Patent ID: 6710647
Filing Date: 2004-03-23
Classification: H03F

Abstract:
A distortion compensation output control circuit, in which input electric power is amplified, output electric power of a prescribed value is output, a feedback loop is formed to perform negative feedback of a part of the output electric power and distortion occurring in the amplification of electric power is compensated, comprising:an adder for adding a value of the input electric power and a value of the part of the output electric power negatively fed back together; first gain changing means for increasing or decreasing a value of electric power output from the adder; an electric power amplifier for amplifying electric power output from the first gain changing means and outputting the output electric power of the prescribed value; second gain changing means for attenuating the output electric power output from the electric power amplifier and negatively feeding back the output electric power to the adder; a second control circuit for controlling the second gain changing means to obtain the output electric power of the prescribed value; and a first control circuit for controlling the first gain changing means to obtain a loop gain of the feedback loop, the loop gain being variable, in correspondence to a quantity of distortion associated with the prescribed value of the output electric power.