作　　者： ; ; (刘春平）;

机构地区： 深圳大学工程技术学院

出　　处： 《半导体技术》 2003年第9期69-71,共3页

摘　　要： 给出了一种用于第三代移动通信系统(3G)CDMA2000基站的时钟同步方案。由一个双星接收卡接收GPS/GLONASS标准秒信号作为整个时钟同步系统的参考,分两级锁相环实现。该设计保证了输出时钟的长期稳定性和短期稳定性,满足协议所规定的同步精度。详细介绍了数字鉴相器、2s产生电路、相差检测及控制电路的电路设计和有关仿真结果。 A clock synchronization scheme of 3rd generation mobile communication system,CDMA2000 is presented. The PPS signal received by a GPS/GLONASS receiving card is regarded asa reference of the whole clock synchronization system. Both the long term stability and the shortlong term stability of the output clocks are assured by this scheme and the synchronization requestsof the protocol are contented. Then the circuits and the modeling results of the digital phase detector,the 2s generating module and the phase detecting and controlling module are presented.

关 键 词： 基站 时钟同步 锁相环 恒温晶振 鉴相 分频

领　　域： [电子电信] [电子电信]