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

Chinese Journal of Magnetic Resonance

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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).

Abstract

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

CLC Number:

O482.53

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.

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

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