Patent ID: 8050781

Claim:
An electronic device comprising: a power supply; an integrated circuit connected to the power supply, the integrated circuit comprising an internal speed measuring circuit that includes: first and second timing paths, an input signal generator and an output signal generator driven by a common clock signal with a clock cycle, the input signal generator connected to an input end of the first timing path and to an input end of the second timing path, the output signal generator being configured to output a first signal based upon a determination whether a delay difference between said first and second timing paths is greater than the clock cycle, the first signal indicating a current speed of the integrated circuit; a power supply control circuit external to the integrated circuit and connected to the internal speed measuring circuit of the integrated circuit and to the power supply, the power supply control circuit being configured to receive the first signal from the internal speed measuring circuit; and generate a voltage control signal based on the first signal and send the voltage control signal to the power supply, wherein the power supply is configured to modify a supply voltage to the integrated circuit based on the voltage control signal.