Pulse or digital communications – Receivers – Automatic gain control
Reexamination Certificate
2007-07-26
2010-11-09
Phu, Phuong (Department: 2611)
Pulse or digital communications
Receivers
Automatic gain control
C375S297000, C375S316000, C330S302000, C330S304000, C455S249100, C455S240100
Reexamination Certificate
active
07830992
ABSTRACT:
The present invention is directed to systems and methods for providing an AGC circuit for maintaining a constant output power level from an amplifier. More specifically, the AGC circuit includes a circuitry for determining whether an input signal is a QAM or a CW signal. A QAM/CW gain switch is then controlled depending upon the input signal. Depending upon the mode of the QAM/CW gain switch, the AGC circuit either attenuates the power level of the signal or bypasses the signal. The bypassed or attenuated signal is then compared to a reference signal so that the AGC circuit produces an adjusting voltage accordingly. The amplifier finally receives the adjusting voltage and attenuates the output power level of the signal.
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International Search Report—3 pgs, filed Oct. 28, 2008, Scientific-Atlanta, Inc.
Phu Phuong
Tarolli, Sundheim Covell & Tummino LLP
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