A high isolation switching unit for MRI system

Yingchun Xiao, Zhengyu Zhao, Zuping Qian, Hao Zhou
<span title="">2010</span> <i title="Elsevier BV"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/5i4djr4tgnbobnjegejzpw7nny" style="color: black;">Procedia Engineering</a> </i> &nbsp;
The magnetic resonance imaging (MRI) system mainly consists of a large powerful magnet, a high power frequency tunable RF source, several receivers, L-C parallel resonance circuits, timing control unit, signal processing unit and a T/R switching unit. In order to protect the receivers from overload, and to obtain clear images the switching unit should meet the several requirements: low insertion, high isolation and fast switching speed. Such a switching unit with 1.5 Kilowatts handling
more &raquo; ... y is presented employing PIN diodes as key elements. This paper consists of four parts. 1) how to specify a PIN diode; 2) how to drive a PIN diode, and then presents a new method to drive PIN diode. It is no need to utilize neither optocoupler nor isolated power; 3) how to design a switch employing PIN diodes. 4) A simulation for the switch was performed to analyze its approximately specifications in advance and some measured results of the actual switch are shown.
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