Frequency deviation detection circuit

Details Frequency deviation detection circuit Frequency deviation detection circuit

1996-05-31

1998-08-18

Wambach, Margaret Rose

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By frequency

327 42, 327 43, 327144, 327151, 327292, H03D 1300

Patent

active

057962723

ABSTRACT:
A frequency departure detecting circuit permits flexibly modify a detecting condition of frequency departure. A working reference clock is counted for a given period. On the basis of uniformity between bits of given number of upper bits of the counted value, large magnitude of frequency departure of repeated frequency of the reference clock from a frequency that should be is judged. Also, through comparison of given number of lower bits of the counted value and externally set detecting value, departure of the repeated frequency of the reference clock from the frequency that should be, is judged. When the counted value reaches a predetermined value, free running condition of the counter is judged to stop counting operation. When judgement is made that the repeated frequency of the reference clock is departed from the frequency that should be, the working reference clock is replaced with a back-up reference clock in response to an alarm.

REFERENCES:
patent: 5369311 (1994-11-01), Wang et al.
patent: 5381416 (1995-01-01), Vartti et al.
patent: 5578938 (1996-11-01), Kazami
patent: 5610561 (1997-03-01), Zarrabian

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