Patent ID: 8559553
Filing Date: 2013-10-15
Classification: H03F,H03G,H04B

Abstract:
1. A transmitter circuit that performs two modulation methods of a polar modulation method and a quadrature modulation method, and generates a transmission signal by a designated modulation method, the transmitter circuit comprising: a signal conversion section for, in the polar modulation method, converting input data into an amplitude-component signal and a phase-component signal, and in the quadrature modulation method, converting input data into an in-phase component signal and a quadrature component signal; a carrier wave generation section for outputting a carrier wave corresponding to the designated modulation method; a mixer section for, in the quadrature modulation method, generating a quadrature modulation signal from the carrier wave, the in-phase component signal, and the quadrature component signal; a regulator for, in the polar modulation method, outputting a supply voltage control signal in accordance with the amplitude-component signal; and a power amplifier for, in the polar modulation method, amplifying the supply voltage control signal and superimposing the resultant signal onto the carrier wave, thereby generating the transmission signal, wherein in the polar modulation method, the phase-component signal is inputted to the carrier wave generation section, and the carrier wave generation section outputs the carrier wave that has been modulated with respect to phase component, and in the quadrature modulation method, the carrier wave generation section outputs the carrier wave that is yet to be modulated.