Dynamic bias control
AssigneeEntropic Communications, Inc.
InventorsBranislav Petrovic, Michael Farese
Life of this patent
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Abstract
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.
Claims21
1-26. (canceled)
A system comprising:
- a digital envelope detector operable to generate a digital bias according to a digital signal;
- a digital-to-analog converter (DAC) operable to generate a biased analog signal according to the digital signal and the digital bias;
- a power amplifier operable to generate an amplifier output according to an amplifier input and an amplifier control;
- a high pass filter operable to attenuate an analog bias of the biased analog signal to generate the amplifier input;
- and
- a low pass filter operable to pass the analog bias of the biased analog signal to generate the amplifier control.
A method comprising:
- generating a digital bias according to an envelope of a digital signal;
- combining the digital signal with the digital bias to generate a biased digital signal;
- converting, by a digital-to-analog converter (DAC), the biased digital signal into a biased analog signal, wherein the biased analog signal comprises a high frequency analog modulated data signal and a low frequency analog envelope bias signal;
- separating the high frequency analog modulated data signal from the low frequency analog envelope bias signal;
- and
- amplifying, using a power amplifier, the high frequency analog modulated data signal by a gain determined according to the low frequency analog envelope bias signal.
Dependencies are inferred from the claim text.