Patent ID: 8175551
Filing Date: 2012-05-08
Classification: H03F

Abstract:
1. A distortion compensation device connected to a power amplifier amplifying a high-frequency signal to compensate non-linear distortion generated in the power amplifier, the distortion compensation device having an input terminal supplied with the high-frequency signal and an output terminal supplied with a power amplifier output and comprising: a distortion detection circuit which is coupled to the output terminal and which detects a distortion signal in the power amplifier output; a distortion signal generation circuit receiving the high-frequency signal through the input terminal and generating an n-th (n is an integer of two or more) non-linear distortion signal; a distortion compensation signal generation circuit generating a distortion compensation signal by multiplying the non-linear distortion signal by a control variable, to supply the distortion compensation signal to the power amplifier; a correlation circuit which is coupled to the distortion signal generation circuit and the distortion detection circuit and which determines correlation between the n-th non-linear distortion signal and the distortion signal to produce a correlation value varied so that the distortion signal is approximated to zero; and a control variable generation circuit which is coupled to the correlation circuit and the distortion compensation signal generation circuit to supply the control variable to the distortion compensation signal generation circuit in response to the correlation value.