Amplifiers – Hum or noise or distortion bucking introduced into signal...
Reexamination Certificate
2007-11-27
2009-10-13
Nguyen, Khanh V (Department: 2817)
Amplifiers
Hum or noise or distortion bucking introduced into signal...
C330S285000
Reexamination Certificate
active
07602244
ABSTRACT:
A power amplifier system includes a nonlinear power amplifier that receives a predistorted input signal. A receiver receives an output signal from the power amplifier and provides an observed signal. A bias controller provides a delayed dynamic bias signal to the power amplifier wherein the bias signal delay is dynamic and is a function of the observed signal for synchronizing the predistorted input signal with the dynamic bias signal. A method is also described that alternately adjusts predistortion delays and bias signal delays as a function of observed signals.
REFERENCES:
patent: 7263135 (2007-08-01), Takabayashi et al.
patent: 7333557 (2008-02-01), Rashev et al.
Wang, Feipeng, “Design of Wide-Bandwidth Envelope-Tracking Power Amplifiers for OFDM Applications”,IEEE Transactions on Microwave Theory and Techniques, vol. 53, No. 4, (Apr. 2005), 1244-1255.
Holmes Damon G.
Rashev Peter Zahariev
Tholl David M.
van Zelm John-Peter
Nguyen Khanh V
Nortel Networks Limited
Schwegman Lundberg & Woessner, P.A.
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