高精度中频数字鉴相器在FPGA上的实现  

High-precision intermediate-frequency digital phase detector based on FPGA

作　　者：刘晓庆[1] 刘波[1] 马新朋[2] 

机构地区：[1]中国科学院上海应用物理研究所,上海201800 [2]中国科学院高能物理研究所,北京100049

出　　处：《核技术》2012年第5期380-385,共6页Nuclear Techniques

摘　　要：介绍了一种高精度中频数字鉴相器的鉴相原理,以及在设计过程中以数字滤波器为主的参数选择方法,并且将其在FPGA上硬件实现。该鉴相器采用数字I/Q技术,鉴相精度达到0.029°,利用该高精度中频数字鉴相器对3.71875 MHz中频信号进行鉴相,实际鉴相结果为:绝对相位鉴相结果好于0.05°,均方根值为0.0076°;相对相位鉴相结果好于0.1°,均方根值为0.0287°。In this paper,we report a high-precision intermediate-frequency digital phase detector.Suitable parameters for digital filter and other modules in the digital phase detector are chosen via careful analysis.The digital phase detector uses I/Q technology,and is achieved on FPGA chip,working as a part of experimental setup to detect the phase of intermediate-frequency signal.The results show that precision of the digital phase detector is 0.029°.The phase discrimination for one 3.71875 MHz signal is better than 0.05°,with a root mean square phase value of 0.0076°;while it is better than 0.1° with a root mean square phase value of 0.0287° for two 3.71875 MHz signals.

关 键 词：数字鉴相器 数字滤波器 数字I/Q FPGA 

分 类 号：TN911.8[电子电信—通信与信息系统]