System and method of calibrating a phase-locked loop while maintaining lock
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United States of America Patent
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Jan 28, 2014
Grant Date -
May 16, 2013
app pub date -
Nov 15, 2011
filing date -
Nov 15, 2011
priority date (Note) -
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Abstract
A method of calibrating a phase-locked loop (PLL) while maintaining lock includes detecting that a control signal to an oscillator in a PLL has exceeded a threshold value while the PLL is locked to an input signal. In response, an operating current of the oscillator is adjusted to return the control signal below the threshold value while maintaining lock of the PLL to the input signal. Adjusting the operating current includes slowly varying an output current of a calibration circuit coupled to the PLL, enabling the PLL to maintain lock to the input signal during adjustment of the operating current.
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