International Journal on Magnetic Particle Imaging IJMPI
Vol. 12 No. 1 Suppl 1 (2026): Int J Mag Part Imag
https://doi.org/10.18416/IJMPI.2026.2603048

Proceedings Articles, ID 1009

A Low-Noise Differential JFET Amplifier for Magnetic Particle Imaging

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Haozhe WANG (Kyushu University), Egor Kretov (Fraunhofer Research Institution for Individualized and Cell-based Medical Engineering IMTE, Lübeck, Germany), Onurcan Topcu (Fraunhofer Research Institution for Individualized and Cell-based Medical Engineering IMTE, Lübeck, Germany), Florian Thieben (Fraunhofer Research Institution for Individualized and Cell-based Medical Engineering IMTE, Lübeck, Germany), Matthias Graeser (Fraunhofer Research Institution for Individualized and Cell-based Medical Engineering IMTE, Lübeck, Germany), Takashi Yoshida (Department of Electrical and Electronic Engineering, Kyushu University, Fukuoka, Japan)

Copyright (c) 2026 Haozhe WANG, Egor Kretov, Onurcan Topcu, Florian Thieben, Matthias Graeser, Takashi Yoshida

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This work is licensed under a Creative Commons Attribution 4.0 International License.

Abstract

In MPIsystemsdesigned for large areas of the human body, drive fields are a significant source of interference for the receive electronics. Their influence, in addition to the direct feedthrough of the signal, can manifest itself in the form of common-modenoise,whichcanbeeffectively suppressed using filters and low-noise amplifiers with a differential architectures. In this work, we demonstrate a prototype of low-noise amplifier based on differential first stage, which works in combination with four order notch receive filter. Our preliminary results show a gain of at least 40 dB over the frequency range of 50-700 kHz, effectively covering measurable harmonic signals for head sized MPIscanner.

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