Fault state detection mechanism for a ring-counter-based...

Details Fault state detection mechanism for a ring-counter-based... Fault state detection mechanism for a ring-counter-based...

2005-09-27

2005-09-27

Wambach, Margaret R. (Department: 2816)

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

Including ring counter

C377S016000, C377S028000, C377S029000, C377S122000

Reexamination Certificate

active

06950490

ABSTRACT:
A fault state detector for a ring counter is formed from unit current sources each switched under the control of a different one of the outputs of the ring counter. The currents switched in that manner are passed through a unit resistance to generate a voltage signal proportional to the number of asserted outputs from the ring counter. The voltage signal is compared to boundary reference values for valid states of the ring counter outputs and, if the voltage signal is not between the boundary reference values, a fault state is indicated.

REFERENCES:
patent: 5550528 (1996-08-01), Offord et al.
patent: 6826250 (2004-11-01), Groo

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