Preamplifier for optical communication having a gain control cir

Details Preamplifier for optical communication having a gain control cir Preamplifier for optical communication having a gain control cir

1993-04-22

1994-11-08

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including atomic particle or radiant energy impinging on a...

250214AG, 359194, H03F 308

Patent

active

053630645

ABSTRACT:
A phase-inverting amplifier includes an input-stage FET, a load thereof and a gain control circuit. The gain control circuit is provided in parallel with the load, and reduces an effective load resistance to lower an open-loop gain of the phase-inverting amplifier when a current flowing through the load exceeds a predetermined value. The gain control circuit is typically a FET whose gate is biased at a constant voltage. A feedback resistor is provided in a negative feedback path of the phase-inverting amplifier. A bypass circuit is provided in parallel with the feedback resistor, and reduces an effective feedback resistance when a feedback quantity exceeds a predetermined value.

REFERENCES:
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Presentation at Autumn National Conference of the Institute of Electronics, Information and Communication Engineers 1990, Yasuki Mikamura et al, B-743, Wide Dynamic Range GaAs Preamplifier IC for Lightwave Transmission.
Presentation at Autumn National conference of the Institute of Electronics, Information and Communication Engineers 1990, S. Inano et al, B-744, High Gain and Broadband GaAs Preamplifer IC's for High Speed Optical Receivers.
IEEE Journal on selected areas in communications, vol. SAC. 1 No. 3. Apr., "Consideration for Optical Receivers Design," Kinichiro Ogawa, Member IEEE. pp. 524-532.

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