Design a Low Noise×9 Frequency Multiplication Chain for Rubidium Atomic Frequency Standard
QIU Zi-jing1,2,3, QI Feng1,2, MING Gang1,2, ZHONG Da1,2, MEI Gang-hua1,2
1. Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China;
2. Key Laboratory of Atomic Frequency Standards, Chinese Academy of Sciences, Wuhan, Hubei 430071, China;
3. University of Chinese Academy of Sciences, Beijing 100080, China
Abstract：Both physics package and electronic system contribute to the short-term frequency stability of a rubidium atomic frequency standard (RAFS).The contribution of the electronic system to RAFS short-term frequency stability depends mainly on the phase noise of microwave chain.Structure and operating principle of a typical traditional microwave chain are analyzed,and the×9 frequency multiplier and the modulator are found to be main sources of noise.To depress phase noise of the whole microwave chain,a new type of×9 frequency multiplication chain is designed by using SBD (Schottky Barrier Diode) for multiplication and increasing carrier frequency of modulation.Test showed that the phase noise of the 90MHz output signal of the chain is reduced by more than 12dB,and contribution of the chain to the frequency stability of RAFS is less than 1.9E-13 at 1s.A short term frequency stability 3.53E-13(1s),1.27E-13(10s) and 3.97E-14(100s) of RAFS has been achieved by using the multiplication chain.
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2017, Vol. 45 
