The present disclosure provides a method for compensating an imbalance between an I path and a Q path of a receiver. The method includes: sending a cosine signal and a sine signal through a signal generator, transmitting the cosine signal and the sine signal in the I path and Q path respectively; calculating autocorrelation values of the I path and the Q path in the signal receiving direction; determining a comparison result of amplitudes of the cosine signal received by the I path and the sine signal received by the Q path according to the autocorrelation values; calculating an adjustment compensation value of an analog domain gain amplifier, and an amplitude value and a phase value in a digital domain according to the comparison result of amplitudes; and compensating and adjusting the signal according to the adjustment compensation value, the amplitude value and the phase value.

A distortion compensation apparatus executes a process including: Performing distortion compensation that compensates in advance for a nonlinear distortion occurring when a transmission signal is amplified by a power amplifier; determining whether power of the transmission signal is smaller than a predetermined threshold; holding a gain relating to the distortion compensation or a result of the distortion compensation when the power of the transmission signal is determined to be smaller than the predetermined threshold; and outputting to the power amplifier, when the power of the transmission signal is determined to be smaller than the predetermined threshold, the result of the distortion compensation, and outputting to the power amplifier, when the power of the transmission signal is determined to be equal to or greater than the predetermined threshold, a result of distortion compensation performed using the held, gain, or the held result of the distortion compensation.

The present invention relates to a Doherty combiner used in a Doherty power amplifier, the Doherty combiner comprising: a phase shift section connected to one end of a carrier amplifier so as to change a phase of an RF signal output from the carrier amplifier; a matching section connected to an output terminal of the Doherty power amplifier so as to impedance-match an output of the Doherty power amplifier; and a bandwidth improvement section connected to one end of a peaking amplifier so as to change at least one of a phase bandwidth and an amplitude bandwidth of the Doherty power amplifier.

The embodiments described herein include amplifiers that are typically used in radio frequency (RF) applications. Specifically, the amplifiers described herein include a phase distortion compensation circuit that can compensate for input impedance variations that could otherwise lead to reduced efficiency and power performance. In one specific embodiment, the phase distortion compensation circuit is used to compensate for input impedance variations in the peaking amplifiers of a Doherty amplifier. In such embodiments, the phase distortion compensation circuit can absorb the non-linear input impedances of the peaking amplifiers in a way that may facilitate improved phase maintenance between the carrier and peaking stages of the Doherty amplifier.

A compensated amplifier for use in a power converter controller. The compensated amplifier comprises a first amplifier, a second amplifier, an integrator, and an arithmetic operator. The first amplifier coupled to receive a sensed signal and a reference signal and configured to generate a first error signal in response to the sensed signal and the reference signal. The second amplifier coupled to the first amplifier and configured to generate a second error signal in response to the sensed signal and the reference signal. The integrator coupled to the first amplifier and configured to generate an integrated error signal in response to the first error signal. The arithmetic operator coupled to the integrator and to the second amplifier, wherein the arithmetic operator is configured to generate a control signal in response to the integrated error signal and the second error signal.

An amplifier device having multiple amplification paths, such as a Doherty amplifier device, may include phase slope adjustment circuitry configured to adjust the frequency-dependent slope of the phase of an input carrier signal along a carrier path of the amplifier. By adjusting the phase slope of the input carrier signal in this way, the phase difference between carrier and peaking signals at an output combining node of the amplifier may be reduced, thereby reducing output power ripple of the amplifier. The phase slope adjustment circuitry may be a constant-k bandpass filter. The phase slope adjustment circuitry may have a zero-degree insertion phase at the center frequency of the amplifier. The phase slope adjustment circuitry may be implemented using surface mount inductors and capacitors.

The present disclosure describes a method and system for linearizing an amplifier using transistor-level dynamic feedback. The method and system enables nonlinear amplifiers to exhibit linear performance using one or more of gain control elements and phase shifters in the feedback path. The disclosed method and system may also allow an amplifier to act as a pre-distorter or a frequency/gain programmable amplifier.

A transformer-based amplifier, an operating method thereof, and devices including the same are disclosed. A millimeter wave amplifier includes a first transformer positioned on an input side of the millimeter wave amplifier, a second transformer positioned on an output side of the millimeter wave amplifier, and one or more of amplification stages positioned between the first transformer and the second transformer.

Aspects of the disclosure relate to a radio frequency phase shifter. An example includes an amplification stage to produce an amplified voltage, the amplification stage having a first amplifier with a first input coupled to a first output of a hybrid coupler and a second amplifier with a complementary second input coupled to a complementary second output of the hybrid coupler. A vector modulation stage coupled to the amplification stage receives the amplified voltage and produces a modulated vector, the vector modulation stage has an in-phase section and a quadrature section to control the phase of the modulated vector in response to a phase control signal. A varactor coupled across the first input and the second input of the amplification stage adjusts the capacitance between the first input and the second input in response to a capacitance control signal.

The present disclosure describes a method and system for linearizing an amplifier using transistor-level dynamic feedback. The method and system enables nonlinear amplifiers to exhibit linear performance using one or more of gain control elements and phase shifters in the feedback path. The disclosed method and system may also allow an amplifier to act as a pre-distorter or a frequency/gain programmable amplifier.