Phase frequency detector
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United States of America Patent
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Dec 27, 2016
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Feb 17, 2015
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Sep 14, 2012
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Abstract
Described is an apparatus comprising: a first phase frequency detector (PFD) to determine a coarse phase difference between a first clock signal and a second clock signal, the first PFD to generate a first output indicating the coarse phase difference; and a second PFD, coupled to the first PFD, to determine a fine phase difference between the first clock signal and the second clock signal, the second PFD to generate a second output indicating the fine phase difference.
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