Circuits for realizing an optical isolator
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United States of America Patent
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-
Oct 29, 1991
Grant Date -
N/A
app pub date -
Sep 13, 1989
filing date -
Sep 13, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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