Phase locked loop
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United States of America Patent
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May 13, 2014
Grant Date -
Dec 2, 2010
app pub date -
Aug 19, 2008
filing date -
Sep 13, 2007
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Abstract
A phase locked loop comprising: an oscillator for generating an output signal of a frequency that is dependent on an input to the oscillator; sampling means for generating a sequence of digital values representing the output of the oscillator at moments synchronized with a reference frequency; a difference unit for generating a feedback signal representing the difference between successive values in the sequence; and an integrator for integrating the difference between the feedback signal and a signal of a desired output frequency; the signal input to the oscillator being dependent on the output of the integrator.
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