一种基于相位差变化率的多通道ADC系统同步技术  

A Synchronization Technology of Multi-Channel ADC System Based on Phase Difference Change Rate

作　　者：罗双才 LUO Shuangcai(Southwest China Institute of Electronic Technology,Chengdu 610036,China)

机构地区：[1]中国电子科技集团第十研究所,成都610036

出　　处：《电子信息对抗技术》2020年第3期83-86,共4页Electronic Information Warfare Technology

摘　　要：多通道同步技术一直是高速ADC应用的关键技术,直接影响了多通道系统的性能。利用时延差在不同频率差下展现的相位变化规律,采用最小二乘算法估计通道间的时差,并给出算法实现的系统方案。通过仿真和试验表明,算法具有较好的性能和可实现性。在SNR为15dB和积累时间是20μs的条件下,时差估计的均方根误差约为60ps。Multi-channel synchronization technology is always the key technology of high-speed ADC application, which directly affects the performance of multi-channel system. The least square algorithm is used to estimate the time difference between channels by the phase variation law of delay difference under different frequency differences, and the system scheme of the algorithm is given. The simulation and experiment show that the algorithm has a good performance and realizability. Under the condition of SNR 15 dB and accumulation time 20 μs, the root mean square error of time difference estimation is about 60 ps.

关 键 词：同步技术 最小二乘法 高速ADC 

分 类 号：TN971.1[电子电信—信号与信息处理]