Variant frequency detector circuit

Details Variant frequency detector circuit Variant frequency detector circuit

1995-09-05

1997-08-12

Callahan, Timothy P.

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

Systems

Comparing counts

327 48, H03K 906, H03K 2138

Patent

active

056573618

ABSTRACT:
A detector circuit for detecting abnormalities in the oscillation frequency of a clock signal, includes a counter and a comparator. The counter is supplied with a reference clock signal, and counts the number of pulses of the reference clock signal to output a signal indicative of the count value. In response to the clock signal, the counter clears the count value. The comparator compares the count value of the counter with a specified value stored in its register, and generates a detection signal indicating whether the frequency of the clock signal is within expected limits, based on the comparison result.

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patent: 5521952 (1996-05-01), Morishima
patent: 5528183 (1996-06-01), Maturi et al.

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