波谱学杂志 ›› 2006, Vol. 23 ›› Issue (4): 494-501.

• 研究论文 • 上一篇    下一篇

300 MHz核磁共振频率源的研制

乔勇; 季文彬; 蒋瑜   

  1. (光谱学与波谱学教育部重点实验室,华东师范大学,上海 200062)
  • 收稿日期:2006-01-12 修回日期:2006-03-27 出版日期:2006-12-05 发布日期:2009-12-05
  • 通讯作者: 蒋瑜

The Design of A 300 MHz NMR Frequency Source

QIAO Yong; JI Wen-bin; JIANG Yu   

  1. (Key Laboratory for Optical and Magnetic Resonance Spectroscopy of Ministry of Education, Department of Physics, East China Normal University, Shanghai, 200062, China)
  • Received:2006-01-12 Revised:2006-03-27 Online:2006-12-05 Published:2009-12-05
  • Contact: Jiang Yu

摘要: 介绍了基于Analog Device公司AD9954设计的数字化频率源,可以实现宽带高频(5 MHz~125 MHz、280 MHz~301 MHz)、高稳定度(1×10-9)、低相位噪声(301 MHz,≤-127 dBc/Hz@250 kHz offset)频率输出以及频率、相位和幅度的高速切换. 该数字化频率源可应用于300 MHz核磁共振谱仪和磁共振成像仪,可部分取代昂贵的进口频率源. 本文最后给出核磁实验结果.

关键词: 核磁共振, 频率源, 直接数字合成, 模拟倍频结合, 相位噪声

Abstract: A digital frequency source designed for a 300 MHz nuclear magnetic resonance spectrometer is described. Controlled by MCU or by PC, the frequency source is capable of generating a frequency- and phase-continuous tunable signal with output frequency ranging from 5 MHz to 125 MHz and 280 MHz to 301 MHz. Practical implementation of the frequency source to a 300 MHz NMR spectrometer is described, and its performance was tested with solid state NMR experiments. It is demonstrated that the frequency source results in radiofrequency output with low phase noise, high stability and high purity.

Key words: NMR, frequency source, DDS, analog frequency doubler, phase noise

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