Dynamic bias control
First Claim
Patent Images
1. A communication system, comprising:
- a digital tuner operable to receive an unmodulated signal and operable to output a digital radio frequency (RF) signal;
a digital combiner operable to receive the digital RF signal and operable to output a biased RF signal;
a digital to analog converter (DAC) operable to convert the biased RF signal into an analog RF 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 RF signal, the high pass filtered analog RF signal being coupled to the signal input of the power amplifier; and
a low pass filter operable to low pass filter the analog RF signal, the low pass filtered analog RF signal being coupled to the control input of the power amplifier.
4 Assignments
0 Petitions
Accused Products
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.
13 Citations
19 Claims
-
1. A communication system, comprising:
-
a digital tuner operable to receive an unmodulated signal and operable to output a digital radio frequency (RF) signal; a digital combiner operable to receive the digital RF signal and operable to output a biased RF signal; a digital to analog converter (DAC) operable to convert the biased RF signal into an analog RF 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 RF signal, the high pass filtered analog RF signal being coupled to the signal input of the power amplifier; and a low pass filter operable to low pass filter the analog RF signal, the low pass filtered analog RF signal being coupled to the control input of the power amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A method for controlling a power amplifier, comprising:
-
combining a digital RF signal, generated from an unmodulated signal by a digital tuner, with a digital bias signal to generate a biased digital RF signal, the digital bias signal being generated according to an envelope of the digital RF signal; converting, by a digital-to-analog converter, the biased digital RF signal into an analog RF signal, the analog RF signal comprising 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 using the power amplifier to amplify the high frequency analog modulated data signal by a gain determined according to the low frequency analog envelope bias signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
-
Specification