Patent ID: 8050637
Filing Date: 2011-11-01
Classification: H03F,H04B

Abstract:
1. A polar modulation transmitter comprising: a polar modulation section that generates an amplitude signal from a baseband orthogonal signal generated based on transmission data; an amplitude modulation section that generates an amplitude modulation signal based on the amplitude signal; a phase modulation section that generates a phase modulation signal in a wireless frequency band based on a signal having at least a phase component of the baseband orthogonal signal; an amplifier that generates transmission data in the wireless frequency band by inputting the phase modulation signal as an input high frequency signal and inputting the amplitude modulation signal as a control signal; a detection section that calculates out of band power in two frequency bands of predetermined same detuning frequencies from the center frequency of the output signal of the amplifier; and a distortion compensation processing section that includes: wherein the predistortion distortion compensation section has a steady characteristic compensation circuit for linearizing the output signal of said amplifier in a steady state based on the output signal characteristic for a control voltage value in the steady state after a predetermined control voltage is input when a predetermined input high frequency signal amplitude is input.