Phase locked loop unlock detector

Details Phase locked loop unlock detector Phase locked loop unlock detector

1998-10-21

2000-06-06

Kinkead, Arnold

Oscillators

Phase locked loop having lock indicating or detecting means

331 1A, 327160, 360 51, 369 59, 369124, 375376, G11B 500, G11B 2710

Patent

active

060723688

ABSTRACT:
A phase locked loop unlock detector is provided for a data detection channel in a direct access storage device (DASD). The phase locked loop unlock detector includes a counter for generating a threshold reference relative to a reference signal. An unlock window generator is coupled to the counter for generating an unlock window signal. An unlock error detector is coupled to the unlock window generator for comparing a variable frequency signal with the unlock window signal.

REFERENCES:
patent: 5663688 (1997-09-01), Delmas et al.

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