Patent ID: 6686784
Filing Date: 2004-02-03
Classification: H03L

Abstract:
A phase-locked loop, comprising:a phase detector detecting the phase difference between a reference signal and an oscillation feedback signal and generating a digital phase-difference signal according to a mean-frequency signal; a digit pump receiving said digital phase-difference signal and generating a proportional gain signal and an accumulative gain signal according to a proportional gain value and an accumulative gain value; a digital filter receiving said proportional gain signal and said accumulative gain signal so as to generate a digital control signal; a digital-controlled oscillator (DCO), for receiving said digital control signal and said mean-frequency signal so as to generate a phase-swap signal; a phase selector receiving a plurality of multi-phase signals and said phase-swap signal so as to select one among neighboring phases to be said mean-frequency signal according to said phase-swap signal; and a frequency divider receiving said mean-frequency signal and dividing the frequency thereof so as to generate said oscillation feedback signal.