Open collector communications link

Details Open collector communications link Open collector communications link

1995-09-01

1996-12-24

Chin, Wellington

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

375257, 345168, 326 90, 370284, H04B 152

Patent

active

055878245

ABSTRACT:
A bidirectional, long-distance open collector link is constructed between a pair of spaced-apart open collector ports, with each of the ports being coupled to one input of a comparator. The other input of the comparator is responsive to a reference voltage and the comparator of the opposite port via an extended conductor. A first diode poled to pass current from the respective port is coupled between inputs of each comparator, and a second diode is coupled in the extended conductor to pass current to the opposite port. As such, when a first port goes LOW, a first comparator operatively associated with that port provides a LOW to the input of the second comparator, causing it to provide a HIGH output and also pulls the second port LOW. The HIGH from the second comparator is used to clamp the first comparator LOW as long as the port asserts a LOW.

REFERENCES:
patent: 4162371 (1979-07-01), Belforte
patent: 4797582 (1989-01-01), Nguyen et al.
patent: 4885718 (1989-12-01), Asprey et al.
patent: 5274766 (1993-12-01), Long et al.
patent: 5523703 (1996-06-01), Yamamoto et al.

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