Design and Implementation of a Frequency Synthesizer with Wide Frequency-Coverage and Low Phase Noise Level

Chinese Journal of Magnetic Resonance ›› 2011, Vol. 28 ›› Issue (2): 207-215.

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Design and Implementation of a Frequency Synthesizer with Wide Frequency-Coverage and Low Phase Noise Level

MEI Jing^1,2, MAO Wen-Ping^1,2, HU Peng^1,2, LI Zheng-Gang¹, CHEN Fang¹, 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. Graduate School of the Chinese Academy of Sciences, Beijing 100049, China

Received:2011-01-13 Revised:2011-02-27 Online:2011-06-05 Published:2011-06-05
Supported by:
国家自然科学基金资助项目（10675162），国家科技支撑计划资助项目（2006BAK03A22）.

Abstract

Abstract:

The design and implementation of a frequency synthesizer with wide-band output frequency spanning, high resolution, and low phase noise level was proposed. The frequency synthesizer contains three sections: 1) a STM32 which serves as the synthesizer’s controller and provides a CAN bus interface for remote frequency control, 2) a clock distribution section which generates fixed frequency references and provides fine output frequency resolution, and 3) a triplemix section which operates in a drift canceling loop and alters the output frequency with a 30 MHz step. The frequency synthesizer design was used on a home-built 500 MHz NMR spectrometer. Its performance was demonstrated by sensitivity tests with ¹H NMR spectroscopy.

Key words: NMR, frequency synthesizer, triple-mix, low phase noise

CLC Number:

O482.53

MEI Jing, MAO Wen-Ping, HU Peng, LI Zheng-Gang, CHEN Fang, LIU Chao-Yang. Design and Implementation of a Frequency Synthesizer with Wide Frequency-Coverage and Low Phase Noise Level[J]. Chinese Journal of Magnetic Resonance, 2011, 28(2): 207-215.

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Design and Implementation of a Frequency Synthesizer with Wide Frequency-Coverage and Low Phase Noise Level

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