PHASE COMPARATOR OF DELAY LOCKED LOOP AND DELAY SYNCHRONIZATION method THEREOF

摘要

PURPOSE: A phase comparator of delay locked loop and a delay synchronization method thereof is provided to perform a phase comparison by comparing a delay clock signal due to delay of the K-th pulse of a reference clock signal to the next pulse to the K-th pulse. CONSTITUTION: The phase comparator of delay locked loop and a delay synchronization method thereof comprises: a delaying divide(11) for receiving a reference clock signal and generating a delay clock signal by delaying as much as a delay time, which is determined by a voltage level of a predetermined control signal; a phase comparing device(13) for a delay increasing signal when inputting the K-th pulse and a delay decreasing signal when inputting the L-th pulse by comparing a delay clock signal of the K-th pulse of a reference clock signal to a delay clock signal of the L(L=K+1)-th pulse of the reference clock signal; and a charge pump(15) for supplying the control signal to change a voltage level according to a duty rate of the delay increasing signal and the delay decreasing signal.