High speed AGC circuit

Details High speed AGC circuit High speed AGC circuit

1982-09-27

1985-12-24

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330110, 330279, H03G 320

Patent

active

045609497

ABSTRACT:
An automatic gain control circuit is disclosed which enables the control of feedback gain to stabilize the circuit and increase its speed of operation. The AGC circuit includes an operational amplifier having a varactor diode coupled between one input and an output. The circuit is used to provide a feedback control signal in response to an output signal such that the varactor diode reduces loop gain when the output signal would otherwise cause an increase in gain and drive the feedback loop to instability, and increases loop gain when the output signal would otherwise cause a decrease in loop gain and lower response time.

REFERENCES:
patent: 3613011 (1971-10-01), Wood
patent: 3671886 (1972-06-01), Fudemoto et al.
patent: 4114105 (1978-09-01), Duncan
patent: 4204172 (1980-05-01), Ben Sadou et al.
patent: 4429285 (1984-01-01), Bradshaw
Matthew Mandl, Directory of Electronic Circuits Chapter 12, "Reactance Circuits" pp. 211-212, Prentice-Hall 1978.

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