High speed optocoupler detector

Details High speed optocoupler detector High speed optocoupler detector

1999-06-29

2002-04-16

Font, Frank G. (Department: 2877)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

Reexamination Certificate

active

06373045

ABSTRACT:

BACKGROUND OF THE INVENTION
In an optocoupler, a driver stage takes an input signal and converts it to an optical signal. The optical signal is then sensed by a detector stage which converts it back to an electrical signal. Ideally, the two stages (driver and detector) introduce little or no delay or distortion into the signal being coupled.
A detector stage offering high switching speed with minimal pulse width distortion and isolation would be highly desirable for an optocoupler. Such a detector can be fashioned with a detector responsive to changes in the output of a photo diode. A delay circuit retains the value of the detector output immediately preceding a change in the diode's output to provide a dynamic reference level against which the instantaneous output of the detector is compared.


REFERENCES:
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patent: 4762992 (1988-08-01), Gat et al.
patent: 5097293 (1992-03-01), Seto et al.
patent: 5670775 (1997-09-01), Abraham et al.
patent: 0 036 950 (1981-10-01), None
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Copy of Search Report for GB Appln. No. 0014701.7; date search was completed: Oct. 24, 2000.

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