Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By presence or absence pulse detection
Patent
1993-12-10
1995-05-23
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By presence or absence pulse detection
327144, 327292, H03K 519, G01R 2315
Patent
active
054184819
ABSTRACT:
A circuit monitors electronic devices which require continuous clocking for non-destructive operation. The circuit samples a repetitive signal, such as a clock, from a device of interest (DOI). If, for whatever reason, the clock signal becomes absent, the circuit responds by deactivating the DOI. If the clock revives or becomes intermittent the circuit will not reactivate the DOI. The circuit will reactivate the DOI only upon application of an explicit reset signal. The circuit is all digital and therefore technology independent, and provides for precise control of the deactivation response time.
REFERENCES:
patent: 3725593 (1973-04-01), Palombari
patent: 4019143 (1977-04-01), Fallon et al.
patent: 4156200 (1979-05-01), Gomez
patent: 4277693 (1981-07-01), Hoekman
patent: 4374361 (1983-02-01), Holden
patent: 4446437 (1984-05-01), Rinaldi
patent: 5138636 (1992-08-01), Bardin
Rizzo Mario J.
Sikkink Mark R.
Callahan Timothy P.
Cray Research Inc.
Englund Terry L.
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