Circuits for realizing an optical isolator

Details Circuits for realizing an optical isolator Circuits for realizing an optical isolator

1989-09-13

1991-10-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

307311, G02B 2700

Patent

active

050618598

ABSTRACT:
An optical transmitter/receiver pair has an integrated CMOS circuit that provides a current flow to a pre-biased solid state light emitting device (LED) in response to the presence or absence of a digital input signal. The current flow is augmented at the rising and falling edges of the input signal to enhance turn-on and turn-off speed of the LED. The LED is optically coupled to a photodiode that produces a current flow in response to illumination. The photodiode is shielded from spurious electronic noise by a transparent shield and the output of the photodiode is amplified to produce an output voltage, which is connected to a capacitively delayed voltage divider. The voltage divider generates a time delayed threshold voltage connectable along with the output voltage to the inputs of a comparator.

REFERENCES:
patent: 3715607 (1973-02-01), Fleming
patent: 4368385 (1983-01-01), Kanbe et al.
patent: 4694157 (1987-09-01), Mishina
patent: 4719358 (1988-01-01), Matsumoto et al.
patent: 4864126 (1989-09-01), Walters et al.

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