Frequency monitor and error detector circuit

Details Frequency monitor and error detector circuit Frequency monitor and error detector circuit

1995-04-12

1996-03-05

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By frequency

327 47, 327 7, 331DIG2, G01R 2302

Patent

active

054971101

ABSTRACT:
A frequency monitor and error detector circuit that processes an input ac signal to be monitored, comparing the input ac signal with an internally generated reference center frequency, and outputting a "Go/No-Go" signal indicating whether the monitored ac signal frequency is within a pre-selected tolerance band or is out of tolerance. The reference frequency is provided by a highly accurate crystal oscillator. An adjustable delay circuit is provided, capable of being adjusted to produce a frequency tolerance band of from +/-0.05% to 0.1% of the center frequency. The device has three output signals which may be logic high or logic low, and are used for activating illuminated indicators or as frequency signal inputs to other equipment. The device is small in size, accurate and reliable over a wide range of frequencies.

REFERENCES:
patent: 4451794 (1984-05-01), Yamada
patent: 4940952 (1990-06-01), Kegasa
patent: 5008635 (1991-04-01), Hanke et al.
patent: 5315186 (1994-05-01), Baker

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