Frequency pattern detector

Details Frequency pattern detector Frequency pattern detector

2011-06-07

2011-06-07

Nguyen, Hai L (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By frequency

C327S049000

Reexamination Certificate

active

07956649

ABSTRACT:
A window sampling system and method are provided for comparing a signal with an unknown frequency to a reference clock. A pattern modulator accepts a compClk signal and supplies a test window with a period equal to n compClk periods, where n is an integer greater than 1. A pattern detector accepts the test window and a reference clock, and contrasts the test window with the reference clock. In response to failing to fit n reference clock periods inside the test window, the pattern detector supplies a frequency pattern detector output signal (fpdOut) indicating that the frequency of the compClk is greater than the reference clock frequency.

REFERENCES:
patent: 6331792 (2001-12-01), Tonietto
patent: 7532040 (2009-05-01), Kelkar et al.
patent: 7764088 (2010-07-01), Chen et al.
patent: 7786763 (2010-08-01), Bal et al.

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