Automatic gain control amplifier circuit

Details Automatic gain control amplifier circuit Automatic gain control amplifier circuit

1984-11-13

1987-01-06

LaRoche, Eugene R.

Amplifiers

With semiconductor amplifying device

Including gain control means

330280, 330279, 330129, H03G 330

Patent

active

046349979

ABSTRACT:
An automatic gain control (AGC) amplifier circuit uses a control loop comprising a digital counter (70) which controls a multiplying digital-to-analog converter (10) arranged as an attenuator of the input v to the AGC. The counter (70) is arranged to count up or down depending upon the output signal of the AGC circuit. In addition, a latency can be introduced into the control loop so that in case of most signal envelope variations, the counter is frozen to prevent output fluctuations.

REFERENCES:
patent: 4360787 (1982-11-01), Galpin
patent: 4384277 (1983-05-01), Allgood et al.
patent: 4441080 (1984-04-01), Saari
P. E. Fleischer et al, "A Single-Chip Dual-Tone and Dial-Pulse Signaling Receiver," 1982 IEEE International Solid-State Circuits Conference, Feb. 11, 1982, pp. 212-214.
J. H. Davis, "Bi-FET Op Amps Simplify AGC Threshold Design," Electronics, Apr. 21, 1981, pp. 184-185.

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