Metastable detector

Details Metastable detector Metastable detector

1979-05-14

1981-08-04

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307354, 307355, 307360, 307291, H03K 5153, H03K 524, H03K 19003

Patent

active

042824893

ABSTRACT:
A metastable arbiter circuit for determining the state of a monitored flip-flop contains an additional flip-flop that is provided on the same semiconductor chip as the operating flip-flop, the metastable condition of which is to be monitored. This additional flip-flop is hardwired in the SET state, so that its high and low outputs can be referenced to indicate when a defined state condition has been achieved in the operating flip-flop. The Q and Q outputs of the second flip-flop from which a pair of reference voltages are derived are applied to a pair of comparators, one comparator being used for negative referencing, the other for positive referencing. Through this circuit combination, there is achieved both level detection and hysteresis to produce a high true output when the complementary outputs of the operating flip-flop have reached a defined stable state.

REFERENCES:
patent: 3515998 (1970-06-01), Adams et al.
patent: 3612907 (1971-10-01), Braunholtz
patent: 3764920 (1973-10-01), Galcik et al.
patent: 3787735 (1974-01-01), DeWitte et al.
patent: 3824409 (1974-07-01), Patil
patent: 3971960 (1976-07-01), Means et al.
patent: 4093878 (1978-06-01), Paschal et al.
patent: 4149160 (1979-04-01), Bozarth et al.

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