Positive feedback high gain AGC amplifier

Details Positive feedback high gain AGC amplifier Positive feedback high gain AGC amplifier

1976-05-07

1977-06-28

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

330 20, H04N 556, H03F 368

Patent

active

040329739

ABSTRACT:
An automatic gain control circuit provides a high gain signal representative of the difference in amplitude between the synchronizing pulses of a composite video signal and a predetermined reference level. A common emitter transistor provides high gain amplification of the composite video signal, the emitter of this transistor being biased at the reference level via a voltage reference source. The collector of this transistor is coupled to an emitter follower transistor whose output signal is filtered to produce the gain control signal. A controlled positive feedback signal from the emitter of the second transistor amplifier is coupled to the emitter of the first transistor amplifier, and by matching the feedback resistor to the collector bias resistor of the common emitter transistor, the emitter of this transistor is at a virtual ground thereby providing a high gain.

REFERENCES:
patent: 3691465 (1972-09-01), McFadyen
patent: 3825849 (1974-07-01), Linder

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