Lock detecter and clock generator having the same

摘要

A lock detector and a clock generator including the same are disclosed. A lock detector includes a counter unit which counts a non-matching section of a first signal and a second signal to provide a count value, the first signal and the second signal being comparison result signals obtained by comparing a phase of a reference signal with a phase of a comparison signal, and a lock detection unit which outputs a lock detection signal based on a result of comparing the count value with the reference value. Accordingly, a lock state of the phase-locked loop can be detected rapidly and exactly.

主权项

1. A lock detector comprising:
a counter unit which counts a non-matching section of a first signal and a second signal to provide a count value, the first signal and the second signal being comparison result signals obtained by comparing a phase of a reference signal with a phase of a comparison signal, wherein the counter unit includes:
a first register that stores the count value in response to a delayed clock;a first gate which determines the non-matching section of the first signal and the second signal and outputs a determination result signal as a determination result; anda first counter which counts a clock signal when the determination result signal of the first gate indicates a non-matching state; and a lock detection unit which outputs a lock detection signal based on a result of comparing the count value with a reference value.