Self-adjusting startup control for charge pump current source in phase locked loop
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United States of America Patent
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Aug 17, 1999
Grant Date -
N/A
app pub date -
Mar 16, 1998
filing date -
Mar 16, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
A circuit and a method are provided for reducing power consumption in a phase-locked loop (PLL) by controlling how long the bias current for the charge pump is turned on. In such a circuit, a bias check circuit that indicates when the bias current has stabilized, and a self-adjusting control circuit including an internal counter are provided to measure how long the bias current takes to start up when the PLL is locked. Then the self-adjusting control circuit prevents the bias current from turning on until there is just enough time for it to stabilize before a charge pump event. A default control circuit is also provided to turn the bias current on for specified intervals when the PLL is out of lock.
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