Fast attack automatic gain control circuit

Details Fast attack automatic gain control circuit Fast attack automatic gain control circuit

1977-08-01

1978-09-19

Dahl, Lawrence J.

Amplifiers

With semiconductor amplifying device

Including gain control means

325413, 330145, 330279, H03G 310

Patent

active

041157419

ABSTRACT:
The improved gain control circuit is comprised of an amplifier, a semiconductor device attenuator at the amplifier input, and unique control circuitry for controlling the attenuation factor of the semiconductor device. The amplifier is designed for low phase shift to minimize the time delay of its transfer function. The control circuitry responds to both positive and negative a.c. signal transitions at the amplifier output to initiate attenuator gain reduction. As with the amplifier, the control circuitry is designed for minimum response time. The combination results in an extremely fast a.g.c. attack time.

REFERENCES:
patent: 3169229 (1965-02-01), Ulzurrun
patent: 3408588 (1968-10-01), Rugo
patent: 3895310 (1975-07-01), Warren

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