Patent ID: 9219448
Filing Date: 2015-12-22
Classification: H03F,H04B

Abstract:
1. An amplifier comprising: an amplification unit; a power supply modulator determining a modulation voltage to be applied to the amplification unit according to an input signal input into the amplification unit; a first predistorter modeling a characteristic of the amplification unit and compensating for distortion in the amplification unit; a first controller controlling a parameter of the first predistorter on the basis of an input signal input into the first predistorter and an output signal from the amplification unit; a second predistorter modulating an input signal input into the power supply modulator; and a second controller controlling the second predistorter on the basis of a signal from which a radio frequency component of a drain voltage of a field effect transistor in the amplification unit has been removed and the input signal input into the power supply modulator; wherein correction is performed such that the signal from which the radio frequency component of the drain voltage of the field effect transistor is linearized.