Integrated photodetector with hysteresis

Details Integrated photodetector with hysteresis Integrated photodetector with hysteresis

1988-11-07

1991-05-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

307311, H01J 4014

Patent

active

050139045

ABSTRACT:
A single-chip integrated photodetector including a photodiode for detecting intensity of light and a photo-device for detecting the intensity of the light, which are connected in series, in which ON- and OFF-levels of the photo-device are determined by trigger level and holding current thereof. A current source device having hysteresis characteristics may be also connected to a photodiode, in series, instead of a photo-device to output first or second determined current values when a voltage applied from the photodiode is lower or higher than a certain voltage.

REFERENCES:
patent: 3704376 (1972-11-01), Lehovec et al.
patent: 3717770 (1973-02-01), Dyck et al.
patent: 3770967 (1973-11-01), Hanna et al.
patent: 3770968 (1973-11-01), Hession
patent: 4556789 (1985-12-01), Shotaro et al.
patent: 4658129 (1987-04-01), Fan
patent: 4745274 (1988-05-01), Muro

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