Photo detector input circuit

Details Photo detector input circuit Photo detector input circuit

1978-01-12

1979-11-06

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

250214R, 307221D, 307311, 307DIG1, H03K 102

Patent

active

041737237

ABSTRACT:
An improved input circuit is provided for an array of photo detectors. For each photo detector in the array, the circuit utilizes a first FET with a source for coupling to an output of a photo detector, a gate coupled to a first gate voltage, and a drain for coupling to an output circuit. The first gate voltage is provided by a feedback circuit which utilizes matched properties of adjacent FETs. In one embodiment, FETs are used in an open loop feedback circuit to reduce the input impedance seen by the photodiode at the source of the first FET. A similar objective is accomplished in another embodiment utilizing FETs in a closed loop feedback circuit. Further embodiments utilize FETs arranged as a differential amplifier with active loads to provide a low input impedance and a virtual ground at the source of the first FET.

REFERENCES:
patent: 3770967 (1973-11-01), Hanna et al.
patent: 3944849 (1976-03-01), Tasch, Jr. et al.

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