Cycle slip detector and phase locked loop circuit and digital si

Details Cycle slip detector and phase locked loop circuit and digital si Cycle slip detector and phase locked loop circuit and digital si

1996-06-26

1998-08-04

Chin, Stephen

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

375317, 375355, 375375, H03D 324, H04L 700

Patent

active

057906130

ABSTRACT:
A cycle slip detector of the invention has first and second comparators. The first comparator determines that the value of a phase error signal being supplied thereto is larger than a first threshold value near a maximum value possibly taken by the phase error signal, and responsively generates a first determining signal. The second comparator determines that the value of the phase error signal being supplied thereto is smaller than a second threshold value of a minimum value possibly taken by the phase error signal, and responsively generates a second determining signal. The cycle slip detector generates a cycle slip detecting signal when the first determining signal and the second determining signal generate in succession. By applying the cycle slip detector as mentioned, it is possible to provide a phase locked loop circuit having a wide frequency range in which a withdraw or pull-in operation is permitted. If the cycle slip detector is applied to a digital signal reproducing apparatus, it is possible to reduce an access time required to read a signal at a specified recording position on an recording medium from the unlock state of the phase locked loop circuit.

REFERENCES:
patent: 5412692 (1995-05-01), Uchida
patent: 5537442 (1996-07-01), Nakamura et al.

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