Optical signal detection circuit with constant current sources

Details Optical signal detection circuit with constant current sources Optical signal detection circuit with constant current sources

1988-08-19

1990-02-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214A, h01J 4014

Patent

active

049048600

ABSTRACT:
An optical signal detecting circuit is configured so that its detection sensitivity for detecting an optical signal received by a light receiving element is set by selecting desired values of fixed current sources I and I' and a desired current division ratio of independent PNP multicollector transistors Q1 and Q2 and so that its optical signal detecting hysteresis range is set by selecting a desired current ratio of I and I' or a desired current division ratio of the independent PNP multicollector transistors Q1 and Q2.

REFERENCES:
patent: 3770956 (1973-11-01), Hanna et al.
patent: 3786264 (1974-01-01), Ferro et al.
patent: 4092611 (1978-05-01), Frederiksen et al.
patent: 4454416 (1984-06-01), Gontowski, Jr. et al.
patent: 4485301 (1984-11-01), Gontowski, Jr. et al.
patent: 4745274 (1988-05-01), Muro
patent: 4806748 (1989-02-01), Takami et al.

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