Patent ID: 6275685
Filing Date: 2001-08-14
Classification: H03F

Abstract:
A linear power amplifier arrangement comprising a high power amplifier, a pre-distortion circuit and a feedback circuit;wherein an input is operable to receive radio frequency (RF) input signals to the arrangement and is connected to the power amplifier;wherein the feedback circuit compares a sample of the power amplifier signal output with a sample of the RF input signal to provide error signals, which error signals are employed to modify a set of look-up values;wherein the pre-distortion circuit receives a sample of the RF input signal and gain a phase error signals from the feed back circuit; andwherein the pre-distortion circuit determines gain and phase error correction signals relative to the set of look-up values and the sample of the RF input signal, which gain and phase error correction signals are applied to inputs of RF amplitude and phase modulators;which error correction signals are generated as functions of the RF input signal in such a way that the modulated delayed RF input signal on passing through the high power amplifier emerges with reduced distortion.