Patent ID: 7352837

Claim:
A phase-locked loop, comprising: a variable frequency generator configurable for generating an output signal having a frequency which varies based at least in part on at least first and second control signals presented thereto; a comparator configurable for receiving a first signal and a second signal, the first signal being an input signal presented to the phase-locked loop and the second signal being representative of the output signal from the variable frequency generator, the comparator generating a difference signal representative of a difference between at least one of a phase and a frequency of the first and second signals, the difference signal comprising the first control signal; and a first counter configurable for generating an output count based at least in part on the difference signal from the comparator, the output count being a digital representation of the difference signal, the output count comprising the second control signal; wherein the frequency of the output signal from the variable frequency generator is determined as a function of the difference signal and the output count.