A Frequency Synthesizer For High-Field NMR Spectrometers

Chinese Journal of Magnetic Resonance

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A Frequency Synthesizer For High-Field NMR Spectrometers

LIU Hai-dan1,2，WANG Hui-wang1,2，ZHU Tian-xiong1,2，SONG Kan1,2，LIU Chao-yang1*

1. State Key Laboratory of Magnetic Resonance and Atomic 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

Received:2013-04-12 Revised:2013-04-28 Online:2014-03-05 Published:2014-03-05
About author:*Corresponding author：LIU Chao-yang, Tel: 027-87198790, E-mail: chyliu@wipm.ac.cn.
Supported by:
国家自然科学基金资助项目(10675162)，科技支撑计划资助项目(2006BAK03A22)．

Abstract

Abstract:

A frequency synthesizer based on PLL and DDS was designed for high-field NMR spectrometers. An MCU controller with CAN interface is used as the center
processor for the system, which receives instructions from the NMR console and controls the other components to change the power and frequency of the output. The PLL frequency synthesizer is used to get stable and pure signal for mixing, contributing to low phase noise and wide band spanning from 5 to 645 MHz. Combined with DDS, the resolution of the synthesizer can be as high as μHz. This design has many other benefits, including easy control, high precision and low cost.

Key words: NMR, frequency synthesizer, PLL, DDS, low phase noise

CLC Number:

O482.53

LIU Hai-dan1,2，WANG Hui-wang1,2，ZHU Tian-xiong1,2，SONG Kan1,2，LIU Chao-yang1*.

A Frequency Synthesizer For High-Field NMR Spectrometers

[J]. Chinese Journal of Magnetic Resonance.

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A Frequency Synthesizer For High-Field NMR Spectrometers

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