FEED-FORWARD DISTORTION COMPENSATION AMPLIFIER

PROBLEM TO BE SOLVED: To provide a feed-forward distortion compensation amplifier that executes sufficiently efficient amplification processing within the range of a standard distortion level even if an input signal is of low output. SOLUTION: The feed-forward distortion compensation amplifier includes: an adjusting unit for adjusting a gain and a phase of an input signal; a first amplifier for amplifying a signal output from the adjusting unit; a delay unit for delaying the input signal; a coupler for coupling output from the delay unit to output from the first amplifier; a first controller which detects a distortion component of the amplifier to control an operation of the adjusting unit in accordance with the distortion component; and a second controller which determines one distortion level from a plurality of distortion levels according to the magnitude of the input signal, and compares the determined distortion level with the detected distortion component of the first amplifier to control an amplification factor of the first amplifier according to the comparison results. COPYRIGHT: (C)2010,JPO&INPIT