A single integrated circuit may include a signal path configured to generate an output signal from an input signal, wherein the signal path includes an amplifier configured to drive the output signal, a direct-current-to-direct-current (DC-DC) power converter having a power inductor integrated in the single integrated circuit and configured to generate a supply voltage to the amplifier from a source voltage to the DC-DC power converter, and control circuitry for controlling operation of converter switches of the DC-DC power converter in order that the supply voltage tracks at least one among the input signal and the output signal.

An amplifier circuitry includes a first amplifier, a second amplifier, a voltage generating circuitry, and a control circuitry. The first amplifier circuitry configured to amplify a first signal. The second amplifier circuitry configured to amplify a second signal which forms differential signals together with the first signal. The voltage generating circuitry configured to generate at least one of a first bias voltage to be applied to the first signal and a second bias voltage to be applied to the second signal. The control circuitry configured to control the voltage generation circuitry so as to decrease a difference between a DC component of an output of the first amplifier circuitry and a DC component of an output of the second amplifier circuitry.

An amplifier circuitry includes a first amplifier, a second amplifier, a voltage generating circuitry, and a control circuitry. The first amplifier circuitry configured to amplify a first signal. The second amplifier circuitry configured to amplify a second signal which forms differential signals together with the first signal. The voltage generating circuitry configured to generate at least one of a first bias voltage to be applied to the first signal and a second bias voltage to be applied to the second signal. The control circuitry configured to control the voltage generation circuitry so as to decrease a difference between a DC component of an output of the first amplifier circuitry and a DC component of an output of the second amplifier circuitry.

The present disclosure relates to amplifier circuitry (300) that includes a linear amplifier stage (110) that receives an input signal and outputs a first drive signal to an output node (302) and a switching amplifier stage (130) operable to output a second drive signal to the output node (302). A controller (340) is selectively operable in a first dual-amplifier mode, in which switching of the switching amplifier stage is controlled based on a current of the first drive signal, such that the current of the first drive signal does not exceed a first current threshold magnitude; and at least one other mode, in which the controller controls the switching amplifier stage such that the current of the first drive signal may exceed the first current threshold magnitude. The controller (340) selectively controls the mode of operation based on an indication (S.sub.SL) of signal level of the output signal.

A radio frequency power amplifier, a chip, and a communication terminal. The radio frequency power amplifier comprises a power amplifier circuit (5), an output matching circuit (2), a power detection circuit (3), and a bias comparison circuit (4). The output power on a main signal path is measured by the power detection circuit (3), and an equivalent voltage proportional to the output power is obtained and input to the bias comparison circuit (4); the equivalent voltage value is adjusted by means of the bias comparison circuit (4) and compared with a control voltage (1) to provide a bias voltage and/or collector voltage for the power amplifier circuit (5), thereby forming a closed-loop circuit, such that the radio frequency power amplifier can work in a stable state when gains and output power are in different power levels.

In one aspect, a power amplifier apparatus comprising a power amplifier (PA) and an adaptive controller is provided. The PA comprises at least one transistor and the adaptive controller is configured to control a bias voltage of the transistor based on a measured power efficiency of the PA and a measure output signal quality of the PA. In another aspect, a method of optimizing PA performance is provided. The PA comprises at least one transistor and the method includes initializing a bias voltage of the transistor, receiving measurements indicating a power efficiency and an output signal quality of the PA, evaluating the received measurements, calculating a new bias voltage for the transistor based on the evaluation, and applying the calculated new bias voltage to the transistor.

An output stage circuit comprising a bias voltage generator, a first amplifier circuit and a second amplifier circuit is provided. The bias voltage generator is coupled to an output terminal of the output stage circuit to generate a bias voltage according to an output voltage of the output terminal. The first amplifier circuit is coupled to the output terminal, a first power supply terminal and the bias voltage generator, receives a first pre-driving signal, a first predetermined voltage and the bias voltage, and determines whether to transmit a first voltage to serve as the output voltage. The second amplifier circuit is coupled to the output terminal, a second power supply terminal and the bias voltage generator, receives a second pre-driving signal, a second predetermined voltage and the bias voltage, and determines whether to transmit a second voltage to serve as the output voltage.

A reconfigurable amplifier configured to decrease radio frequency (RF) signal distortion and increase dynamic range is disclosed. The reconfigurable amplifier includes an amplifier having an RF signal input, an RF signal output, and a bias signal input. A distortion detection network has a detector input coupled to the RF signal output and a detector output, wherein the distortion detector network is configured to generate a detection signal that is proportional to distortion at the RF signal output. A bias controller has a detection signal input coupled to the detector output and a bias output coupled to the bias signal input. The bias controller is configured to generate a bias signal that dynamically shifts level at the bias output to reduce the distortion at the RF signal output in response to the detection signal.

The disclosed technology relates generally to semiconductor devices, and more particularly to power semiconductor devices in which effects of charge trapping are compensated. A radio frequency (RF) power transmitter system comprises a RF power semiconductor device that outputs a time-varying gain characteristic from a RF signal input waveform originating from a digital input, wherein the time-varying gain characteristic includes a gain error associated with charge-trapping events having a memory effect on the RF power semiconductor device lasting longer than 1 microsecond. The RF power transmitter system further comprises circuitry configured to apply an analog gate bias waveform to the RF power semiconductor device based on the time-varying gain characteristic to reduce the gain error.

Average power tracking (APT) systems with fast transient settling are disclosed. In certain embodiments, an APT system is used to provide a power amplifier supply voltage to a power amplifier that amplifies a radio frequency (RF) signal. The APT system controls the power amplifier supply voltage to track an average power of the RF signal, and generates a first regulated voltage based on a first average power tracking voltage level and a second regulated voltage based on a second average power tracking voltage level. The APT system includes a DC switch configured to receive the first regulated voltage and the second regulated voltage, and operable to change state to transition the power amplifier supply voltage from the first average power tracking voltage level to the second average power tracking voltage level.