Thermally stabilized optical preamplifier

Details Thermally stabilized optical preamplifier Thermally stabilized optical preamplifier

1988-10-26

1989-11-21

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

330308, 250214C, H01J 4014, H03F 308

Patent

active

048824828

ABSTRACT:
A thermally stabilized optical preamplifier includes a first transimpedance amplifier which receives a photosignal current from a photodiode. The gate of a GaAs device is the input to the first transimpedance amplifier, and the drain is coupled to a source of constant current. Also coupled to the drain of the GaAs device is a common base stage, and the gain of the first transimpedance amplifier is set by a resistor coupled between the input of the first transimpedance amplifier and the output of the common base stage. A current setting resistor coupled to the output of the first transimpedance amplifier converts output voltage to current, which is summed with a compensating current in a second transimpedance amplifier. The compensating current consists of a variable current generator and a thermal current generator which compensate for the current produced by the absolute value and thermal characteristics of the gate to source voltage of the input GaAs device.

REFERENCES:
patent: 4420724 (1983-12-01), Owen
patent: 4564818 (1986-01-01), Jones
patent: 4808810 (1989-02-01), VanDoorn
Hewlett-Packard, pp. 27-29, Jan. 1985, "An Optical Receiver for 550 to 950 nm", (Michael Fleischer-Reumann, Emmerich Muller, and Gerd Koffmane).

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