Patent ID: 7577211
Filing Date: 2009-08-18
Classification: H03F

Abstract:
1. A digital predistorter adapted to receive a digital input signal and output a predistorted digital signal, the digital predistorter comprising: an input coupled to receive the digital input signal; a first signal path coupled to the input; a second signal path, coupled to the input in parallel with said first signal path, comprising a first digital predistorter circuit providing a first predistortion signal, wherein said first digital predistorter circuit comprises a detector providing a signal related to the magnitude of the digital input signal and a Look Up Table of gain error corrections indexed by said signal related to the magnitude of the digital input signal; a third signal path, coupled to the input in parallel with said first and second signal path, comprising a second digital predistorter circuit providing a polynomial based predistortion operation on the input signal and providing a second predistortion signal; and a combiner circuit which receives and combines the outputs of the first and second digital predistorter circuits with the output of the first signal path to provide a predistorted digital output signal.