11results about "Phase feedback adaptive predistortion" patented technology

Example embodiments relate to machine learning based power amplifier digital predistortion. A device can utilize a power amplifier to amplify and transmit a signal. The signal can be received by an internal feedback receiver of the device. The device can further include a first machine learning model configured to emulate an external feedback receiver and generate an emulated feedback signal based on the internal feedback signal. The device can further include a second machine learning model configured to determine a digital predistortion parameter for the power amplifier based on the emulated feedback signal. Apparatuses, methods, and computer programs are disclosed.

Apparatus and methods for biasing power amplifiers are provided herein. In certain embodiments, a power amplifier includes a bipolar transistor having a base biased by a bias network having a reactance that controls an impedance at the transistor base to achieve substantially flat phase response over large dynamic power levels. For example, the bias network can have a frequency response, such as a high-pass or band-pass response, that reduces the impact of power level on phase distortion (AM / PM).

An adaptive digital pre-distortion device includes a legacy digital pre-distortion (DPD) device, one or more processors including processing circuitry, and a memory storing instructions. The instructions, when executed by the one or more processors individually or collectively, cause the adaptive DPD device to receive a plurality of system parameters, estimate, using a neural network, one or more coefficients of the legacy DPD device, and apply the one or more coefficients to the legacy DPD device. The neural network is configured to generate, as outputs, the one or more coefficients based on the plurality of system parameters.

An amplifier device may include a signal input configured to receive an analog signal, a signal output, and a main signal path between the signal input and the signal output. Amplifier circuitry is arranged in the main signal path. The amplifier device has signal predistortion circuitry including analog predistortion circuitry configured to generate a first predistortion signal and digital predistortion circuitry configured to generate a second predistortion signal. The signal predistortion circuitry is configured to adapt a signal in the main signal path based on the first predistortion signal and on the second predistortion signal for at least partially compensating a non-linearity of the amplifier circuitry. The analog predistortion circuitry and the digital predistortion circuitry are arranged in parallel signal paths.

An adaptive digital pre-distortion device includes a legacy digital pre-distortion (DPD) device, one or more processors including processing circuitry, and a memory storing instructions. The instructions, when executed by the one or more processors individually or collectively, cause the adaptive DPD device to receive a plurality of system parameters, estimate, using a neural network, one or more coefficients of the legacy DPD device, and apply the one or more coefficients to the legacy DPD device. The neural network is configured to generate, as outputs, the one or more coefficients based on the plurality of system parameters.

A radio-frequency (RF) circuit including: a multi-tone generation circuit configured to generate a multi-tone signal including a plurality of tones; a predistortion circuit configured to predistort the multi-tone signal or a modulation signal and output a predistortion signal; a power amplifier configured to amplify the predistortion signal and output an output signal; and a predistortion modeling circuit configured to model a predistortion model corresponding to the predistortion circuit based on the predistortion signal corresponding to the multi-tone signal and the output signal.

In some embodiments, a power amplifier circuit can include a power amplifier having an input node and an output node, and a load modulation circuit coupled to the output node of the power amplifier. The power amplifier circuit can further include a control profile configured to provide information for generating a control signal for the load modulation circuit, and a control circuit configured to generate and provide the control signal to the load modulation circuit based on the control profile. In some embodiments, the control profile can be further configured to provide information for generating a control signal for a phase compensation circuit.

An amplifier circuit is provided, comprising an amplifier, a feedback path, and an amplifier linearity enhancement circuit. The amplifier has a signal input and a signal output and is configured to generate an amplified signal at the signal output. The feedback path is coupled between the signal output and the signal input, and the amplifier linearity enhancement circuit is located in the feedback path. The amplifier linearity enhancement circuit includes a nonlinear current generator and a phase shift circuit. The nonlinear current generator is configured to provide a nonlinear current based on the amplified signal, and the phase shift circuit is configured to adjust the phase of the nonlinear current to reduce intermodulation distortion of the amplified signal.

An amplifier device (10) comprises a signal input (11) configured to receive an analog signal, a signal output (12) and a main signal path (13) between the signal input and the signal output. Amplifier circuitry (14) is arranged in the main signal path. The amplifier device further comprises signal predistortion circuitry (15). The signal predistortion circuitry comprises analog predistortion circuitry (151) configured to generate a first predistortion signal and digital predistortion circuitry (152) configured to generate a second predistortion signal. The signal predistortion circuitry is configured to adapt a signal in the main signal path based on the first predistortion signal and on the second predistortion signal for at least partially compensating a non-linearity of the amplifier circuitry. The analog predistortion circuitry (151) and the digital predistortion circuitry (152) are arranged in parallel signal paths.

An adaptive digital pre-distortion apparatus, an electronic apparatus, and an operation method of the electronic apparatus are provided. The adaptive digital pre-distortion device comprises: a legacy digital pre-distortion (DPD) device; one or more processors including processing circuitry; and a memory storing instructions. The instructions, when executed individually or collectively by the one or more processors, cause the adaptive DPD device to: receive a plurality of system parameters; estimating one or more coefficients of the legacy DPD device using a neural network; and applying the one or more coefficients to the legacy DPD device. The neural network is configured to generate the one or more coefficients as an output based on the plurality of system parameters.

Apparatuses and methods for biasing a power amplifier are provided herein. In certain embodiments, a power amplifier includes a bipolar transistor having a base biased by a bias network having a reactance that controls the impedance at the base of the transistor to achieve a substantially flat phase response over a large dynamic power level. For example, the bias network can have a frequency response, such as a high pass or band pass response, that reduces the effect of power level on phase distortion (AM / PM).