Patent ID: 8446980
Filing Date: 2013-05-21
Classification: H03F,H04B,H04L

Abstract:
1. A distortion compensation circuit comprising: an input level limitation unit that limits signal level of an input signal from outside to no more than a first limit value, and outputs a signal before distortion compensation; a distortion compensation unit that performs distortion compensation processing to said signal before distortion compensation based on a distortion compensation coefficient, and outputs a signal after said distortion compensation; a distortion compensation coefficient calculation unit that calculates a coefficient for compensating distortion of an output signal of an amplifier as a distortion compensation coefficient based on a difference between part of output signals of said amplifier which amplified said signal after distortion compensation and said signal before distortion compensation; a storage unit that stores said distortion compensation coefficient by correlating it to signal level of said signal before said distortion compensation, and a limit value calculation unit that calculates signal level of said signal before distortion compensation as said first limit value providing the signal level, after said distortion compensation processing based on said distortion compensation coefficient stored in said storage unit is no more than a second limit value which is a limit value of signal level of an input signal to said amplifier.