Direct digital synthesizer phase locked loop
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United States of America Patent
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-
Dec 16, 2003
Grant Date -
Dec 5, 2002
app pub date -
Mar 1, 2002
filing date -
Mar 2, 2001
priority date (Note) -
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Abstract
Phase locked loops adapted to filter and store data indicative of the control signal applied to an oscillator permit suppression of tracking in the event of a step change in the phase difference between the reference clock signal and the feedback signal in the phase locked loop. Such phase locked loops further facilitate compensation for drift of the oscillator. Such phase locked loops are suitable for use in timing circuits of communications systems.
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