A Balanced T/R Switch for Wideband NMR Front-End

被引：1

作者：

Xu, Juncheng ^{[1
]}

Yao, Shouquan ^{[1
]}

Song, Yiqiao ^{[2
,3
]}

Li, Jianqi ^{[1
]}

Jiang, Yu ^{[1
]}

机构：

[1] East China Normal Univ, Sch Phys & Elect Sci, Key Lab Magnet Resonance, Shanghai 200062, Peoples R China

[2] Massachusetts Gen Hosp, Athinoula A Martinos Ctr Biomed Imaging, Dept Radiol, Charlestown, MA 02129 USA

[3] Harvard Univ, John A Paulson Sch Engn & Appl Sci, Cambridge, MA 02138 USA

来源：

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS | 2024年 / 71卷 / 05期

关键词：

T/R switch; ultra-wideband; dead time reduction; PIN diode; common mode choke; BROAD-BAND;

D O I：

10.1109/TCSII.2023.3348798

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The transmit/receive (T/R) switch is crucial for the front-end of multi-nuclei nuclear magnetic resonance (NMR) spectrometers. However, the common designs of T/R switch nowadays are either inherently narrowband and/or have relatively long dead time, which significantly limits the overall system performance. To address this issue, we developed a PIN-diode-based T/R switch which features an active balanced receive path and a passive transmit path. A prototype of the T/R switch was constructed and experimentally characterized. The measurement results demonstrate that the switch has a bandwidth ranging from 10 to 330 MHz, maintaining an insertion loss from 0.09 to 0.18 dB and isolation from 54.1 to 83 dB. Moreover, the switch exhibits a very short turn-on dead time of 661.1 ns with a transient voltage of 3.3 mV and a turn-off dead time of 313.3 ns. The proposed design offers significant improvements in performance compared to existing T/R switch designs for multi-nuclei NMR spectrometers.

引用

页码：2834 / 2838

页数：5

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