A method and apparatus is disclosed for adjusting at least one of a supply voltage and a clocking frequency applied to digital circuitry of a computing device, wherein the digital circuitry comprises a critical path circuit. A propagation delay frequency representing a propagation delay of the critical path circuit is generated, and a frequency error signal is generated representing a difference between a reference frequency and the propagation delay frequency. At least one of the supply voltage and the clocking frequency is adjusted in response to the frequency error signal.

 
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