全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

高场核磁共振波谱仪频率合成器设计

, PP. 91-99

Keywords: 核磁共振(NMR),频率合成器,锁相环,直接数字合成,低相位噪声

Full-Text   Cite this paper   Add to My Lib

Abstract:

提出了一种基于锁相环(Phase-lockedLoop,PLL)与直接数字合成(DirectDigitalSynthesis,DSS)等技术相结合的高场核磁共振波谱仪频率合成器设计方案.该系统以单片机为控制器完成算法运行、参数配置和CAN总线通信功能,运用PLL技术和DDS技术相结合的频率合成方案,通过两次混频,使频率粗调和细调灵活可控,实现宽带低噪声频率输出.将该频率合成器用于自主研制开发的核磁共振波谱仪上进行实验验证,测试得到的线形和灵敏度均达到指标要求,结果证明该设计方案具有可行性.

References

[1]  Instruction Manual PTS160 [EB]. Programmed Test Sources Inc, 1978.
[2]  Mao W P, Bao Q J, Yang L, et al. A modularized pulse programmer for NMR spectroscopy[J]. Meas Sci Technol, 2011, 22: (025901).
[3]  Yang Liang(杨亮), Bao Qing-jia(鲍庆嘉), Mao Wen-ping(毛文平), et al. System performance evaluation of self-developed NMR spectrometer(自主研制核磁共振波谱仪的性能评估)[J]. Chinese J Magn Reson(波谱学杂志), 2012, 29(1): 78-85.
[4]  RM0008 Reference Manuals [EB/OL]. STMicroelectronics group of companies, 2009. http://www.st.com.
[5]  Li Zhen-gang(李正刚), Zhang Zhi(张志), Mao Wen-ping(毛文平), et al. Application of CAN bus in NMR spectrometer(CAN 总线在核磁共振波谱仪中的应用)[J]. Chinese J Magn Reson(波谱学杂志), 2011, 28(1): 59-66.
[6]  Li Ning(李宁).Development and Application of the MDK-Based STM32 Processor(基于MDK 的STM32 处理器开发应用)[M].Beijing(北京): Beijing University of Aeronautics and Astronautics Press(北京航空航天大学出版社), 2008.
[7]  Floyd M Gardner. Phaselock Techniques(3rd ed)[M]. Wiley-Interscience, 2005.
[8]  Zhuang Hui(庄慧), Huang Su-hua(黄苏华). Yuan Guo-chun(袁国春). Phaselock and Frequency Synthesize Techniques(锁相与频率合成技术)[M]. Beijing(北京): China Meteorological Press(气象出版社), 1996.
[9]  Mei Jing(梅径), Mao Wen-ping(毛文平), Hu Peng(胡鹏), et al. Design and implementation of a frequency synthesizer with wide frequency coverage and low phase noise level(宽带低噪声频率合成器的设计与实现)[J]. Chinese J Magn Reson(波谱学杂志), 2011, 28(2): 207-215.
[10]  Hu Peng(胡鹏), Yang Liang(杨亮), Hu Shao-bin(胡少斌), et al. Design and implementation of NMR receiver(核磁共振波谱仪接收机的设计与实现)[J]. Chinese J Magn Reson(波谱学杂志), 2011, 28(1): 42-49.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133