Patent ID: 6822523
Filing Date: 2004-11-23
Classification: H03C,H03F

Abstract:
A method for operating a power modulator, the method comprising the steps of:receiving an envelope signal and outputting a square wave signal as the greater of the last K samples of the envelope signal, wherein the step of receiving the envelope signal comprises the step of receiving the envelope signal in a peak detector and outputting the greater of the last K samples of the envelope signal from the peak detector; filtering the square wave signal by outputting a sum of A0S0+A1S1+. . . +AkSk where A0, A1. . . , Ak are filter coefficients and S0, S1, . . . , Sk are samples from square-wave signal; and utilizing the filtered square wave to transform a fixed power source to a voltage that exceeds and approximates a desired power-amplifier operating voltage level.