Patent ID: 8233850
Filing Date: 2012-07-31
Classification: H03F,H04B

Abstract:
1. A method of amplifying a modulated input signal, the method comprising: separating a dominant low-frequency amplitude component from the modulated input signal; separating, from the modulated input signal, a residual signal from which the dominant low-frequency amplitude component has been removed, wherein the residual signal retains the phase information of the input signal, and wherein the residual signal maintains a portion of the amplitude modulation of the input signal; and providing the residual signal to an amplifier while modulating an amplifier supply voltage as a function of the dominant low-frequency amplitude component, wherein separating, from the modulated input signal, the residual signal from which the dominant low-frequency amplitude component has been removed comprises: multiplying the reciprocal of the dominant low-frequency amplitude component by the modulated input signal to produce the residual signal.