Low power active input circuit

Details Low power active input circuit Low power active input circuit

1997-07-30

2000-03-28

Zweizig, Jeffrey

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

327514, G05F 100

Patent

active

060437030

ABSTRACT:
An active input circuit module includes a plurality of active input circuits disposed on a circuit board each circuit having an input and a return. Each active input circuit further has a constant current source having a current source input and a constant current output coupled through a current limiting resistor to an opto-coupler input and the return. A shunt resistor is coupled in parallel with the opto-coupler input.

REFERENCES:
patent: 3700934 (1972-10-01), Swain
patent: 3968472 (1976-07-01), Taylor
patent: 4025850 (1977-05-01), Spiteri
patent: 4112346 (1978-09-01), Tokunaga et al.
patent: 4347475 (1982-08-01), Ullin
patent: 4420700 (1983-12-01), Fay et al.
patent: 5539352 (1996-07-01), DuPuy

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