Chinese Journal of Magnetic Resonance ›› 2014, Vol. 31 ›› Issue (4): 587-595.doi: 10.11938/cjmr20140413

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Design of a Narrow-Band Voltage Controlled Oscillator for Phase-Locked Frequency Multiplier in Miniature Rubidium Atomic Clock

CHEN Tao1–3,SUN Bing-feng1,2,YAN Shi-dong1,MEI Gang-hua1,ZHONG Da1*   

  1. 1. CAS. Key laboratory of Atomic Frequency Standards (Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences), Wuhan 430071, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Basic Department, Wuhan Technology and Business University, Wuhan 430065, China
  • Received:2014-03-17 Revised:2014-10-29 Online:2014-12-05 Published:2014-12-05
  • Contact: Da ZHONG E-mail:zhongda@wipm.ac.cn
  • About author:*Corresponding author:ZHONG Da, Tel: 027-87198726, E-mail: zhongda@wipm.ac.cn.

Abstract:

A narrow-band voltage controlled oscillator (VCO) circuit for phase-locked frequency multiplier in rubidium atomic clock was designed. A clapp oscillation circuit scheme was used in the design. The design of the VCO was analyzed and optimized by simulation. A true VCO circuit was constructed and tested. The performance specifications of VCO were as following: frequency covering 440~470 MHz, tuning sensitivity 18 MHz/V and second harmonic suppression -15 dBc. The phase-locked frequency multiplication system was found to have a low phase noise meeting the requirement of the miniature rubidium atomic clocks.

Key words: rubidium atomic clocks, narrow band voltage controlled oscillator, phaselocked frequency multiplication, phase noise

CLC Number: