Photo-electric conversion circuit

Details Photo-electric conversion circuit Photo-electric conversion circuit

1987-06-23

1989-02-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214C, H01V 4014

Patent

active

048067482

ABSTRACT:
A photoelectric amplifier comprising a photodiode having an anode connected to a gate of a first FET and a cathode connected to a gate of a second FET, with the second FET having a source-gate interconnection so as to be self-biasing. The photodiode cathode is connected to a high impedance feedback loop, including an output transistor, which is connected back to the photodiode anode. In a preferred embodiment, further included is a feedback circuit gain controlling transistor having a base driven by the feedback circuit and a current electrode connected to the source of the first FET.

REFERENCES:
patent: 3688302 (1972-08-01), Lampkin
patent: 3734632 (1973-05-01), Matsuda
patent: 3911268 (1975-09-01), Mori et al.
patent: 3944370 (1976-03-01), Kawasaki
patent: 4051490 (1977-09-01), Kawasaki
patent: 4106035 (1978-08-01), Kawasaki et al.
patent: 4180310 (1979-12-01), Kawasaki et al.

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