Patent ID: 7941109

Claim:
A polar modulation transmitter apparatus comprising: a polar signal generation circuit that generates, from an input signal, an amplitude component signal and a phase component signal; a phase modulated signal generation circuit that generates, from the generated phase component signal, a radio frequency phase modulated signal; a power amplifier that amplifies the generated radio frequency phase modulated signal, based on the generated amplitude component signal; a first averaging section that detects, as a first average power value, an average output power value of the power amplifier; a second averaging section that detects, as a second average power value, an average power value of the generated amplitude component signal; and a transmission power control section that determines a power estimation value in which a first residual drift component included in the first average power value is eliminated, based on a first amount of drift in the detected first average power value and a second amount of drift in the detected second average power value, and controls a transmission power based on the determined power estimation value, wherein the transmission power control section has a correlation coefficient that indicates a ratio of the first residual drift component included in the first average power value to a second residual drift component included in the second average power value, and determines the first residual drift component included in the detected first average power value, using the detected second average power value and the correlation coefficient.