Phase locked loop with adaptive filter for DCO synchronization
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United States of America Patent
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Aug 31, 2010
Grant Date -
Jul 9, 2009
app pub date -
Dec 11, 2008
filing date -
Jan 8, 2008
priority date (Note) -
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Abstract
A digital phase locked loop has a digital controlled oscillator, a feedback loop coupled to the output of said digital controlled oscillator, a phase detector for comparing a feedback signal from said feedback loop with a reference signal to produce a phase error signal, and a low pass filter for filtering the phase error signal for controlling said digital controlled oscillator. A bandwidth calculation unit calculates the required filter bandwidth based on the phase error. The bandwidth calculation unit then controls the bandwidth of said low pass filter, which is thus adaptively adjusted in accordance with the phase error.
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