CLOCK SYNCHRONIZATION DEVICE AND METHOD USING DUAL PHASE CONTROL IN DIGITAL CLOCK SYNCHRONOUS SYSTEM

摘要

PURPOSE: A clock synchronization device and method using a dual phase control is provided to carry out the control by a phase error data and the control by a load data of a counter at once as to improve an accuracy of a phase error data. CONSTITUTION: A clock synchronization device in a digital clock synchronous system includes a digital/analog converter(107) and a voltage controlled oscillator(109). In the clock synchronization device using a dual phase control, a dual phase detection circuit(115) receives a reference clock, a loop clock and a system clock to output a phase error data and a load data. A dual port RAM(103) receives the phase error data and the load data to store the received data sequently. A controller(105) reads the phase error data and the load data with a described period to double-control the voltage controlled oscillator through the digital converter.