Optical control circuit and a semiconductor device for realizing

Details Optical control circuit and a semiconductor device for realizing Optical control circuit and a semiconductor device for realizing

1988-09-21

1990-04-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

307311, G02B 2700

Patent

active

049163230

ABSTRACT:
An optical control circuit is formed by a first transistor, a first resistive element connected between control electrode and first output electrode of the first transistor. The first output electrode forms an emitter or source of the transistor, a second resistive element is connected between the control electrode and second output electrode of the first transistor. The second output electrode forms a collector or drain of the transistor and an array of photovoltaic elements is connected in parallel to the second resistive element. A second transistor has a control electrode connected to the second output electrode of the first transistor. High speed operation of the second transistor can be assured, any noise voltage applied to the control electrode of the second transistor can be effectively bypassed, and the first transistor can be simultaneously formed in a substrate of the second transistor to be integralized therewith.

REFERENCES:
patent: 4307298 (1981-12-01), El Hamamsy
patent: 4500801 (1985-02-01), Janutka
patent: 4801822 (1989-01-01), Idaka

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