Patent ID: 8938027
Filing Date: 2015-01-20
Classification: H03C,H03F,H04B,H04L

Abstract:
1. A distortion compensation circuit comprising: a distortion compensation signal generation circuit for independently generating odd-symmetrical distortion compensation signals of respective orders of a high-frequency power amplifier which power-amplifies an input signal frequency-converted into a high-frequency band; a distortion compensation signal superposition circuit for superposing the generated odd-symmetrical distortion compensation signals of respective orders on the input signal obtained before the frequency conversion to the high frequency band; an even-symmetrical distortion compensation signal generation circuit for obtaining a difference between an amplitude of the input signal and that obtained one sample before and a difference between the input signal and that obtained one sample before, and generating an even-symmetrical amplitude distortion compensation signal and an even-symmetrical phase distortion compensation signal on the basis of the difference between the amplitude of the input signal and that obtained one sample before and the difference between the input signal and that obtained one sample before, respectively independently and independently of the odd-symmetrical distortion compensation signals; and an even-symmetrical distortion compensation signal superposition circuit for superposing the generated even-symmetrical distortion compensation signals on the input signal, odd-symmetrical distortion and even-symmetrical distortion being compensated independently.