Patent ID: 8898029

Claim:
An integrated circuit comprising: a plurality of adjustable voltage regulators; a selection circuit operable to select one of a reference voltage or a voltage of a voltage regulator from the plurality of adjustable voltage regulators to form a selected output voltage, the reference voltage is a power supply voltage of a data path, the voltage regulator is a power supply of a clock path; an analog to digital converter operable to convert the selected output voltage to form a digital selected output voltage, wherein said analog to digital converter is further operable to convert the reference voltage to form a digital reference voltage; and a state machine operable to receive the digital selected output voltage and the digital reference voltage from the analog to digital converter, wherein the state machine is further operable to determine whether the digital selected output voltage, formed with the selection circuit selecting the voltage of the voltage regulator, matches the digital reference voltage and to adjust the voltage regulator that is the power supply of the clock path until a power supply voltage of the clock path is within a predefined range of the power supply voltage of the data path wherein the predefined range is determined by a number of control bits.