一种铷原子频标频率综合器新方案的设计与实现

发布时间：2018-06-12 23:12

本文选题：铷原子频标(RAFS) + 频率综合器　；参考：《波谱学杂志》2017年04期

【摘要】：数字化和小型化是铷原子频标(RAFS)发展的重要方向.在传统铷原子频标电路中,6 840 MHz微波信号与频率综合器产生的5.312 5 MHz信号进行混频,得到用于激励铷原子跃迁的6 834.687 5 MHz微波探寻信号.早期铷频标的频率综合器大量使用了分立的模拟器件,数字化程度低、参数优化工作繁杂、电路体积较大.目前常用直接数字频率合成器(DDS)方案直接产生5.312 5 MHz信号,但这种数字电路方案通常需要对10 MHz信号进行倍频,它存在频谱纯度较低、相位噪声高等缺点.本文介绍一种产生5.312 5 MHz信号的频率综合器解决方案,这种设计方案在应用DDS器件时无需使用10 MHz倍频电路,它具有频谱纯度较高、相位噪声低、输出频率和相位可调等优点.
[Abstract]:Digitization and miniaturization is an important direction in the development of rubidium atomic frequency standard (RAFS). In the conventional rubidium atomic frequency standard circuit, the microwave signal of 6840MHz is mixed with the signal of 5.312 5MHz produced by the frequency synthesizer, and the 6 834.687 MHz microwave searching signal is obtained to excite the transition of rubidium atom. A large number of discrete analog devices are used in the early rubidium frequency standard frequency synthesizer with low digitization, complicated parameter optimization and large circuit volume. At present, the direct digital frequency synthesizer (DDS) scheme directly generates 5.312 MHz signal, but this digital circuit usually needs to double the frequency of 10 MHz signal, which has the disadvantages of low spectral purity and high phase noise. In this paper, a frequency synthesizer solution for generating 5.312 MHz signal is introduced. This design scheme does not need to use 10MHz frequency doubling circuit in the application of DDS devices. It has the advantages of high spectral purity, low phase noise, adjustable output frequency and phase, etc.
【作者单位】：中国科学院原子频标重点实验室中国科学院武汉物理与数学研究所;中国科学院大学;
【基金】：国家重大科技专项项目
【分类号】：TM935;TN74

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