Patent ID: 8396432

Claim:
A transmitter circuit for outputting a transmission signal, the transmitter circuit comprising: a signal generation section for generating an amplitude signal and a phase signal; a regulator for outputting a current based on the amplitude signal; a phase modulation section for phase-modulating the phase signal, and outputting a phase-modulated constant-envelope signal; and an amplifier circuit for receiving the current that is based on the amplitude signal and supplied from the regulator, and amplifying the phase-modulated signal by using the supplied current, wherein the amplifier circuit includes a power amplifying section for amplifying the phase-modulated signal, the power amplifying section includes: a first input terminal to which the phase-modulated signal is inputted; a second input terminal to which a bias current is supplied; and a third input terminal to which a predetermined DC voltage is supplied, the current based on the amplitude signal is supplied as the bias current to the second input terminal from the regulator when the power amplifying section amplifies the phase-modulated signal, and the power amplifying section performs an amplitude modulation by varying an output depending on the bias current.