Phase-locked loop circuit with a multi-cycle phase detector and multi-current charge pump

摘要

A phase-locked loop circuit for locking the phase of an oscillator to the phase of a reference signal includes a multi-cycle phase detector (11) for detecting a phase difference between an input signal and said reference signal through multiple clock cycles and for sending a corresponding phase adjustment signal, and, a multiple current source charge pump (12) connecting to said phase detector for receiving said phase adjustment signal and sending a current signal depending upon said phase adjustment signal.