Nonlinear load pre-distortion for open loop envelope tracking

摘要

An apparatus for providing envelope tracking (ET), comprising: a power amplifier (PA) load variation pre-distortion, and an open loop ET modulator operatively coupled to the PA load variation pre-distortion, wherein the PA load variation pre-distortion is configured to determine a load variation at a PA supply voltage path based on an input signal received by a PA, and generate a pre-distortion compensation signal using the load variation, and wherein the open loop ET modulator is configured to generate a PA supply voltage on the PA supply voltage path using the pre-distortion compensation signal.

主权项

1. An apparatus for providing envelope tracking (ET), comprising:
a memory; and a processor coupled to the memory, wherein the memory includes instructions that when executed by the processor cause the apparatus to perform the following:
determine a nonlinear power amplifier (PA) current load for a PA using a reference voltage signal;filter the nonlinear PA current load to obtain an error correction signal; andadd the error correction signal to the reference voltage signal to generate a pre-distortion compensation signal, wherein the reference voltage signal corresponds to an input for the PA, and wherein the error correction signal corresponds to a mismatch between the reference voltage signal and a PA supply voltage.