Patent ID: 7382169

Claim:
A system comprising: a phase-locked loop circuit adapted to receive a reference signal and a feedback signal and provide an output signal; and a control circuit responsive to the reference signal and the feedback signal and adapted to modify a loop filter current of a loop filter within the phase-locked loop circuit to reduce a phase error of the output signal, the control circuit comprising: a phase detector adapted to receive the reference signal and the feedback signal and provide a phase detector output signal; a first counter adapted to receive the phase detector output signal and provide a first counter output signal based on the phase detector output signal; and a digital-to-analog converter adapted to receive the first counter output signal and modify the loop filter current of the loop filter based on the first counter output signal; wherein the control circuit is adapted to modify the loop filter current by at least one of providing a current to and receiving a current from at least one of a positive node and a negative node of the loop filter.