波谱学杂志 ›› 2001, Vol. 18 ›› Issue (4): 351-355.

• 研究论文 • 上一篇    下一篇

用于核磁共振的直接数字合成频率源

蒋赟,蒋瑜,陶红艳,李鲠颖   

  1. 教育部光谱学和波谱学重点实验室,华东师范大学物理系,上海 200062
  • 收稿日期:2001-06-29 修回日期:2001-09-10 出版日期:2001-12-05 发布日期:2001-12-05
  • 作者简介:蒋赟(1978-),男,硕士研究生.
  • 基金资助:

    高等学校骨干教师资助计划项目.

DDS FREQUENCY SOURCE IN NMR

JIANG Yun, JIANG Yu, TAO Hong-yan, LI Geng-ying   

  1. Key Laboratory for Optical and Magnetic Resonance Spectroscopy, Dept of  Physics, East China Normal Univ., Shanghai 200062
  • Received:2001-06-29 Revised:2001-09-10 Online:2001-12-05 Published:2001-12-05
  • Supported by:

    高等学校骨干教师资助计划项目.

摘要:

直接数字频率源的使用可以简化核磁共振谱仪的设计,降低核磁共振谱仪设计的成本. 文中介绍一种采用Analog Device公司的AD7008芯片设计的基于PC机的直接数字合成频率源,它可实现频率和相位的高速切换,频率分辨率为0.01Hz,相位分辨率为0.09°,最后给出核磁共振实验结果.

关键词: 直接数字合成, 频率源, 频率切换, 相位切换, 幅度调制, 核磁共振

Abstract:

The use of DDS chip made it possible to simplify the design and reduce the cost of a pulsed nuclear magnetic resonance spectrometer. Herein, we will int roduce a DDS frequency source on ISA bus. Three DDS chips, AD 7008, were used in t his design. The resolutions of the frequency and the phase of this DDS board are  0.01Hz and 0.09°respectively. The implementation of this frequency source to NMR is discussed. Finally NMR experiment results are shown.

Key words: Direct Digital Synthesis, Frequency Source, Frequency-switching, Phase-switching, Amplitude Modulation, NMR

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