Automatic gain control circuit with non-negative exponential rel

Details Automatic gain control circuit with non-negative exponential rel Automatic gain control circuit with non-negative exponential rel

1980-04-07

1982-06-01

Mullins, James B.

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

330279, H03G 330

Patent

active

043330568

ABSTRACT:
An automatic gain control circuit wherein the gain progressively increases in increasingly larger magnitudes. The illustrative embodiment includes an amplifier whose gain is related by a voltage follower to the voltage on a capacitor in a feedback loop. A rectifier develops a signal representing the AGC output level which is compared against a threshold value. A current source, arranged in a further feedback loop with the capacitor and the voltage follower, increases the voltage on the capacitor as a function of that voltage. The second derivative with respect to time of such function is non-negative. To ensure that there exists a voltage on the capacitor upon which the current source can operate, a starting circuit provides a small, non-zero voltage to the capacitor.

REFERENCES:
patent: 3620631 (1971-11-01), Stopka et al.
patent: 3879674 (1975-04-01), Dragon

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