公开(公告)号：US10951249B1

公开(公告)日：2021-03-16

申请号：US16830481

申请日：2020-03-26

Applicant: Xilinx, Inc.

Inventor： Hongzhi Zhao ,  Vince C Barnes ,  Xiaohan Chen ,  Hemang Parekh

IPC: H04B1/04 ,  H04W52/16

Abstract: A transmit circuit operated with time-interpolated digital pre-distortion (DPD) coefficients to improve adjacent channel power ratio (ACPR) performance during a power mode change is provided. The transmit circuit includes a DPD circuit configured to operate with a first DPD coefficient according to a first transmit power level of a transmit power amplifier of the transmit circuit. The transmit circuit further includes a DPD coefficient management engine configured to retrieve a second DPD coefficient corresponding to the second transmit power level. The transmit circuit further includes a DPD coefficient time-interpolation engine configured to compute a set of time-interpolated DPD coefficients corresponding to a set of time instants for a transient period when the transmit power amplifier is adapted to the second DPD coefficient.

公开(公告)号：US11356066B1

公开(公告)日：2022-06-07

申请号：US16903378

申请日：2020-06-17

Applicant: XILINX, INC.

Inventor： Hongzhi Zhao ,  Xiaohan Chen ,  Hemang Parekh

IPC: H04B1/04 ,  H03F1/32 ,  H04L27/36

Abstract: Described examples provide for digital communication circuits and systems that implement digital pre-distortion (DPD). In an example, a system includes a DPD circuit configured to compensate an input signal for distortions resulting from an amplifier. The DPD circuit includes an infinite impulse response (IIR) filter configured to implement a transfer function. The IIR filter includes a selection circuit configured to selectively output a selected parameter. The transfer function is based on the selected parameter.

公开(公告)号：US11251819B1

公开(公告)日：2022-02-15

申请号：US17133505

申请日：2020-12-23

Applicant: XILINX, INC.

Inventor： Hongzhi Zhao ,  Xiaohan Chen ,  Hemang Parekh ,  Vincent C. Barnes

IPC: H04B1/04

Abstract: A transmitter for a communication system comprises a digital pre-distortion (DPD) circuit configured to generate a digital intermediate signal by compensating an input signal for distortions resulting from an amplifier, and an adaptation circuitry configured to update the first parameter based on the adjustment signal, the input signal, and an output signal output by the amplifier and based on the digital intermediate signal. The DPD circuit includes an infinite impulse response filter configured to implement a transfer function based on a first parameter, and thermal tracking circuitry configured to generate an adjustment signal corresponding to a thermal change of the amplifier.