Power amplifier with analog predistortion

Abstract

A power amplifier with analog predistortion is disclosed. In one aspect, a signal in the transmission chain is sampled to determine if an amplitude distortion (expansion or compression) is present. Information about the sampled signal is provided to a control circuit, which uses an analog predistortion circuit to inject a correction signal into the transmission chain so as to offset or compensate for the amplitude distortion. In an exemplary aspect, the analog predistortion circuit adjusts a bias signal provided to the power amplifier. This detection and adjustment may be done in the front end of the transmission chain so as to avoid reliance on a baseband processor. Use of such analog predistortion helps maintain desired linear operation over the large bandwidths of emerging wireless communication standards.

Dependencies are inferred from the claim text.