Low power digital signal isolator

Details Low power digital signal isolator Low power digital signal isolator

1997-03-03

1999-11-30

Negash, Kinfe-Michael

Optical: systems and elements

Optical computing without diffraction

250551, G02F 100, H04B 1000

Patent

active

059952520

ABSTRACT:
A signal isolating device for an input digital signal has a first photo-coupler which is activated by the differential pulse produced at the leading edge of the digital signal and a second photo-coupler which is activated by the differential pulse produced at the trailing edge of the digital signal. A positive feedback system is connected in push-pull fashion with the photo-couplers for producing an output digital signal that corresponds to the input digital signal. The positive feedback system may be implemented by a buffer that includes a resistor for keeping the buffer in a stable state even when both of the photo-couplers are non-conductive.

REFERENCES:
patent: 3810034 (1974-05-01), Brunsch
patent: 4292551 (1981-09-01), Kolmann
patent: 5434694 (1995-07-01), Saito et al.

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