| 摘要 |
A frequency regulator including a phase frequency detector and a lock detection unit. The phase frequency detector receives a reference signal and a feedback signal, compares a phase of the reference signal and a phase of the feedback signal, and outputs a first control signal and a second control signal to regulate phase and frequency of the feedback signal. The lock detection unit generates a phase lock signal in a case of keeping that a time difference between the first control signal and the second control signal is smaller than a reference time during an interval time period of at least a half period of the reference signal.
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