Amplifier with a quadrature amplitude modulation (QAM) modulated and a continuous wave automatic gain control (AGC) circuit
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United States of America Patent
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Nov 9, 2010
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app pub date -
Jul 26, 2007
filing date -
Jul 26, 2007
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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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