Low impedance automatic gain control circuit

Details Low impedance automatic gain control circuit Low impedance automatic gain control circuit

1990-03-15

1991-04-30

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

250214A, 250214AG, 330308, 455619, H03F 308, H03G 330, H01J 4014

Patent

active

050122029

ABSTRACT:
An optical receiver circuit for an incoming optical signal having a variable power level includes an optical detector for receiving the optical signal and generating a current therefrom which varies with the optical signal power level. The current so generated is applied to a transimpedance amplifier. An automatic gain control (AGC) drive circuit is connected around the amplifier thereby increasing its dynamic range. The AGC drive circuit drives a FET which has one side thereof connected to the transimpedance amplifier for shunting current from the input thereof. A negative feedback circuit comprising an amplifier is connected across the FET, which comprises the resistive feedback element, thus reducing the FET resistance by a factor of 1+T, where T is the feedback circuit loop gain.

REFERENCES:
patent: 4415803 (1983-11-01), Muoi
patent: 4540952 (1985-09-01), Williams
patent: 4718119 (1988-01-01), Salzer et al.

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