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US08368444B2 Delay locked loop including a mechanism for reducing lock time 有权
延迟锁定环包括减少锁定时间的机制

Delay locked loop including a mechanism for reducing lock time
Abstract:
A delay locked loop (DLL) includes a delay line configured to provide a delayed version of a reference clock as a feedback clock. The DLL also includes a phase detector that may provide an output signal that is indicative of a change in a delay associated with the delay line. The DLL may also include a step size controller that may provide a step size indication corresponding to a first step size in response to detecting the output signal indicating a first change in delay, and to provide a step size indications corresponding to a second step size that is smaller than the first step size in response to detecting the output signal indicating a second change in delay.
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