Patent ID: 7319362

Claim:
A power amplifying apparatus that performs linear amplification by using a nonlinear power amplifier, the apparatus comprising: a signal converting section that converts an input signal of an orthogonal coordinate system to an amplitude signal and a phase signal of a polar coordinate system, then corrects the phase signal, converts the corrected phase signal to an orthogonal-coordinate phase signal of the orthogonal coordinate system, and outputs the amplitude signal and the orthogonal-coordinate phase signal; a modulating section that performs orthogonal modulation on the corrected orthogonal-coordinate phase signal, and that outputs the modulated signal to the nonlinear power amplifier; and a correcting section that outputs a gain control signal for the nonlinear power amplifier, and a phase correction signal that is used in the correction of the phase signal in the signal converting section, wherein the correcting section has a correction table that is produced on a basis of an output signal of the nonlinear power amplifier and the input signal of the orthogonal coordinate system, and outputs the gain control signal and the phase correction signal with reference to the correction table on the basis of the amplitude signal.