具有快速调制功能NMR发射机的设计与实现

波谱学杂志

• 磁共振谱仪研制技术进展专栏 • 上一篇下一篇

具有快速调制功能NMR发射机的设计与实现

毛文平^1,2，李云燕^1,2，刘造¹，鲍庆嘉^1,3，刘朝阳^1*

1. 波谱与原子分子物理国家重点实验室，武汉磁共振中心（中国科学院武汉物理与数学研究所），湖北武汉 430071； 
2. 中国科学院大学，北京 100049；3. 华中科技大学物理学院，湖北武汉 430074

收稿日期:2012-11-02 修回日期:2012-11-22 出版日期:2013-03-05 发布日期:2013-03-05
通讯作者: 刘朝阳，chyliu@wipm.ac.cn E-mail:itmakes@gmail.com；chyliu@wipm.ac.cn
作者简介:毛文平(1985-)，男，湖北人，博士研究生，无线电物理专业，E-mail：itmakes@gmail.com
基金资助:
国家重大科学仪器设备开发专项资助项目(2011YQ120035).

A Transmitter Capable of Fast Modulation for NMR Spectrometer-Design and Implementation

MAO Wen-ping^1,2，LI Yun-yan^1,2，LIU Zao¹，BAO Qing-jia^1,3，LIU Chao-yang^1*

1. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Center for Magnetic Resonance (Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences), Wuhan 430071, China; 
2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China

Received:2012-11-02 Revised:2012-11-22 Online:2013-03-05 Published:2013-03-05
Contact: Liu Chao-yang，chyliu@wipm.ac.cn E-mail:itmakes@gmail.com；chyliu@wipm.ac.cn
About author:毛文平(1985-)，男，湖北人，博士研究生，无线电物理专业，E-mail：itmakes@gmail.com
Supported by:
国家重大科学仪器设备开发专项资助项目(2011YQ120035).

摘要/Abstract

摘要：

介绍了一种具有快速幅度、相位和频率调制功能的核磁共振射频发射机. 数字中频子系统中采用了两个级联的数控振荡器，前一级数控振荡器在FPGA内实现，用于产生基带调制信号；后一级则采用具有正交调制功能的DDS芯片，由它来完成基带信号的采样率转换、中频产生、调制和输出. 射频脉冲的相位和频率偏置的设置直接由级联NCO实现，而幅度设置则由步进衰减器和中频幅度调制共同实现. 该发射机的基本性能和功能满足常规1D/2D NMR实验需求.

关键词: 核磁共振波谱仪, 发射机, 软件无线电, 数字中频调制

Abstract:

his paper presents the design and implementation of a radio frequency (RF) transmitter for NMR spectrometer, which is capable of fast modulation of the amplitude, phase and frequency of RF pulses. Two cascading numerically controlled oscillators (NCOs) were used in the digital IF subsystem. The first NCO was implemented in a field programmable gate array (FPGA), generating baseband modulating signal. The second one was a direct digital frequency synthesizer (DDS), which is responsible for sampling rate conversion, IF generation and modulation, and transmission of modulated IF signal. The phase and frequency offset of a RF pulse can be set directly by the cascading NCOs, whereas the amplitude is set by the cascading NCOs and digital step attenuators. It was demonstrated that the basic electrical specifications and function of the transmitter can meet the needs of routine 1D/2D NMR experiments.

Key words: NMR spectrometer, transmitter, software-defined radio, digital IF modulation

中图分类号:

O482.53

毛文平，李云燕，刘造，鲍庆嘉，刘朝阳*. 具有快速调制功能NMR发射机的设计与实现[J]. 波谱学杂志.

MAO Wen-ping，LI Yun-yan，LIU Zao，BAO Qing-jia，LIU Chao-yang*. A Transmitter Capable of Fast Modulation for NMR Spectrometer-Design and Implementation[J]. Chinese Journal of Magnetic Resonance.

参考文献

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具有快速调制功能NMR发射机的设计与实现

A Transmitter Capable of Fast Modulation for NMR Spectrometer-Design and Implementation

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