Patent ID: 7761063
Filing Date: 2010-07-20
Classification: H03F,H04L

Abstract:
1. A distortion compensator capable of compensating for a nonlinear distortion component occurring in the amplification of a target signal that is generated based upon an analog orthogonal base band signal, comprising: a first band-pass filter that limits the frequency band of the analog orthogonal baseband signal input thereto; a distortion component orthogonal baseband signal generator that generates a distortion component orthogonal baseband signal corresponding to the nonlinear distortion component based upon the analog orthogonal baseband signal having passed through the first band-pass filter; an amplitude ratio moderator that moderates the amplitude of the distortion component orthogonal baseband signal so as to match the amplitude of the nonlinear distortion component with the amplitude of a signal obtained by amplifying the distortion component orthogonal baseband signal; a phase difference moderator that moderates the phase of the distortion component orthogonal baseband signal so as to allow the nonlinear distortion component and the amplified distortion component orthogonal baseband signal to cancel each other out; a distortion component synthesizer that generates the target signal by combining the analog orthogonal baseband signal and the distortion component orthogonal baseband signal having passed through the first band-pass filter; and a first switch by which control is executed as to whether or not to input the distortion component orthogonal baseband signal to the distortion component synthesizer.