|
|
Design and Realization of a Frequency Lock Loop Circuit for a Miniaturized Rubidium Atomic Frequency Standard |
SUN Bing-feng1,2,YAN Shi-dong1,WANG Peng-fei1,2, HOU lin-shan1,ZHONG-da1,MEI Gang-hua1 |
1.Key laboratory of Atomic Frequency Standards, The Chinese Academy of Sciences,Wuhan Institute of Physics and Mathematics, Wuhan, Hubei 430071, China;
2. University of Chinese Academy of Sciences, Beijing 100080, China |
|
|
Abstract A frequency-locked loop (FLL) circuit was designed and realized for a miniaturized high performance rubidium atomic frequency standard (RAFS). The 10MHz signal from a VCXO was transformed into the microwave interrogation signal with frequency of 6834.6875MHz by a 45.5645833 multiplier and a consequent 15 one. The 455.645833 multiplier was designed by using the digital phase-locked technique. The frequency modulation of the interrogation signal was realized in the 455.645833MHz signal. The phase noise of the signal was measured and analyzed. Results showed that the fractional stability of the microwave signal is in a level of 3.2×10-12τ-1/2. The short-term frequency stability of a RAFS containing the FLL circuit was tested, and a result of 5×10-12τ-1/2(1 s≤τ≤100 s)was obtained. This result is obviously better than that of an average commercial RAFS.
|
|
|
|
|
[1]X72 Precision Rubidium Oscillator datasheet[EB]. http://www.symmetricom.com.
[2]TEMEX TIME Low Cost & Profile Frequency Rubidium Standard (LPFRS) [EB].
http://www.temextime.com.
[3]康松柏,赵峰,王芳,等. 铷原子频标物理系统小型化设计[J]. 计量学报,2012,33(1):73-76.
[4]阎世栋,孙兵锋,钟达,等. 一种基于LMX2485E芯片的调制倍频电路[J]. 电子产品世界,2011,(Z1):34-36.
[5]张肃文. 高频电子线路(第四版)[M].北京:高等教育出版社,2004.
[6]Audoin C, Candelier V, Dimarcq N. A Limit to the frequency stability of passive frequency standards due to an intermodulation effect[J].IEEE Transactions on Instrumentation and Measureme,1991, 40(2):121-125.
[7]Deng J Q, De Marchi A, Walls F L, et al. Frequency stability of cell-based passive frequency standards: reducing the effects of local-oscillator PM noise[C]//IEEE.Frequency Control Symposium, 1998. Proceedings of the 1998 IEEE International,Pasadena, CA.1998,95-98.
[8]Mileti G, Deng J Q, Walls F L, et al. Recent progress in laser-pumped rubidium gas cell frequency standards[C]// IEEE.Frequency Control Symposium, 1996. 50th Proceedings of the 1996 IEEE International, Honolulu, HI.1996, 1066-1072. |
|
|
|