Transimpedance amplifier with automatic gain control

Details Transimpedance amplifier with automatic gain control Transimpedance amplifier with automatic gain control

1999-02-23

2000-07-04

Pascal, Robert

Amplifiers

With semiconductor amplifying device

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

330110, 250214A, 359194, H03F 308, H03F 136, H01J 4014, H04B 1006

Patent

active

060844787

ABSTRACT:
A transimpedance amplifier in an optical communication system is provided with automatic gain control (AGC) for increasing the input operating range while maintaining high stability. A photodetector is used to convert an optical signal into a differential current for the transimpedance amplifier. An AGC circuit has a gain control device connected across the differential input of the transimpedance amplifier. The gain control device has an impedance that varies as a function of a voltage at the differential output of the transimpedance. Preferably, the gain control device is a FET having a drain coupled to one of the differential inputs, a source coupled to the other differential input, and a gate for receiving an AGC voltage, the AGC voltage being a function of the voltage at the differential output.

REFERENCES:
patent: 4565974 (1986-01-01), Smoot
patent: 5343160 (1994-08-01), Taylor
patent: 5548833 (1996-08-01), Townsend
patent: 5589881 (1996-12-01), Dunham et al.
patent: 5864416 (1999-01-01), Williams

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