Patent ID: 6977558

Claim:
A phase-locked loop, comprising: a phase detector, a charge pump coupled to the phase detector, a low pass filter coupled to the charge pump, and a voltage control oscillator coupled to the charge pump and a supply voltage, wherein the low pass filter inputs a control voltage to the voltage controlled oscillator for generation of an output clock; and a voltage regulator coupled to an output of the low pass filter, the voltage regulator for sensing the control voltage during normal operation of the phase-locked loop, and for dynamically adjusting the supply voltage in response to the control voltage, wherein the voltage control regulator uses the control voltage as an error signal that is proportionate to process/temperature drift occurring in the phases locked loop such that the phase-locked loop maintains the control voltage within a predefined range of a reference voltage regulator comprising, a summing node for continually sensing the control voltage and for comparing a combination of the control voltage and a current output of the voltage regulator to the reference voltage to determine an amount of drift occurring in the phase-locked loop; a first loop gain for multiplying an output from the summing node to generate the supply voltage that is input to the voltage control oscillator; and a second loop gain for multiplying the supply voltage by a continuation value to create a feedback voltage and for inputting the feedback voltage to the summing node as the current output of the voltage regulator, wherein in response to control voltage changes the supply voltage is set such that the voltage control oscillator will cause the phase-locked loop to shift the control voltage towards the reference voltage thereby compensating the phase-locked loop for temperature/process drift.