Clock signal fault detector

Details Clock signal fault detector Clock signal fault detector

1995-06-26

1996-10-29

Beausoliel, Jr., Robert W.

Excavating

371 571, 371 65, 371 572, G11B 2700, H03M 1300, H04L 100

Patent

active

055703828

ABSTRACT:
A clock signal hull detector includes a signal level monitor for detecting an extraordinary condition in which the clock signal to be monitored is stuck at either a high level or a low level and a turning point number monitor for detecting an extraordinary condition in which the clock signal changes its level between the high and low levels with high frequency. The outputs of the signal level monitor and the turning point number monitor are fed to a fault judgment portion, which delivers an output according to the extraordinary conditions. The output of the fault judgment portion is then fed to a counting portion at which a fault judgment signal is fed to its output when its input signal is counted to a predetermined value or above.

REFERENCES:
patent: 4144448 (1979-03-01), Pisciotta et al.
patent: 4542509 (1985-09-01), Buchanan et al.
patent: 4973962 (1990-11-01), Shimizu
patent: 5410557 (1995-04-01), Scholz
patent: 5479420 (1995-12-01), Hong et al.

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