Low jitter clock recovery circuit
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United States of America Patent
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Dec 27, 2011
Grant Date -
Mar 15, 2007
app pub date -
Sep 13, 2005
filing date -
Sep 13, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A clock recovery circuit includes a first phase detector for measuring the phase difference between a first clock signal from a voltage controlled oscillator (VCO) and a data signal. A phase shifter responsive to a control signal based on this phase difference adjusts the phase of an incoming clock signal to yield a second clock signal. The phase difference between the first clock signal and the second clock signal is measured and the resulting signal is low-pass filtered to derive a control signal for controlling the VCO. The phase locked loop including the VCO filters out jitter.
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