Details

Autor(en) / Beteiligte

• Chen, Yongtai
• Xu, Donghui
• Shen, Yanxin
• Ye, Sen
• Tang, Jing
• Su, Lijuan

Titel

Analysis and Design of an Improved Servo System for Rubidium Atomic Frequency Standard

Ist Teil von

• Wuhan University journal of natural sciences, 2013-02, Vol.18 (1), p.67-72

Ort / Verlag

Heidelberg: Wuhan University

Erscheinungsjahr

2013

Quelle

SpringerNature Journals

Beschreibungen/Notizen

• In this paper, we analyze and design a new type of servo system with noninteger voltage controlled crystal oscillator （VCXO） for rubidium atomic frequency standard （RAFS）, which does not require fractional frequency synthesizer. By the estab- lishment of the loop equations with noises and drifts, we prove that all the components of the loop can affect its performance in- dex, and in which, RAFS long-term frequency stability is mainly determined by frequency multiplier, quantum system, and servo amplifier; the short-term one is mostly decided by VCXO. Owing to the elimination of the frequency synthesizer and its additive mixing unit, we can reduce phase noise and stray of the servo sys- tem, and it is favorable for miniaturizing the RAFS system. In addition, we adopt some targeted optimization measures to im- prove the frequency stability index. The good short-term fre- quency stability index is also validated by the test results.