Circuits and methods providing clock frequency adjustment in response to supply voltage changes
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United States of America Patent
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Apr 25, 2017
Grant Date -
Jan 5, 2017
app pub date -
Jul 1, 2015
filing date -
Jul 1, 2015
priority date (Note) -
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Abstract
Methods, systems, and circuits for providing compensation for voltage variation are disclosed. A system includes: a voltage comparator configured to assert a control signal in response to detecting that one or more of power supply voltages droops below a threshold amount; a phase locked loop (PLL) configured to divide an output frequency for the PLL in response to the assertion of the control signal; a plurality of voltage sensors corresponding to the plurality of power supply voltages, the voltage sensors configured to output respective digital signals indicative of a voltage level of its corresponding power supply voltage; and a control circuit configured to control an oscillator frequency in the PLL during the open-loop mode responsive to the respective digital signals.
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