Patent ID: 7499502
Filing Date: 2009-03-03
Classification: H03F,H04L

Abstract:
1. An amplifier of carrying out polar modulation by inputting amplitude data and phase data generated respectively by coding data or signals, comprising: a phase modulator of generating a phase modulation signal from the phase data; a gain adjusting instrument of determining the output level of the phase modulation signal on the basis of a level control signal indicating the level of an amplitude modulation signal, and adjusting the level of the phase modulation signal so that the phase modulation signal has the output level; a voltage adjusting instrument of determining a DC offset value on the basis of the amplitude data and the level control signal which is used for adjustment of the level of the phase modulation signal, and generating the amplitude modulation signal to which the DC offset value is added; and an amplification device having an input terminal to which the phase modulation signal is input and a power supply terminal to which the amplitude modulation signal is input, and generating a modulation signal subjected to polar modulation using the phase modulation signal input and the amplitude modulation signal input, wherein the DC offset value is determined so that in the amplification device the relationship between the modulation signal generated and the amplitude modulation signal becomes a linear relationship at least in a part of a region of a characteristic of the amplification device.