Loss of lock detector for master timing generator

Details Loss of lock detector for master timing generator Loss of lock detector for master timing generator

1996-02-01

1998-02-17

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

327 2, 327 39, 327150, 327159, 327156, 327 20, 331DIG2, 331 25, 331 1A, H03L 7097, H03D 324

Patent

active

057195080

ABSTRACT:
A digital loss of lock detection (LLD) device for a phase looked loop (PLL) generates a locked frequency signal synchronized with a reference frequency signal. The LLD comprises first to fifth latching means for detecting when the reference clock failed high/low, when the locked clock failed high/low and when the reference clock is outside the tracking range of the PLL. The first to fifth latching means provide respectively a first to fifth error signals for each type of the above faults.

REFERENCES:
patent: 4613777 (1986-09-01), Kible
patent: 5126690 (1992-06-01), Bui et al.
patent: 5159279 (1992-10-01), Shenoi et al.
patent: 5278520 (1994-01-01), Parker et al.
patent: 5530383 (1996-06-01), May

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