Patent ID: 8364101

Claim:
An amplifying device for generating a transmission signal by processing an input signal, and amplifying and transmitting the transmission signal, the amplifying device comprising: an amplifier including a first amplifying element with a drain voltage thereof being controlled, and a second amplifying element, the amplifier amplifying the transmission signal with the first and second amplifying elements, synthesizing the transmission signals amplified by the first and second amplifying elements, and outputting the synthesized transmission signal; a distortion compensator which performs a distortion operation on the input signal in accordance with a compensation coefficient, the compensation coefficient being derived from a difference between the input signal and a feedback signal generated from a portion of a signal output from the amplifier; and a controller part which controls the drain voltage of the first amplifying element in response to a result of a comparison between a power level of the input signal prior to the distortion compensation operation by the distortion compensator part, and a threshold value, wherein the controller part generates a control coefficient as a control signal to control the drain voltage, and includes a corrector part, and wherein the corrector part sets a phase of an output of the first amplifying element to be close to a phase of an output of the second amplifying element by generating a correction coefficient correcting the control coefficient so that an absolute value of the compensation coefficient generated by the distortion compensator part decreases when the power level of the input signal exceeds the threshold value.