Automatic gain control circuit

Details Automatic gain control circuit Automatic gain control circuit

1982-12-27

1985-03-05

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

307299A, H03G 310, H03K 2322

Patent

active

045033986

ABSTRACT:
An automatic gain control circuit is provided for limiting the positive and negative peaks of an input waveform. A differential pair of PNP transistors are coupled to the collector of an NPN amplifying transistor for activating a limiting means on negative peaks of the input waveform as the amplifying transistor approaches cutoff. On positive peaks, a second emitter of the amplifying transistor acts as a collector drawing electrons injected into the base from the collector. A reverse current through the emitter activates the limiting means. The limiting means is coupled to the input terminal for limiting the positive and negative peaks beyond a predetermined level.

REFERENCES:
patent: 4049975 (1977-09-01), Colaco
patent: 4409495 (1983-10-01), Enomoto et al.

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