Nuclear Science and Techniques ›› 2019, Vol. 42 ›› Issue (4): 40105-040105.doi: 10.11889/j.0253-3219.2019.hjs.42.040105

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Design and implementation of high performance frequency synthesizer for SSRF

Hui YUAN1,2,3,Yubin ZHAO1,3,Xiang ZHENG1,3,Pengpeng GONG1,2,3,Xuefang HUANG1,Yangyang XIA1,2,Shenjie ZHAO1,3,Zhigang ZHANG1,3,Kai XU1,3,Qiang CHANG1,3,Jianfei LIU1,3()   

  1. 1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. Shanghai Key Laboratory of Cryogenics & Superconducting RF Technology, Shanghai 201800, China
  • Received:2018-12-25 Revised:2019-01-31 Online:2019-04-10 Published:2019-04-18
  • Contact: Jianfei LIU E-mail:liujianfei@sinap.ac.cn
  • About author:<named-content content-type="corresp-name">YUAN Hui</named-content>, female, born in 1992, graduated from Chengdu University of Technology in 2016, master student, major in electromagnetic field and microwave technology|<named-content content-type="corresp-name">YUAN Hui</named-content>, female, born in 1992, graduated from Chengdu University of Technology in 2016, master student, major in electromagnetic field and microwave technology|LIU Jianfei, E-mail: <email>liujianfei@sinap.ac.cn</email>
  • Supported by:
    Supported by National Natural Science Foundation of China(No.11335014)

Abstract: Background

The main signal source is an essential part of digital low level radio frequency (LLRF) control system. It is used not only to generate the highly stable reference signals, but also to produce the high precision working clock required by the control system of LLRF.

Purpose

This study aims to develope a high performance frequency synthesizer for Shanghai Synchrotron Radiation Facility (SSRF) so as to ensure high frequency system performance.

Methods

Two different techniques: phase-locked loop (PLL) and direct analog synthesis were employed to obtain the 500 MHz single frequency main signal source. Performance was measured and compared with the existing main signal source.

Results

The experimental results show that the phase noise is -125 dBc/Hz@1 kHz and -132 dBc/Hz@1 kHz respectively, both of them meet the performance requirements of the RF system of SSRF.

Conclusion

Direct analog synthesis can be used to produce main signal source for SSRF and achieve better performance.

Key words: LLRF, PLL, Direct analog synthesis, SSRF

CLC Number: 

  • TL503.2