Digitized AGC amplifier with gain hysteresis circuit

Details Digitized AGC amplifier with gain hysteresis circuit Digitized AGC amplifier with gain hysteresis circuit

1976-03-30

1978-01-03

Mullins, James B.

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

H03G 320

Patent

active

040669777

ABSTRACT:
A digitized automatic gain controlled amplifier and gain hysteresis circuit is disclosed for preserving a low frequency, low level modulation at the output of an AGC amplifier while also providing for rapid correction of amplifier gain for large variations in the amplifier input signal level. The described amplifier is particularly adapted to satellite communications systems in which ionospheric changes produce rapid power fades and wherein satellite tracking is accomplished by dithering a high-gain antenna on the satellite to produce a low-frequency power amplitude control signal at the input to the AGC amplifier, which control signal is allowed to pass through to a control system while the larger input signal variations are gain-controlled out.

REFERENCES:
patent: 3464022 (1969-08-01), Locheed et al.
patent: 3757242 (1973-09-01), Law et al.
patent: 3828262 (1974-08-01), Trocqueme
patent: 3879672 (1975-04-01), Milanes
patent: 3969683 (1976-07-01), Fabricius

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