Clock synchronizing circuit

Abstract From the Canadian patent

A clock synchronizing circuit comprises a voltage controlled oscillator (VCO) for producing an output signal whose oscillation frequency changes in response to control signals. A phase comparator compares a phase of an input signal and a phase of the output signal to thereby generate a phase difference signal. A filter filters the phase difference signal to thereby output a filtered phase difference signal. A frequency synchronizing circuit responsive to the filtered phase difference signal generates a first compensation signal for controlling a frequency of the output signal. A phase synchronizing circuit responsive to the filtered phase difference signal generates a second compensation …