Method and device for verifying frequency of clock signal

Details Method and device for verifying frequency of clock signal Method and device for verifying frequency of clock signal

2005-02-22

2005-02-22

Zarneke, David (Department: 2829)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

Reexamination Certificate

active

06859026

ABSTRACT:
A device for verifying frequency of a clock signal generated from a clock signal generator includes a reference signal generator, a frequency divider and a comparative detector. A reference clock signal and a reset signal are provided by the reference signal generator. The frequency divider in communication with the reference signal generator and the clock signal generator receives and frequency-divides the clock signal into a bi-level divided clock signal in response to the reset signal. Then the comparative detector in communication with the frequency divider and the reference signal generator detects a level of the bi-level divided clock signal in response to the reset signal and the reference clock signal, and verifies frequency of the clock signal according to a period deviation range Te when the bi-level divided clock signal is detected to be a first level from the first to the (p−q)th detected points but a second level at the (p+1)th detected point.

REFERENCES:
patent: 3737766 (1973-06-01), Lubarsky, Jr.
patent: 5900755 (1999-05-01), Toeppen et al.
patent: 6522122 (2003-02-01), Watanabe et al.
patent: 6528982 (2003-03-01), Yanagisawa et al.
patent: 6737852 (2004-05-01), Soma et al.

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