Patent ID: 6724831
Filing Date: 2004-04-20
Classification: H03F,H04L

Abstract:
A pre-distortion apparatus for linearizing an input/output characteristic of a power amplifier, comprising:a differential pre-distortion unit using a differential between a pre-distortion function for linearizing an input/output characteristic of a power amplifier and a function expressed with a prescribed equation as a differential pre-distortion function and generating a differential pre-distortion signal using the differential pre-distortion function; and a combination unit combining the differential pre-distortion signal with the input signal and outputting a signal obtained by the combination as a signal after pre-distortion, wherein said differential pre-distortion unit stores a differential between the pre-distortion function and two functions y=x and y=ax+b (x: an input signal value, y: an output signal value, a and b: constants) as the differential pre-distortion, function, and generates a differential pre-distortion signal using the differential pre-distortion function against the input signal.