Automatic gain control

Details Automatic gain control Automatic gain control

1983-06-30

1985-07-09

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330280, H03G 320

Patent

active

045285195

ABSTRACT:
An automatic gain control circuit suitable for use in a modem receiver for receiving a modulated carrier representing data, includes a variable gain amplifier adapted to receive an input signal and coupled to an output amplifier providing the gain controlled output and also coupled to a level detector which provides a high level output signal whenever the input thereto exceeds a reference level, such output signal causing an attack operation wherein a control current generator provides an exponentially decreasing control current for an operational transconductance amplifier included in the variable gain amplifier. When the level detector output is high for more than a predetermined time a noise hit protection circuit is effective to inhibit the attack operation for a further predetermined period of time, thereby alleviating the adverse effect of a noise pulse.

REFERENCES:
patent: 3983381 (1976-09-01), Jones, Jr.
patent: 4115741 (1978-09-01), Skutta
patent: 4360787 (1982-11-01), Gaipin
"A Review of Automatic Gain Control Theory" by D. V. Mercy, published by Institution of Electronic and Radio Engineers, 99 Gower St., London WC1, England, in the Radio and Electronic Engineer, vol. 51, No. 11/12, Dec. 1981, pp. 579-590.

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