Frequency comparator with hysteresis between locked and unlocked conditions
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United States of America Patent
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Feb 22, 2005
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N/A
app pub date -
Jan 30, 2003
filing date -
Sep 5, 2001
priority date (Note) -
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Abstract
A frequency comparator apparatus used with a reference clock, a voltage controlled oscillator circuit and a phase locked loop circuit includes a reference loop circuit wherein the reference loop circuit is activated when the frequency difference between the reference clock and the voltage controlled oscillator circuit is greater than about a first threshold. Also included is a data loop circuit wherein the data loop circuit is activated when the frequency difference between the reference clock and the voltage controlled oscillator circuit is less than about a second threshold.
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