氢原子钟频率合成器设计  

Design of frequency synthesizer for hydrogen maser

作　　者：李锡瑞[1] 蔡勇[1] LI Xi-rui;CAIYong(Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China)

机构地区：[1]中国科学院上海天文台,上海200030

出　　处：《时间频率学报》2022年第1期44-51,共8页Journal of Time and Frequency

基　　金：国家自然科学基金资助项目(U1731130)。

摘　　要：为了满足氢原子钟可靠性、小型化设计要求,研制了由AD9956芯片和FPGA芯片EP2C8T144构成的一种直接数字合成(DDS)频率合成器。在分析DDS的基本原理和特点的基础上,从硬、软件等方面详细地介绍了该频率合成器的设计。测试结果表明该频率合成器功能可靠,性能稳定;并且能更好地抑制谐波,使得氢原子钟的频率稳定度优于之前的设计。For the reliability and miniaturization of the hydrogen maser,a direct digital synthesis(DDS)frequency synthesizer was developed which composed of the AD9956 chip and the EP2C8T144 chip.Based on the analysis of the basic principles and characteristics of DDS,the design of the frequency synthesizer is introduced in detail from the aspects of hardware and software.The test results shown that the function is reliable and the performance is stable for the designed DDS.In addition,it can suppress the harmonics,and the frequency stability of the hydrogen atomic clock is better than the previous design.

关 键 词：AD9956 直接数字合成 频率合成 

分 类 号：TH714.14[机械工程—测试计量技术及仪器] TN74[机械工程—仪器科学与技术]