Apparatus and methods for fast charge pump holdover on signal interruption
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United States of America Patent
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Mar 8, 2016
Grant Date -
Aug 6, 2015
app pub date -
Feb 3, 2015
filing date -
Jan 31, 2014
priority date (Note) -
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Abstract
Provided herein are apparatus and methods for fast charge pump holdover on signal interruption. In certain configurations, a clock generator system includes a phase-locked loop (PLL), a fast detect circuit, and a switch electrically coupled to an input of the PLL's loop filter. The fast detect circuit relatively quickly detects when an input signal to the PLL is lost. The fast detect circuit can quickly detect the loss of phase lock and can place the PLL into a holdover such that the frequency of a clock signal generated by the PLL remains within an acceptable range.
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