a low-frequency band signal among the wideband input signals to amplify the low-frequency band signal among the wideband input signals, and be switched in accordance with a control signal to control an amplification gain of the low-frequency band signal among the wideband input signals; and a cascode amplifier configured to amplify a high-frequency band signal among the wideband signals inputted from the feedback amplifier, and be switched in accordance with a control signal to control an amplification gain of the high-frequency band signal among the wideband signals. | 03-17-2011 |
20110084766 | WIDEBAND ACTIVE CIRCUIT WITH FEEDBACK STRUCTURE - A broadband active circuit with a feedback structure includes: an active load unit providing a load varied according to a control voltage; an active circuit unit connected between the active load unit and a ground and outputting a signal corresponding to a pre-set bandwidth, among input signals; and a feedback circuit unit formed between an output terminal of the active circuit unit and the active load unit and providing a signal from the output terminal of the active circuit unit to the active load unit. | 04-14-2011 |
20110156818 | METHOD OF USING INTEGRATED POWER AMPLIFIER - An output-impedance in a power amplifier is provided. A first transistor Q | 06-30-2011 |
20110169573 | AMPLIFIER CIRCUIT WITH STEP GAIN - A step gain amplifier has an amplifier with an input and an output, and a bias circuit connected to the input and to a bias node. A passive feedback circuit using only passive elements connects the output to the input. A control circuit is connected to the bias circuit at the bias node. | 07-14-2011 |
20110204979 | CONSTRUCTIVE FEEDBACK TRAVELING WAVE DEVICE AND METHOD - An apparatus and method include a transmission line carrying a propagating signal between an inlet port and an outlet port. The propagating signal can include a forward traveling wave and optionally a backward traveling wave. A feedback stage samples a the propagating signal at the outlet port, generates a feedback signal the includes a time translation and a gain translation in the feedback energy, and routes the feedback signal to the inlet port such that the gain translation constructively interferes with the forward traveling wave and thereby increases the amplitude of the forward traveling wave. | 08-25-2011 |
20110221532 | SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE AND COMMUNICATION SYSTEM - According to an embodiment, a semiconductor integrated circuit device includes an amplifier and a feedback circuit. The amplifier includes an input terminal receiving an input signal and an output terminal outputting an output signal. The feedback circuit includes a first transistor generating a bias current. The feedback circuit is configured to operate based on the bias current. The feedback circuit is configured to receive the output signal to supply a feedback signal to the input terminal. A signal having a reverse phase to the output signal is input to a gate of the first transistor. | 09-15-2011 |
20110234320 | VOLTAGE OUTPUT DEVICE HAVING AN OPERATIONAL AMPLIFIER - A voltage output device which is capable of preventing an increase in circuit scale and includes an offset compensation function that is suitably applicable in particular to a drive circuit for display devices such as liquid crystal display panels. The voltage output device includes an operational amplifier which has an inverting input terminal and a non-inverting input terminal. Resistance values of a load resistor on the inverting input side and a load resistor on the non-inverting input side are maintained when the output voltage of the amplifier has changed while sequentially varying either one or both of the resistance values of the load resistor on the inverting input side and the load resistor on the non-inverting input side in a state that the inverting input terminal and the non-inverting input terminal are connected. The voltage output device is configured to output the output voltage of the amplifier with the inverting input terminal not connected to the non-inverting input terminal. | 09-29-2011 |
20110279183 | Electronic Circuit with a Linear Amplifier Assisted by a Switch-Mode Amplifier - An electronic circuit includes a linear amplifier unit having a first current feedback loop, assisted by a switched-mode amplification unit having a second current feedback loop. The inputs of the two units are connected so that they receive, at the same time, a current setpoint in an operating mode in order to generate a fixed current across a load connected to the output of the units. The first feedback loop includes a first sensor to measure the current in the load, a first subtractor element to subtract the first measured current from the current setpoint, a first controller connected to the output of the first subtractor element and controlling a linear amplifier, which supplies the first output current to the load. The second feedback loop includes a second current sensor to measure a second current supplied to the load, between a connecting node of two switches connected in series to a supply voltage source and an inductor whose output is connected to the load. The second loop further includes a second subtractor element to subtract the second measured current from the current setpoint, a second controller connected to the output of the second subtractor element and controlling a pulse-width modulator that controls the activation of the switches to alternately connect the inductor either to the high potential or to the low potential of the supply voltage source. | 11-17-2011 |
20110291763 | LOW NOISE AMPLIFIER - A method for low noise signal amplification includes modifying a signal by way of a first amplification stage and conveying the modified signal to a second amplification stage. The method continues with comparing an output of the second amplification stage with a signal ground in a low-frequency feedback loop and changing a bias voltage for the first amplification stage as a result of the comparing step. | 12-01-2011 |
20110304399 | Driver amplifier circuit and communication system - Disclosed herein is a driver amplifier circuit, including: a first current source transistor of a first conductivity type, and a second current source transistor of the first conductivity type, control voltages being supplied to gates of the first current source transistor and the second current source transistor, respectively; a first switching transistor of the first conductivity type, and a second switching transistor of the first conductivity type; a third switching transistor of a second conductivity type, and a fourth switching transistor of the second conductivity type; first, second, third, and fourth resistor elements; and a first output node and a second output node. | 12-15-2011 |
20120007681 | METHOD AND SYSTEM FOR A FEEDBACK TRANSIMPEDANCE AMPLIFIER WITH SUB-40KHZ LOW-FREQUENCY CUTOFF - A system for a feedback transimpedance amplifier with sub-40 khz low-frequency cutoff is disclosed and may include amplifying electrical signals received via coupling capacitors utilizing a transimpedance amplifier (TIA) having feedback paths comprising source followers and feedback resistors. The feedback paths may be coupled prior to the coupling capacitors at inputs of the TIA. Voltages may be level shifted prior to the coupling capacitors to ensure stable bias conditions for the TIA. The TIA may be integrated in a CMOS chip and the source followers may comprise CMOS transistors. The TIA may receive current-mode logic or voltage signals. The electrical signals may be received from a photodetector, which may comprise a silicon germanium photodiode and may be differentially coupled to the TIA. The chip may comprise a CMOS photonics chip where optical signals for the photodetector in the CMOS photonics chip may be received via one or more optical fibers. | 01-12-2012 |
20120019325 | CURRENT-MODE AMPLIFIER - A current-mode amplifier including an input stage, a feedback circuit and an output stage is provided. The input stage has an input terminal for receiving an input current of the current-mode amplifier. The input stage generates a corresponding inner current in accordance with the input current and a feedback current. The feedback circuit is connected to the input stage. The feedback circuit generates the corresponding feedback current in accordance with the inner current of the input stage. An input terminal of the output stage is connected to an output terminal of the input stage. An output terminal of the output stage serves as an output terminal of the current-mode amplifier. | 01-26-2012 |
20120025913 | Envelope amplifier - An envelope amplifier includes an amplifier unit, a comparator unit and an output unit. The amplifier unit is made up of a first output section that outputs a first current in response to an amplitude of an input envelope signal, and a second output section. The second output section outputs a second current of a current value proportionate to a current value of the first current. Absolute value of the current value of the second current is greater than that of a current value of the first current. Comparator unit compares the current value of the first current. The output unit sums a current via an inductor derived from a current sustained or broken in response to a compared result of the comparator unit to the second current to deliver the resulting sum current at an output end. The first current is configured to be terminated without being delivered to the output unit (FIG. | 02-02-2012 |
20120025914 | CMOS POWER AMPLIFIER - A CMOS power amplifier includes: a first MOS transistor connected between a first power terminal and a first output stage and having a gate connected to an input stage; a second MOS transistor connected between the first output stage and a ground and having a gate connected to the input stage; a switching circuit unit connecting or separating a feedback line between the input stage and the first output stage to select a linear amplifying operation or a non-linear amplifying operation; and a resistor formed at the feedback line between the input stage and the first output stage to determine a linear amplification gain when the feedback line is turned on. | 02-02-2012 |
20120068771 | HETEROGENEOUS INTEGRATION OF HARMONIC LOADS AND TRANSISTOR FEEDBACK FOR IMPROVED AMPLIFIER PERFORMANCE - An RF power amplifier device in which the circuit is provided on two separate dies which are attached together vertically. According to one embodiment of the present invention, the RF power amplifier includes a first die including an amplifying circuit for amplifying an RF signal, and a second die including at least one circuit component coupled to the amplifying circuit. The first die is vertically coupled to the second die, and the second die may be a flip chip and include harmonic loads and/or feedback circuit. | 03-22-2012 |
20120105158 | Feedback Amplifier - Provided is a feedback amplifier including: an amplification circuit unit to generate an output voltage by amplifying an input voltage inputted through an input terminal; an output circuit unit to output the generated output voltage through an output terminal; a feedback circuit unit to control the gain of the amplification circuit unit by determining a total feedback resistance value using an external control signal and controlling an input current while the total feedback resistance value is determined; and a bias circuit unit to apply a bias voltage to the feedback circuit unit. | 05-03-2012 |
20120176199 | TRANSIMPEDANCE AMPLIFIER, INTEGRATED CIRCUIT AND SYSTEM - An integrated circuit according to one embodiment includes a first transimpedance amplifier and a second transimpedance amplifier. In the integrated circuit, one of the first transimpedance amplifier and the second transimpedance amplifier is set into an enabled state and the other is set into a disabled state. The first transimpedance amplifier and the second transimpedance amplifier share an input transistor. The first transimpedance amplifier has a first resistor provided between a feedback node thereof and an input node connected to the input transistor. The second transimpedance amplifier has a second resistor provided between a feedback node thereof and the first resistor. A feedback resistor of the second transimpedance amplifier is configured with a series connection of the first resistor and the second resistor. | 07-12-2012 |
20120200359 | AMPLIFIER ARRANGEMENT - An amplifier arrangement with an amplifier arrangement input and an amplifier arrangement output is disclosed. The amplifier arrangement comprises a first transistor and a first ballast resistance, wherein the first ballast resistance connects a first transistor base of the first transistor to a common base terminal at least one second transistor and at least one second ballast resistance, wherein the at least one second ballast resistance connects a second transistor base of the at least second transistor to the common base terminal; and a feedback device comprising a feedback input terminal for sensing at least a base voltage of the first transistor and further comprising a feedback output terminal that is connected to the common base terminal. | 08-09-2012 |
20120229216 | Distributed amplifier with improved stabilization - A distributed amplifier with improved stabilization includes an input transmission circuit, an output transmission circuit, at least one cascode amplifier coupled between said input and output transmission circuits. Each cascode amplifier includes a common-gate configured transistor coupled to the output transmission circuit, and a common-source configured transistor coupled between the input transmission circuit and the common-gate configured transistor. The distributed amplifier also includes a non-parasitic resistance and capacitance coupled in series between a drain and a gate of at least one of the common-gate configured transistors for increasing the amplifier stability. | 09-13-2012 |
20120268212 | Amplifier Arrangement and Method for Operating an Amplifier Arrangement - An amplifier arrangement comprising an amplifier (AMP) with a terminal (SPL) for a supply signal (VSPL) and a bias circuit (BIAS) for providing the supply signal (VSPL) at the terminal (SPL). The bias circuit holds an operating point (OP) of the amplifier (AMP) constant by means of the supply signal (VSPL). The bias circuit (BIAS) comprises a reference circuit (REF) for providing a reference signal (VREF) and a correction device (COR) by means of which the supply signal (VSPL) is regulated based on the reference signal (VREF) and a correction signal (Vfeed), the correction signal (Vfeed) being dependent on the operating point (OP) of the amplifier (AMP). A method for operating an amplifier arrangement is also described. | 10-25-2012 |
20120286874 | POSITIVE FEEDBACK COMMON GATE LOW NOISE AMPLIFIER - A Positive Feedback Common Gate Low Noise Amplifier (PFCGLNA) has positive feedback transistors and input transistors that are of the same conductivity type. Making the positive feedback and input transistors of the same conductivity type reduces sensitivity to process variations. Noise generated by the positive feedback transistors is used to cancel noise generated by the input transistors. In one embodiment, the PFCGLNA: 1) is tunable to have a substantially constant input impedance for any frequency in a wideband frequency range from 680 MHz to 980 MHz, and 2) has a noise figure less than 2.2 dB over the entire wideband frequency range. The input impedance of the PFCGLNA can be tuned to match a source that drives the PFCGLNA by setting a multi-bit digital control value supplied to a digitally-programmable tank load of the LNA. | 11-15-2012 |
20120293265 | Radio Frequency Integrated Circuit - Embodiments of the invention are concerned with configurable RFICs. In an exemplary embodiment there is provided a configurable radio-frequency integrated circuit (RFIC) including one or more configurable low noise amplifier circuits, each of said one or more configurable low noise amplifier circuits being configurable between: | 11-22-2012 |
20130009706 | ELECTRONIC DEVICE AND METHOD FOR AN AMPLIFIER WITH RESISTIVE FEEDBACK - An electronic device comprising an amplifier having at least a first input transistor of a first doping type. A first transistor is coupled with a channel as a feedback path between an output of the amplifier and a control gate of the first input transistor forming an input of the amplifier. A diode-coupled second transistor is coupled with a channel between a first current source and the output of the amplifier wherein a control gate of the first transistor is coupled between the first current source and the diode-coupled second transistor and the first transistor is of a second doping type which is opposite to the first doping type of the first input transistor of the amplifier. | 01-10-2013 |
20130057350 | Apparatus and Method for Low Noise Amplification - Embodiments provide an amplifier and a method for using and manufacturing said amplifier that incorporate an impedance matching stage, a feedback circuit, and a gain stage. The impedance matching stage is coupled to the feedback circuit wherein the feedback circuit provides a compensated operating voltage for the impedance matching stage. The output of the impedance matching stage is used to set an input bias voltage for both the impedance matching stage and the gain stage. The output of the impedance matching stage is also used, together with the output of the gain stage, to produce an output of the amplifier. | 03-07-2013 |
20130063213 | MATRIX DISTRIBUTED POWER AMPLIFIER - Disclosed is a matrix distributed amplifier (DA) having an input transmission line, an intermediate transmission line, and an output transmission line. A first plurality of amplifiers has inputs coupled to and spaced along the input transmission line and has outputs coupled to and spaced along the intermediate transmission line. A second plurality of amplifiers has inputs coupled to and spaced along the intermediate transmission line and has outputs coupled to and spaced along the output transmission line. A termination amplifier has an input coupled to the input transmission line and an output coupled to the intermediate transmission line. In at least one embodiment, a second termination amplifier has an input coupled to the intermediate transmission line and an output coupled to the output transmission line. | 03-14-2013 |
20130063214 | Quiescent Control Circuit for Providing Control Current for an Amplifier - Disclosed is a Class-AB/B amplifier comprising a first output stage including a first plurality of amplification devices and a second output stage including a second plurality of amplification devices. According to one embodiment, the first output stage operates when the Class-AB/B amplifier is in a quiescent state and the second output stage operates when the Class-AB/B amplifier is in an active state. The Class-AB/B amplifier also comprises a level shifting circuit that adjusts a control voltage of the second output stage, where the level shifting circuit is adapted to activate the second output stage when the Class-AB/B amplifier enters the active state. Embodiments of the Class-AB/B amplifier may include a level shifting circuit that implements either a fixed or signal-dependent level shift, and a quiescent control circuit that substantially eliminates any systematic offset arising from the active feedback circuit inside the replica bias circuit. | 03-14-2013 |
20130082782 | Circuit and Power Amplifier - A cascode circuit includes a first transistor and a second transistor. The first transistor and the second transistor are connected to make a cascode. In addition, the circuit has a block capacitance which is connected between a control terminal of the second transistor and a source terminal of the first transistor. In addition, the circuit has a feedback element which is connected between a drain terminal of the second transistor and a control terminal of the first transistor. | 04-04-2013 |
20130113569 | CROSS-COUPLED MULTIPATH FEEDFORWARD OPERATIONAL AMPLIFIERS - An operational amplifier can include a plurality of amplifiers connected to form a plurality of amplification paths extending from an input terminal to an output terminal of the operational amplifier. An amplifier in one of the amplification paths can include an intrinsic amplification-transistor capacitance connected between a first amplifier input and a first amplifier output, and a cross-coupling capacitor connected between the first amplifier input and a second amplifier output. A plurality of the amplification paths can include series-connected amplifiers connected in parallel with the cross-coupled amplifier. The cross-coupling capacitor can have a capacitance value selected as a function of the intrinsic capacitance and a gain experienced between the amplifier inputs and outputs. The operational amplifier can include an AC coupling capacitor connected in series with the cross-coupled amplifier. The operational amplifier can be arranged in feedback configuration. | 05-09-2013 |
20130154747 | MILLIMETER WAVE POWER AMPLIFIER - A millimeter wave power amplifier is disclosed. In an exemplary embodiment, a MM wave power amplifier (PA) includes a plurality of amplifier stages coupled together to receive a MM wave input signal and produce an amplified MM wave output signal, and one or more feedback elements coupled across the amplifier stages, each feedback element coupled across an odd number of the amplifier stages to increase an operating bandwidth of the PA. | 06-20-2013 |
20130271219 | APPARATUS AND METHODS FOR FREQUENCY COMPENSATION OF AN AMPLIFIER - Apparatus and methods for frequency compensation of an amplifier are provided. In one embodiment, an integrated circuit (IC) includes an amplifier configured to amplify an input signal to generate an output signal. The IC further includes an output pad configured to receive an output signal from the amplifier and a control pad for controlling the closed-loop bandwidth of the amplifier. A compensation capacitor is electrically connected between an input of the inverting amplification block and an output of the inverting amplification block, and a switchable capacitor is electrically connected between the input of the inverting amplification block and the control pad. The control pad can be electrically connected to a DC voltage source or to the output pad to control the amplifier's closed-loop bandwidth. | 10-17-2013 |
20130285748 | AMPLIFYING DEVICE - To effectively control the amplitude vs. power supply voltage characteristics, for example, in an ET amplifier. An amplifying device for amplifying an input signal wherein: amplifier means ( | 10-31-2013 |
20140015612 | POWER ENVELOPE CONTROLLER AND METHOD - A power envelope controller configured for use with an amplification stage and method are disclosed. The power envelope controller includes voltage feedback input circuitry configured to receive a voltage feedback signal representing an internal voltage drop across the amplification stage and current feedback input circuitry configured to receive a current feedback signal representing an output current of the amplification stage. An analog multiplier is configured to generate an internal power dissipation signal representing the internal power dissipation of the amplification stage based on the voltage and current feedback signals. A comparator circuit is configured to compare the internal power dissipation signal to a power threshold and generate a power control error signal when the internal power dissipation of the amplification stage exceeds the threshold. | 01-16-2014 |
20140028400 | SEMICONDUCTOR INTEGRATED CIRCUIT - In an integrated circuit having a feedback amplifier circuit composed of the feedback which feedbacks a part of the output signal to the input side in the first stage, a semiconductor integrated circuit of the present invention can suppress the occurrence of the data signal distortion and the gain peaking of the frequency characteristic generated by inter-stage wiring between the first stage and the latter stage. | 01-30-2014 |
20140049323 | TRANSIMPEDANCE AMPLIFIER - A method of forming a circuit includes forming a transimpedance amplifier having a first input node and a second input node. The method also includes forming a feedback circuit having a first transistor having a drain terminal connected to the first input node, a source terminal, and a gate terminal, a second transistor having a drain terminal connected to the second input node, a source terminal, and a gate terminal, and a third transistor having a drain terminal connected to the source terminal of the first transistor and the source terminal of the second terminal. | 02-20-2014 |
20140111280 | ELECTRONIC DEVICE, FIBER-OPTIC COMMUNICATION SYSTEM COMPRISING THE ELECTRONIC DEVICE AND METHOD OF OPERATING THE ELECTRONIC DEVICE - An electronic device, a fiber-optic communication system comprising the electronic device and a method of operating the electronic device are provided. The electronic device comprises a transimpedance-type amplifier having a transimpedance stage comprising an amplifier which is coupled in series with an input node. A feedback resistor is coupled in series between an output node of the amplifier and an inverting input node of the amplifier to provide a virtual ground node which is coupled to the input node, the inverting input node of the amplifier and to the feedback resistor. A current source is coupled to the virtual ground node so as to compensate for an offset current in an input signal which is coupled to the input node of the electronic device. Further, the electronic device comprises a control stage which is configured to control the current source as a function of a current through the feedback transistor. | 04-24-2014 |
20140132350 | ELECTRONIC SYSTEM, RF POWER AMPLIFIER AND TEMPERATURE COMPENSATION METHOD THEREOF - A radio frequency (RF) power amplifier is disclosed. The RF radio power amplifier includes a bias current generating unit, a first impedance unit, a second impedance unit, a third impedance unit and an output stage unit. The bias current generating unit receives a reference voltage. There is a first voltage with negative temperature coefficient between the first impedance unit and the second impedance unit, and the second unit receives a ground current. There is a second voltage between the third impedance unit and the second impedance unit, and the second voltage is a partial voltage of the first voltage. The bias current generating unit outputs a bias current with positive temperature coefficient according to the second voltage. The output stage unit receives an input current. The bias current is a sum of the input current with positive temperature coefficient and the ground current. | 05-15-2014 |
20140132351 | AMPLIFIER CIRCUIT - An amplifier circuit includes an amplifier circuit that emitter-grounds a first transistor that amplifies an input signal; and an emitter-grounded feedback circuit in which a collector of the first transistor is connected to an output line of the amplifier circuit and a base is wiring-connected only to the output line by using a resistor. | 05-15-2014 |
20140167855 | RF POWER TRANSISTOR CIRCUITS - A radio frequency (RF) power transistor circuit includes a power transistor and a decoupling circuit. The power transistor has a control electrode coupled to an input terminal for receiving an RF input signal, a first current electrode for providing an RF output signal at an output terminal, and a second current electrode coupled to a voltage reference. The decoupling circuit includes a first inductive element, a first resistor, and a first capacitor coupled together in series between the control electrode of the power transistor and the voltage reference. The decoupling circuit is for dampening a resonance at a frequency lower than an RF frequency. | 06-19-2014 |
20140184334 | Optimization Methods for Amplifier with Variable Supply Power - Optimization methods via various circuital arrangements for amplifier with variable supply power are presented. In one embodiment, a switch can be controlled to include or exclude a feedback network in a feedback path to the amplifier to adjust a response of the amplifier dependent on a region of operation of the amplifier arrangement (e.g. linear region or compression region). | 07-03-2014 |
20140184335 | Amplifiers Operating in Envelope Tracking Mode or Non-Envelope Tracking Mode - Various envelope tracking amplifiers are presented that can be switched between an ET (envelope tracking) mode and a non-ET mode. Switches and/or tunable components are utilized in constructing the envelope tracking amplifiers that can be switched between the ET mode and the non-ET mode. | 07-03-2014 |
20140253244 | POWER AMPLIFIER SPURIOUS CANCELLATION - This disclosure relates generally to power amplification devices and methods of operating the same. The power amplification devices are capable of reducing (and possibly cancelling) modulation of a ripple variation of a supply voltage level of a supply voltage onto a radio frequency (RF) signal. In one embodiment, a power amplification device includes a power amplification circuit configured to amplify an RF signal with a supply voltage such that a ripple variation in a supply voltage level of the supply voltage is modulated onto the RF signal in accordance with a conversion gain. However, the power amplification device also includes a plurality of ripple rejection circuits. The plurality of ripple rejection circuits is configured to produce phase shifts and one or more amplitude shifts in the RF signal so as to reduce the conversion gain of the power amplification circuit. | 09-11-2014 |
20140266456 | DEVICE AND METHOD FOR CONTROLLING POWER AMPLIFIER - A device for controlling operation of a power amplifier includes a detector, a reference signal generator and a controller. The detector is configured to detect a voltage level of an output signal of the power amplifier with respect to a predetermined boost threshold and to generate a corresponding detection signal and a reference signal. The controller is configured to provide a supply voltage to an output transistor of the power amplifier based on a comparison of the detection signal and the reference signal, the supply voltage being a no boost voltage, which is substantially the same as a supply voltage, when the comparison indicates that the voltage level is within the predetermined boost threshold, and the supply voltage being one of multiple boost voltages when the detection signal indicates that the voltage level is beyond the predetermined boost threshold. The controller generates the boost voltages by boosting the supply voltage. | 09-18-2014 |
20140266457 | GAIN AND PHASE CALIBRATION FOR CLOSED LOOP FEEDBACK LINEARIZED AMPLIFIERS - Embodiments of a radio frequency (RF) amplification device having an RF amplification circuit and an amplifier control circuit operably associated with the RF amplification circuit are disclosed. The RF amplification circuit is configured to amplify an RF signal in accordance with a transfer function. The amplifier control circuit includes a closed-loop linearization circuit and a calibration circuit. The closed-loop linearization circuit is configured to be activated so that the transfer function defines a closed-loop response and inactive so that the transfer function defines an open-loop response. For example, the closed-loop linearization circuit may become inactive at small-signal power levels. Accordingly, the amplifier control circuit also includes a calibration circuit configured to reduce a difference between the open-loop response and the closed-loop response of the transfer function. In this manner, the performance of the RF amplification device is maintained while the closed-loop linearization circuit is inactive. | 09-18-2014 |
20140266458 | RF REPLICATOR FOR ACCURATE MODULATED AMPLITUDE AND PHASE MEASUREMENT - The disclosure provides a communication circuit including an amplification circuit, a replicator circuit, and a correction circuit. Specifically, the amplification circuit generates an amplified signal. The replicator circuit emulates the amplification circuit and generates a replicated signal that approximates the amplified signal. The replicated signal is used by the correction circuit to generate control signals for controlling the amplification circuit. | 09-18-2014 |
20140292412 | AMPLIFIER LINEARIZATION USING PREDISTORTION - A device and method of predistortion linearization that account for both EVM and spectral mask are disclosed. The device and method are based on transforming the predistorter optimization problem from the time domain to the frequency domain, and weighting the equations according to one or more desired objectives. One objective focuses on abiding by the spectral mask, whereas another objective focuses on improving the EVM. | 10-02-2014 |
20140300420 | ANALOG FEEDBACK AMPLIFIER - An analog feedback amplifier is capable of suppressing extraneous phase fluctuations and broadening a bandwidth by preventing effects of a group delay element by using an amplitude regulator | 10-09-2014 |
20140306762 | SYSTEM AND METHOD FOR DIGITAL MEMORIZED PREDISTORTION FOR WIRELESS COMMUNICATION - A power amplifier system includes an input operable to receive an original value that reflects information to be communicated and an address data former operable to generate a digital lookup table key. The power amplifier system also includes a predistortion lookup table coupled to the address data former and a power amplifier having an output and coupled to the predistortion lookup table. The power amplifier system further includes a feedback loop providing a signal associated with the output of the power amplifier to the predistortion lookup table and a switch disposed in the feedback loop and operable to disconnect the predistortion lookup table from the output of the power amplifier. | 10-16-2014 |
20140306763 | INTEGRATED CIRCUIT WIRELESS COMMUNICATION UNIT AND METHOD FOR PROVIDING A POWER SUPPLY - An integrated circuit is described for providing a power supply to a radio frequency (RF) power amplifier (PA). The integrated circuit comprises a low-frequency power supply path comprising a switching regulator and a high-frequency power supply path arranged to regulate an output voltage of a combined power supply at an output port of the integrated circuit for coupling to a load. The combined power supply is provided by the low-frequency power supply path and high-frequency power supply path. The high-frequency power supply path comprises: an amplifier comprising a voltage feedback and arranged to drive a power supply signal on the high-frequency power supply path; and a high-frequency-path supply module arranged to provide a high frequency supply to drive the amplifier, where the high-frequency-path supply module comprises a pulse-width modulator operably coupled to the high frequency supply via a filter and arranged to provide a filtered pulse-width modulated signal to the high frequency supply. | 10-16-2014 |
20140340155 | LINEARIZATION OF HETEROGENEOUS POWER AMPLIFIER SYSTEMS - Systems and methods are provided for adaptive linearization of an amplifier system having a plurality of heterogeneous amplifier paths. An amplifier system includes a plurality of amplifier paths, each configured to provide an amplified output signal from an input signal, and a signal combiner configured to combine the amplified output signals from the plurality of amplifier paths to provide a system output, such that the system output is a non-linear function of the amplified output signals. A monitoring system is configured to sample the system output and normalize the sampled output to a signal level associated with the input signal. A signal processing component is configured to characterize the amplifier paths via an iterative adaptive linearization process, such that the system output is linear with respect to the input signal. | 11-20-2014 |
20140347132 | POWER AMPLIFIER APPARATUS, TRANSMITTER APPARATUS, AND METHOD OF CONTROLLING THE POWER AMPLIFIER APPARATUS - A power amplifier apparatus includes an amplifier configured to amplify an input signal converted into an analog signal, a distortion compensator circuitry configured to perform a pre-distortion process to an input signal at a second sampling rate higher than a first sampling rate at which the input signal is converted into an analog signal, a remover configured to remove a frequency component exceeding a frequency band corresponding to the first sampling rate from the input signal subjected to the pre-distortion process, a first rate converter configured to convert a sampling rate of the input signal from which the frequency component is removed from the second sampling rate to the first sampling rate, and a first signal converter configured to convert the input signal the sampling rate of which is converted into an analog signal at the first sampling rate to supply the input signal converted into the analog signal to the amplifier. | 11-27-2014 |
20140375388 | 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. | 12-25-2014 |
20150015339 | POWER AMPLIFIER ARCHITECTURES WITH INPUT POWER PROTECTION CIRCUITS - An RF power amplifier circuit and input power limiter circuits are disclosed. A power detector generates a voltage output proportional to a power level of an input signal. There is a directional coupler with a first port connected to a transmit signal input, a second port connected to the input matching network, and a third port connected to the power detector. A first power amplifier stage with an input is connected to the input matching network and an output is connected to the transmit signal output. A control circuit connected to the power detector generates a gain reduction signal based upon a comparison of the voltage output from the power detector to predefined voltage levels corresponding to specific power levels of the input signal. Overall gain of the RF power amplifier circuit is reduced based upon the gain reduction signal that adjusts the configurations of the circuit components. | 01-15-2015 |
20150022269 | DEVICE AND METHOD FOR CONTROLLING AN INPUT SIGNAL OF A POWER AMPLIFIER - A method for controlling an input signal of a power amplifier is provided. The method comprise applying CFR to the input signal to obtain a processed input signal; determining a minimum CFR threshold; comparing the peak power of the power amplifier and an allowable peak power; and if the peak power is below the allowable peak power, determining a final CFR threshold by increasing the minimum CFR threshold, or if the peak power is not below the allowable peak power, reducing the average output power until peak power reaches the allowable peak power. | 01-22-2015 |
20150035602 | NOISE CANCELING LOW-NOISE AMPLIFIER - A noise-canceling LNA circuit for amplifying signals at an operating frequency f in a receiver circuit is disclosed. The LNA circuit comprises a first and a second amplifier branch, each having an input terminal connected to an input terminal of the LNA circuit. The first amplifier branch comprises an output terminal for supplying an output current of the first amplifier branch and a common source or common emitter main amplifier. The main amplifier has an input transistor having a first terminal, which is a gate or base terminal, operatively connected to the input terminal of the first amplifier branch, a shunt-feedback capacitor operatively connected between the first terminal of the input transistor and a second terminal, which is a drain or collector terminal, of the input transistor, and an output capacitor operatively connected between the second terminal of the input transistor and the output terminal of the first amplifier branch. The second amplifier branch comprises an output terminal for supplying an output current of the second amplifier branch. The LNA circuit comprises circuitry for combining the output current of the first amplifier branch and the output current of the second amplifier branch, thereby generating a total output current of the LNA circuit. | 02-05-2015 |
20150035603 | FEED-FORWARD AMPLIFIER DEVICE AND METHOD THEREOF - The present application discloses a feed-forward amplifier device and the method thereof. The device comprises: a splitter for splitting an input signal into two portions; a non-linear amplifier for amplifying the input signal and producing inter-modulation products; a carrier canceling unit for generating pure inter-modulation products; a linear amplifier for amplifying the pure inter-modulation products; and a coupler for generating final output signal by counteracting the inter-modulation products with the amplified pure inter-modulation products; wherein the splitter and the carrier canceling unit are provided in digital base band. According to the present disclosure, pure inter-modulation products can be generated and adjusted more flexibly and more accurately in digital base band, and hence ideal output signal may be generated. | 02-05-2015 |
20150048889 | ULTRA-WIDEBAND LOW-NOISE AMPLIFIER CIRCUIT WITH LOW POWER CONSUMPTION - An ultra-wideband low-noise amplifier circuit with low power consumption includes a cascode amplifier circuit module and an output combining circuit module. The cascode amplifier circuit module receives an input signal, and outputs a first output signal and a second output signal. The output combining circuit module receives the first output signal and the second output signal, and applies respective phase shifts to the first output signal and the second output signal for reducing a phase difference between the first output signal and the second output signal, so as to obtain a combined output signal. | 02-19-2015 |
20150048890 | RADIO COMMUNICATION CIRCUIT AND RADIO COMMUNICATION APPARATUS - A radio communication circuit includes a power amplifier configured to amplify a signal and output the amplified signal, an envelope detector configured to extract an envelope of an input signal inputted to the power amplifier, an offset generator configured to generate an offset value for a power supply voltage to be applied to the power amplifier, based on a distortion amount in an output signal from the power amplifier, and a power supply voltage modulator configured to control the power supply voltage to be applied to the power amplifier based on the envelope extracted and the offset value generated. | 02-19-2015 |
20150054584 | CLASS AB SIGNAL GENERATION APPARATUS - A signal generation apparatus includes a digital-to-analog converter, a bias stage and a class AB output stage. The digital-to-analog converter is arranged for outputting a current as an input signal. The bias stage is coupled to the digital-to-analog converter, and is arranged for generating a bias signal according to at least the input signal. The class AB output stage is coupled to the bias stage, and is arranged for generating an output signal at an output node of the signal generation apparatus according to the bias signal, wherein the output signal includes a first signal component and a second signal component, both the first signal component and the second signal component correspond to the input signal, and there is a linear relation between the output signal and the input signal. | 02-26-2015 |
20150054585 | PRE-DISTORTION METHOD, ASSOCIATED APPARATUS AND NON-TRANSITORY MACHINE READABLE MEDIUM - A pre-distortion method includes: receiving an input data; and obtaining a pre-distortion output by inputting the input data into a pre-distortion function, wherein the pre-distortion function is determined according to a following power amplifier; and multiplying a reciprocal of a pre-distortion ratio of the output of the power amplifier to the input data by the output of the power amplifier. A pre-distortion apparatus includes a receiver, a pre-distortion unit and a gain compensating unit. The receiver is utilized for receiving an input data. The pre-distortion unit is utilized for obtaining a pre-distortion output by inputting the input data into a pre-distortion function, wherein the pre-distortion function is determined according to a following power amplifier. The gain compensating unit is utilized for multiplying a reciprocal of a pre-distortion ratio of the output of the power amplifier to the input data by the output of the power amplifier. | 02-26-2015 |
20150061773 | DIGITAL PREDISTORTION APPARATUS AND METHOD - A digital predistortion apparatus comprising: a nonlinear device; a memory effect compensator; a constant value characteristic acquirer; a cost function generator; and a coefficient updater is described. | 03-05-2015 |
20150061774 | DIGITAL PREDISTORTION SYSTEM AND METHOD WITH EXTENDED CORRECTION BANDWIDTH - The digital predistortion system and method with extended correction bandwidth includes a predistortion system that uses a two-box architecture based on the cascade of a memory polynomial followed by a memoryless predistortion function. The memoryless predistorter is identified offline and used to perform a coarse linearization which cancels out most of the static nonlinearity of the device under test allowing for a reduced observation bandwidth for the synthesis of the memory polynomial predistortion sub-function. | 03-05-2015 |
20150070092 | POWER AMPLIFIER MODULE - A power amplifier module includes a first amplification transistor that amplifies and outputs a radio frequency signal, a second amplification transistor that is connected in parallel to the first amplification transistor and that has a smaller size than the first amplification transistor, a bias circuit that supplies a bias voltage or a bias current to the first and second amplification transistors, a current detector circuit that detects a current flowing in the second amplification transistor, and a bias control circuit that controls the bias voltage or the bias current supplied from the bias circuit to the first and second amplification transistors depending on the detection result of the current detector circuit. | 03-12-2015 |
20150091650 | Amplifier with Variable Feedback Impedance - A variable feedback impedance is presented capable of providing high linearity (e.g. as represented by 1P2 and 1P3) and high linear range (e.g. as represented by P1dB) when used in a feedback path of an RF amplifier in the presence of high voltage amplitudes. | 04-02-2015 |
20150116038 | RESISTANCE MULTIPLIER - This document discusses, among other things, a resistance multiplier configured to provide a more specific and controllable resistance value, the resistance multiplier including an amplifier configured to control a resistance across a first transistor using a received reference resistance value and to control a resistance across a second transistor using the resistance across the first transistor and a relationship between the first and second transistors. | 04-30-2015 |
20150145599 | RADIO FREQUENCY SIGNAL AMPLIFYING SYSTEM - A radio frequency signal amplifying system includes an amplifier having an input terminal and an output terminal, an attenuator electrically connected to the input terminal of the amplifier, a peak power detecting module configured to apply a peak power attenuation signal to the attenuator by taking a peak power level of an input signal into consideration, and an average power detecting module configured to apply an average power attenuation signal to the attenuator by taking an average power level of an output signal from the output terminal into consideration. The attenuator is configured to generate the attenuated signal to the input terminal of the amplifier by taking the peak power attenuation signal, the average power attenuation signal, or the combination thereof into consideration. | 05-28-2015 |
20150303878 | POWER AMPLIFIERS, SYSTEMS, AND METHODS - An apparatus includes a cascode amplifier. The cascode amplifier includes a first transistor and a second transistor. The cascode amplifier is configured to receive a first bias voltage, a second bias voltage, and a signal. The cascode amplifier is also configured to amplify the signal based at least on the first bias voltage and the second bias voltage. The apparatus also includes a first feedback module and a second feedback module. The first feedback module is configured to adjust the first bias voltage based at least on the amplified signal. The second feedback module is configured to adjust the second bias voltage based at least on a voltage distribution across the first transistor and the second transistor. A system and method for maintaining cascode amplifier performance are also provided. | 10-22-2015 |
20150309520 | Maintaining the Resistor Divider Ratio During Start-Up - Circuits and methods to maintain a resistive voltage divider ratio during start-up of an electronic circuit comprising a feed-forward capacitor across a feedback resistor using a dynamic start-up circuit are disclosed as e.g. a LDO or an amplifier. In a preferred embodiment of the disclosure is applied to an LDO. Modification of the resistive voltage divider ratio caused by the feed-forward capacitor during start-up is prevented while the voltage level of a voltage access point of the voltage divider on the feed-forward capacitor is maintained. A start-up circuit comprises a start-up capacitor and a start-up comparator. | 10-29-2015 |
20150318830 | HIGH FREQUENCY AMPLIFIER AND METHOD OF COMPENSATING FOR DISTORTION - Disclosed is a high frequency amplifier which can properly compensate for distortion generated in a power amplifier even when an observation band of a feedback signal is made narrow. The high frequency amplifier includes a data correction unit that corrects transmission data through a digital pre-distortion method, and the data correction unit includes an orthogonalizer that orthogonalizes and outputs respective order components of a polynomial model for the digital pre-distortion method, and a compensator that compensates for a memory effect of the power amplifier for an output of the orthogonalizer. | 11-05-2015 |
20150326186 | HYBRID POWER MODULE - A hybrid power module for supplying a power to a power amplifier is provided. The hybrid power module includes a DC-DC converter and a linear regulator. The DC-DC converter provides a first current to the power amplifier via a first inductor according to an operating frequency and an envelope tracking signal. The linear regulator provides a second current to the power amplifier via a first capacitor according to the envelope tracking signal. A switch-mode power supply (SMPS) ripple voltage caused by the DC-DC converter is reduced by the linear regulator. | 11-12-2015 |
20150326188 | CASCODE POWER AMPLIFIER - An amplifier for amplifying signals is presented. A cascode power amplifies includes two or more adjacent cascode amplifiers and at least one remote cascode amplifier. The adjacent cascode amplifiers are lined up adjacent each other with inputs of the adjacent cascode amplifiers connected to a common input line and outputs of the of adjacent cascode amplifiers connected to a common output line. The adjacent cascode amplifiers generally operate in parallel. The remote cascode amplifier is spaced apart from the adjacent cascade amplifiers. An input transmission line connects an input of the remote cascode amplifier to the common input line. An output transmission line connects an output of the remote cascode amplifier to the common output line. Amplified outputs of the adjacent cascode amplifiers and amplified outputs of the remote cascode amplifier are power combined and summed into a coherent amplified output signal that is output on the output transmission line. | 11-12-2015 |
20150340993 | CIRCUITRY - Trans-impedance amplifier circuitry having an amplifier; a feedback resistor arranged between an output of the amplifier and an input of the amplifier; and at least one further resistor arranged physically parallel to the feedback resistor. | 11-26-2015 |
20150349717 | AMPLIFIER CIRCUIT WITH IMPROVED ACCURACY - An amplifier circuit with improved accuracy is provided that comprises a cascade of amplifier stages, a control line for controlling the amplifier stages, a feedback circuit having an input port for receiving a reference signal, and a feedback loop connecting the feedback circuit to the control line. Via the feedback circuit and the feedback loop, the large signal behavior of the amplifier stage is accurately fixed. As a result, the small signal gain of the amplifier stages has an improved accuracy as well. | 12-03-2015 |
20150381122 | MONOLITHIC TRANSISTOR CIRCUITS WITH TAPERED FEEDBACK RESISTORS, RF AMPLIFIER DEVICES, AND METHODS OF MANUFACTURE THEREOF - Embodiments of an integrated resistor may be incorporated into monolithic transistor circuits and packaged RF amplifier devices. An embodiment of an integrated resistor includes a semiconductor substrate and a resistor formed over the top surface of the semiconductor substrate from resistive material. The resistor includes at least first and second resistive sections. The first resistive section is tapered so that the first resistive section widens toward an input end of the resistor. The second resistive section is coupled in series with the first resistive section. According to a further embodiment, the second resistive section also is tapered so that the second resistive section widens toward an output end of the resistor. According to another further embodiment, a third resistive section with one or more meanders is coupled in series between the first and second resistive sections. | 12-31-2015 |
20160006398 | GROUP DELAY CALIBRATION OF RF ENVELOPE TRACKING - An RF communications system, which includes an RF power amplifier, an envelope tracking power supply, and supply control circuitry, is disclosed. The RF communications system operates in one of a normal operation mode and a calibration mode. During the calibration mode, the RF power amplifier receives and amplifies an RF input signal to provide an RF transmit signal using an envelope power supply signal, which is provided by the envelope tracking power supply. Further, the supply control circuitry controls the envelope tracking power supply to cause a sharp transition of the envelope power supply signal when a setpoint of the envelope power supply signal transitions through a setpoint threshold of the envelope power supply signal. | 01-07-2016 |
20160036387 | OUTPUT STAGE FOR CLASS AB AMPLIFIER - The invention relates to a class AB amplifier for receiving an input current and generating an amplified output current and having first and second output transistors connected to provide the output current, wherein if the input current is less than a threshold the first output transistor is enabled and the second output transistor is disabled, and if the input current exceeds a threshold the second output transistor is enabled. | 02-04-2016 |
20160056776 | SENSOR AMPLIFIER ARRANGEMENT AND METHOD OF AMPLIFYING A SENSOR SIGNAL - A sensor amplifier arrangement includes an amplifier having a signal input to receive a sensor signal and a signal output to provide an amplified sensor signal, and a feedback path that couples the signal output to the signal input and provides a feedback current that is an attenuated signal of the amplified sensor signal and is inverted with respect to the sensor signal. | 02-25-2016 |
20160118941 | AMPLICATION OF A RADIO FREQUENCY SIGNAL - Apparatus ( | 04-28-2016 |
20160118946 | DISTORTION-COMPENSATING POWER AMPLIFIER AND METHOD FOR COMPENSATING FOR DISTORTION TO AMPLIFY POWER - A distortion-compensating power amplifier compensates for nonlinear distortion in a power amplifier. The distortion-compensating power amplifier includes: a predistorter that performs pre-distortion processing, the pre-distortion processing applying an inverse characteristic of a distortion characteristic that is generated in the power amplifier to an input signal; a filter that performs band limitation on the pre-distorted input signal by using a frequency characteristic that is asymmetric with respect to a center frequency of the input signal, the filter having a filter coefficient that is a complex number; a down-sampler that down-samples the band-limited input signal; and a digital-to-analog converter that converts the down-sampled input signal from a digital signal to an analog signal. | 04-28-2016 |
20160142026 | REGULATED CASCODE (RGC)-TYPE BURST MODE OPTIC PRE-AMPLIFIER HAVING EXTENDED LINEAR INPUT RANGE - A Regulated Cascode (RGC)-type burst mode optic pre-amplifier having an extended linear input range. The burst mode optic pre-amplifier comprises an RGC-type Trans Impedance Amplifier (TIA), wherein a current path is added in the circuit of the RGC-type TIA to control a linearity state of the RGC-type TIA, and a main voltage gain is controlled in other circuit blocks after the RGC-type TIA. | 05-19-2016 |
20160156316 | ENVELOPE TRACKING SYSTEM WITH INTERNAL POWER AMPLIFIER CHARACTERIZATION | 06-02-2016 |
20160156317 | AMPLIFIER HAVING ENHANCED POWER EFFICIENCY | 06-02-2016 |
20160173030 | Method and Apparatus for Correcting Inconvenient Power Amplifier Load Characteristics in an Envelope Tracking Based System | 06-16-2016 |
20160190993 | Amplifiers Operating in Envelope Tracking Mode or Non-Envelope Tracking Mode - Various envelope tracking amplifiers are presented that can be switched between an ET (envelope tracking) mode and a non-ET mode. Switches and/or tunable components are utilized in constructing the envelope tracking amplifiers that can be switched between the ET mode and the non-ET mode. | 06-30-2016 |
20160197585 | AMPLIFIER | 07-07-2016 |