Invention Grant
US07830992B2 Amplifier with a quadrature amplitude modulation (QAM) modulated and a continuous wave automatic gain control (AGC) circuit
有权
具有正交幅度调制（QAM）调制和连续波自动增益控制（AGC）电路的放大器
- Patent Title: Amplifier with a quadrature amplitude modulation (QAM) modulated and a continuous wave automatic gain control (AGC) circuit
- Patent Title (中): 具有正交幅度调制（QAM）调制和连续波自动增益控制（AGC）电路的放大器
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Application No.: US11828456Application Date: 2007-07-26
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Publication No.: US07830992B2Publication Date: 2010-11-09
- Inventor: Jiening Ao
- Applicant: Jiening Ao
- Agency: Tarolli, Sundheim, Covell & Tummino LLP
- Main IPC: H04L27/08
- IPC: H04L27/08
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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