PHASE SYNCHRONIZATION APPARATUS

摘要

PURPOSE: A phase synchronization apparatus is provided to implement a stable operation by using a voltage controlled oscillator with low gain and selecting an available frequency band. CONSTITUTION: In a phase synchronization apparatus, a phase detector(10) generates a pull-up control signal and pull-down control signal. A charge pump(20) performs a voltage pumping operation in response to the pull-up control signal and pull-down control signal. A low pass filter(30) generates a control voltage by filtering a pumping voltage. A bias controller(40) generates a bias control signal of n-bit in response to an input clock.