Phase frequency detector with a novel D flip flop
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United States of America Patent
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Aug 26, 2008
Grant Date -
Jan 25, 2007
app pub date -
Sep 29, 2006
filing date -
Apr 2, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Methods, systems and components for use with or as a phase frequency detector. The phase frequency detector stretches its output pulse, allowing the detector to operate in a more linear region. As part of the invention, a new configuration for a D type flip flop is also disclosed. In one embodiment, the D type flip flop triggers at both the rising and the falling edges of the reference input, allowing a lower frequency input to be used while having the advantages of a higher frequency.
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