Digital phase-locked loop apparatus using frequency shift keying and method of controlling the same
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United States of America Patent
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Oct 8, 2013
Grant Date -
Feb 21, 2013
app pub date -
Aug 20, 2012
filing date -
Aug 19, 2011
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Abstract
A digital phase-locked loop apparatus using FSK includes a PFD detecting phase differences between a reference clock and a frequency-divided signal, and a first adder for generating first digital control codes by adding first digital codes, second digital codes, and channel frequency codes including channel information to each other, the first digital codes being converted from time differences between first and second pulses. The apparatus further includes a digital filter correcting errors of the first digital control codes to generate second digital control codes, a DCO for varying an oscillating frequency in accordance with a digital tuning word based on the second digital control codes, and a dual modulus division unit dividing the oscillating frequency into a frequency-divided signal.
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