High-speed and high-precision phase locked loop
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United States of America Patent
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Aug 16, 2005
Issued Date -
N/A
app pub date -
Jun 25, 2002
filing date -
Apr 12, 1996
priority date (Note) -
Expired
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Abstract
A phase lock loop includes a charge pump, a voltage controlled oscillator (VCO), and a phase frequency detector. The phase frequency detector has a dynamic logic structure. The phase frequency detector generates up and down signals for directing the charge pump to provide a voltage signal to the VCO to vary the frequency of the VCO clock. The difference between the up and down signals is indicative of the phase difference between the reference clock signal and the VCO clock. The phase frequency detector includes up and down signal generators for generating the up and down signals, respectively.
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