低场磁共振系统的低噪声前置放大器研究设计

doi:10.11938/cjmr20162547

波谱学杂志 ›› 2017, Vol. 34 ›› Issue (3): 383-395.doi: 10.11938/cjmr20162547

• 谱仪研制技术进展专栏 • 上一篇

低场磁共振系统的低噪声前置放大器研究设计

亢科^1,2, 徐雅洁², 张闻文¹, 杨晓冬²

1. 南京理工大学电子工程与光电技术学院, 江苏南京 210094;
2. 中国科学院苏州生物医学工程技术研究所, 江苏苏州 215163

收稿日期:2016-09-12 修回日期:2017-07-17 出版日期:2017-09-05 发布日期:2017-09-05
通讯作者: 杨晓冬,Tel:0512-69588133,E-mail:xiaodong.yang@sibet.ac.cn. E-mail:xiaodong.yang@sibet.ac.cn
基金资助:
中国科学院科研装备研制资助项目（YZ201445）.

Low Noise Pre-Amplifier Design for Low-Field Magnetic Resonance Systems

KANG Ke^1,2, XU Ya-jie², ZHANG Wen-wen¹, YANG Xiao-dong²

1. School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;
2. Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, China

Received:2016-09-12 Revised:2017-07-17 Online:2017-09-05 Published:2017-09-05

摘要/Abstract

摘要： 噪声前置放大器是磁共振射频接收子系统中的重要组件，它的性能优劣直接决定了最终磁共振图像的好坏.目前市场上的低噪声前置放大器大多基于中高场磁共振系统开发，而针对低场磁共振系统的很少；另外，商用低场磁共振系统的低噪声前置放大器价格相对较贵，并且多采用两级放大结构，结构复杂、调试难度大、成本相对较高.在此背景下，针对0.5 T低场磁共振设备利用Keysight公司的先进设计系统（ADS）软件对低噪声前置放大器进行研究设计，采用一级放大结构，探索电路设计与布局对放大器性能的影响.实测结果表明自主设计的低噪声前置放大器在21 MHz共振频率附近噪声系数为0.5 dB左右，增益达到了30 dB，能够满足低场磁共振应用的要求.

关键词: 高增益, 前置放大器, 低噪声, 低场磁共振系统

Abstract: Low noise pre-amplifier is an important component in the radiofrequency (RF) receiving subsystem of magnetic resonance systems. The performance of pre-amplifier determines the quality of the final images directly. Currently, low noise pre-amplifiers on the market mostly are designed for high-field magnetic resonance systems. Few such low noise pre-amplifiers were designed specifically for low-field magnetic resonance systems. Moreover, commercially-available low noise pre-amplifiers are relatively expensive, and most of the designs use a complicated two-stage amplification structure. For these reasons, a low noise pre-amplifier with only one-stage amplification structure was developed in this study for 0.5 T low-field magnetic resonance systems using the advanced design system (ADS) software. The circuit design and layout effects were presented. Experimental measurement showed that the noise figure of on-resonance frequency 21 MHz was about 0.5 dB, and a gain of 30 dB was achieved.

Key words: low-field magnetic resonance systems, low noise, pre-amplifier, high gain

中图分类号:

O482.53

亢科, 徐雅洁, 张闻文, 杨晓冬. 低场磁共振系统的低噪声前置放大器研究设计[J]. 波谱学杂志, 2017, 34(3): 383-395.

KANG Ke, XU Ya-jie, ZHANG Wen-wen, YANG Xiao-dong. Low Noise Pre-Amplifier Design for Low-Field Magnetic Resonance Systems[J]. Chinese Journal of Magnetic Resonance, 2017, 34(3): 383-395.

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低场磁共振系统的低噪声前置放大器研究设计

Low Noise Pre-Amplifier Design for Low-Field Magnetic Resonance Systems

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