Circuit array for optical Schmitt trigger

Details Circuit array for optical Schmitt trigger Circuit array for optical Schmitt trigger

1991-03-01

1992-07-14

Howell, Janice A.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214A, 307311, H01J 4014

Patent

active

051305267

ABSTRACT:
The invention relates to a circuit array for an optical Schmitt trigger in which an optical input signal is converted into an electrical output signal by means of a light-sensitive receiver element, an amplifier stage, a Schmitt trigger stage and an output stage.
It is provided in accordance with the invention that the amplifier stage contains a transimpedance amplifier stage, a differential amplifier stage, a first reference network and a compensating element, that the Schmitt trigger stage comprises a differential amplifier stage, a second reference network and a positive-feedback network, and that the output signal is emitted at the circuit output of the output stage.

REFERENCES:
patent: 3679916 (1972-07-01), Siebers
patent: 3993569 (1976-11-01), Zinsmeyer et al.
patent: 4076977 (1978-02-01), Tsunekawa et al.
patent: 4085411 (1978-04-01), Genesi
patent: 4562362 (1985-12-01), Stenbock
patent: 4743957 (1988-05-01), Hirayama
patent: 4943713 (1990-07-01), Wilder
patent: 4945227 (1990-07-01), Jones et al.
Vanderwege, J. "Schmitt-trigger opto-coupler" in Wireless World, Marz 1984, S. 40.

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