Patent ID: 7973601
Filing Date: 2011-07-05
Classification: H03F

Abstract:
1. A distortion compensation apparatus for compensating a distortion characteristic of an amplifier amplifying signals, comprising: a distortion compensation coefficient update unit configured to store a distortion compensation coefficient to compensate the distortion characteristic of the amplifier, configured to calculate the distortion compensation coefficient to compensate the distortion character of the amplifier based on a signal before input to the amplifier and a feedback signal of a signal output from the amplifier, and configured to update the stored distortion compensation coefficient to the calculated distortion compensation coefficient; a distortion compensation unit configured to perform distortion compensation processing of the signal before input to the amplifier by using the updated distortion compensation coefficient; a delay unit into which the signal before input to the amplifier is input, configured to delay the signal by a set delay time, to output the delayed signal to the distortion compensation coefficient update unit; and a delay controller configured to control the set delay time to be set in the delay unit based on a phase of a complex number having a power component of the signal before input to the amplifier as a real part, and a power component of the feedback signal as an imaginary part.