Apparatus and method for evaluating the performance of a system in a control loop
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United States of America Patent
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Mar 14, 2017
Grant Date -
Mar 12, 2015
app pub date -
Sep 6, 2013
filing date -
Sep 6, 2013
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Abstract
A monitoring circuit for monitoring the performance of a phase locked loop having a divider therein, the divider comprising at least a first counter, the monitoring circuit comprising at least one memory element for capturing a value of the first counter after a predetermined time from a system event in the operation of the phase locked loop, a variability calculator for comparing a value of the counter with a preceding value of the counter to calculate a variation, and a circuit responsive to the estimate of variation for outputting a status signal.
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