Wide bandwidth photoelectric converting circuit

Details Wide bandwidth photoelectric converting circuit Wide bandwidth photoelectric converting circuit

1988-08-22

1990-06-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

307311, 136293, H01J 4014

Patent

active

049356186

ABSTRACT:
A photoelectric converting circuit including a light-receiving element which produces a current signal corresponding to the amount of light incident upon it and a current-to-voltage converting circuit which converts the current signal to a voltage signal. The circuit is characterized in that the current signal is supplied to the current-to-voltage converting circuit through an active circuit which exhibits a low input impedance. In preferred embodiments, the active circuit is a common-base transistor circuit in which an emitter current is supplied to the light-receiving element and a collector voltage is outputted as an output signal.

REFERENCES:
patent: 3872329 (1975-03-01), Dodson, III
patent: 4118621 (1978-10-01), Monticelli et al.
patent: 4740686 (1988-04-01), Nusser
patent: 4745275 (1988-05-01), Osafune
patent: 4793000 (1988-12-01), Imano et al.
patent: 4797546 (1989-01-01), Berger et al.
patent: 4806748 (1989-02-01), Takami et al.
patent: 4808809 (1989-02-01), Hayakawa

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