波谱学杂志2017，Vol.34Issue(3)：383-395,13.DOI:10.11938/cjmr20162547
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
摘要
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.关键词
低场磁共振系统/低噪声/高增益/前置放大器Key words
low-field magnetic resonance systems/low noise/high gain/pre-amplifier分类
数理科学引用本文复制引用
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):383-395,13.基金项目
中国科学院科研装备研制资助项目(YZ201445). （YZ201445）
