Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Patent
1994-04-28
1995-11-21
Mottola, Steven
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
330141, 4552401, H03G 330
Patent
active
054691150
ABSTRACT:
An automatic gain control (AGC) apparatus for a digital receiver is disclosed herein. The AGC apparatus includes an adjustable gain amplifier having an input port for receiving an input signal, a control port for receiving a gain control signal, and an output port for providing an output signal. The AGC apparatus further includes a measurement circuit for generating a received power signal based on the power of the output signal. A saturating integrator compares the received power signal to a reference signal and generates an gain control signal in response to a result of the comparison. The saturating integrator includes a decision circuit for enabling integration based on values of the received power signal, the reference signal, and the gain control signal. In a preferred implementation the utilization of an input limiter in conjunction with an analog to digital converter enables accommodation of an increased input signal dynamic range. Accordingly, the AGC apparatus is capable of being used in digital demodulation of FM signals. The AGC apparatus may also be employed within a dual mode receiver designed to process both FM and code division multiple access (CDMA) input signals.
REFERENCES:
patent: 4301445 (1981-11-01), Robinson
patent: 5107225 (1992-04-01), Wheatley et al.
Black Peter J.
Peterzell Paul E.
Wilson Nathaniel B.
Miller Russell B.
Mottola Steven
Ogrod Gregory D.
Qualcomm Incorporated
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