Loss of lock detector for master timing generator
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United States of America Patent
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Feb 17, 1998
Grant Date -
N/A
app pub date -
Feb 1, 1996
filing date -
Feb 1, 1996
priority date (Note) -
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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.
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