Method and apparatus for initializing a delay locked loop

Details Method and apparatus for initializing a delay locked loop Method and apparatus for initializing a delay locked loop

2007-03-13

2007-03-13

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S159000, C327S161000

Reexamination Certificate

active

11050644

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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