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

doi:10.11938/cjmr20162547

Chinese Journal of Magnetic Resonance ›› 2017, Vol. 34 ›› Issue (3): 383-395.doi: 10.11938/cjmr20162547

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

Abstract

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

CLC Number:

O482.53

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

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