DYNAMIC BIAS CONTROL

摘要

Systems and methods for controlling a power amplifier includes combining a digital modulated data signal with a digital bias signal to generate a combined digital signal, the digital bias signal generated based on an envelope for the modulated data signal; converting, by a digital-to-analog converter, the combined digital signal into a combined analog signal, the combined analog signal comprising an analog modulated data signal and an analog envelope bias signal; and separating the analog modulated data signal and the analog bias signal onto separate signal paths, wherein the converting is performed using a single digital-to-analog converter.

主权项

1. A communication system, comprising:
a digital tuner operable to receive a radio frequency (RF) signal and operable to output a digital intermediate frequency (IF) signal; a digital combiner operable to receive the digital IF signal and operable to output a biased IF signal; a DAC operable to convert the biased IF signal into an analog IF signal; a power amplifier having a signal input, a control input and an output; a high pass filter operable to high pass filter the analog IF signal, the high pass filtered analog IF signal being coupled to the signal input of the power amplifier; and a low pass filter operable to low pass filter the analog IF signal, the low pass filtered analog IF signal being coupled to the control input of the power amplifier.