Log-exponential AGC circuit

Details Log-exponential AGC circuit Log-exponential AGC circuit

1974-06-06

1981-04-21

Tubbesing, T. H.

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

330279, 343 7AG, 455239, H03G 320

Patent

active

042635608

ABSTRACT:
An AGC circuit designed to have a response-time independent of the absolute ackground input level comprising a variable-gain amplifier, an envelope detector receiving an input from the variable-gain amplifier, a logarithmic amplifier to convert the envelope value to its logarithm, a summer to subtract this envelope from a reference and thus generate an error signal, an integrator to integrate the error signal, and an exponential converter to convert this signal to an exponential and apply it as a control signal to the variable-gain amplifier. Thus, a uniform echo pulse may be presented to a display regardless of the background level.

REFERENCES:
patent: 3740750 (1973-06-01), Moulton
patent: 3786506 (1974-01-01), Effinger et al.
patent: 4058809 (1977-11-01), Chudleigh, Jr.

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