Delay locked loop circuit and method
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United States of America Patent
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May 12, 2009
Grant Date -
Feb 7, 2008
app pub date -
Oct 4, 2007
filing date -
Feb 3, 2005
priority date (Note) -
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Abstract
A delay locked loop includes initialization circuitry that ensures that a DLL is initialized to an operating point that is not to close to either end of a delay vs. control voltage characteristic. The initialization circuitry forces the DLL to initially search for a lock point starting from an initial delay, the delay is varied in one direction, forcing the DLL to skip the first lock point. The initialization circuitry only allows the DLL to vary the delay of the voltage controlled delay loop in the one direction from the initial delay until the operating point is reached.
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