Patent ID: 8107898
Filing Date: 2012-01-31
Classification: H04B

Abstract:
1. A transmitter circuit which outputs a transmission signal by performing a polar modulation on an input signal, the transmitter circuit comprising: a signal generator that generates an amplitude signal and a phase signal based on the input signal; a signal processor that divides the phase signal into a real component and an imaginary component, and performs a signal process on each of the real component and the imaginary component; a filter that attenuates unnecessary frequency bands of a real component signal and an imaginary component signal, respectively, which are obtained as a result of the signal process performed by the signal processor; a coordinate system converter that converts an orthogonal coordinate system, which is represented by the real component signal and the imaginary component signal of which the unnecessary frequency bands have been attenuated by the filter, to a polar coordinate system, which is represented by an amplitude component signal and a phase component signal; an adder that adds the amplitude component signal provided by the coordinate system converter, to the amplitude signal generated by the signal generator; an angle modulator that angle-modulates the phase component signal provided by the coordinate system converter; and an amplitude modulator that amplitude-modulates the phase component signal which has been angle-modulated by the angle modulator, based on the amplitude signal which has the amplitude component signal added thereto and which is provided by the adder.