| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a synchronization-apparatus capable of realizing a synchronization establishing time having high synchronization accuracy and within a predetermined time, while ensuring lock range. <P>SOLUTION: A line clock signal is generated to ensure a lock range by a PLL having a voltage control oscillation unit 50, and a jitter remover 20 for performing phase comparison for comparing the phase of a reception clock signal reproduced by an SERDES 10 with the phase of an output signal from the unit 50 to detect phase difference, and generating a control voltage signal to be inputted into the voltage control oscillation unit, on the basis of the detected phase difference. Also, synchronization accuracy and a synchronization establishing time within a predetermined time are ensured by a control loop unit, having an OCXO 60, a DDS 50 for generating a signal of the same frequency as that of the line clock signal from the OCXO 60; and a calculation unit 41 for calculating a frequency control signal for changing the frequency of the DDS 50, on the basis of the difference in frequency between the line clock signal and a local clock signal after a predetermined time. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
