Low current drain switch interface circuit

Details Low current drain switch interface circuit Low current drain switch interface circuit

1997-01-21

2000-04-18

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327 79, H03L 700

Patent

active

060520051

ABSTRACT:
A low current drain switch interface circuit includes an input terminal (105), coupled to a first terminal (201) of a diode (115). A voltage follower circuit (211) is coupled to a second terminal (203) of the diode (115). A current source (215) is coupled between an output terminal (213) of the voltage follower circuit (211) and a power supply terminal (111). A mechanical switch (101) is coupled to the input terminal (105). The voltage follower circuit (211) outputs a voltage (119) indicative of a physical state of the mechanical switch (101).

REFERENCES:
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patent: 3867649 (1975-02-01), Cochran
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patent: 4066916 (1978-01-01), King et al.
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patent: 4580293 (1986-04-01), Reichle
patent: 4744369 (1988-05-01), Kroll
patent: 5146476 (1992-09-01), Whitehead et al.
patent: 5157282 (1992-10-01), Ong et al.
patent: 5258669 (1993-11-01), Nakashima
patent: 5432817 (1995-07-01), Hormel et al.

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