一种用于移动核磁共振系统的紧凑型D类射频功率放大器。

A compact Class D RF power amplifier for mobile nuclear magnetic resonance systems.

作者信息

Zhen J, Dykstra R, Eccles C, Gouws G, Obruchkov S

机构信息

Centre for Energy, The University of Western Australia, Perth 6009, Australia.

School of Engineering and Computer Science, Victoria University of Wellington, Wellington 6012, New Zealand.

出版信息

Rev Sci Instrum. 2017 Jul;88(7):074704. doi: 10.1063/1.4994734.

DOI:10.1063/1.4994734

PMID:28764537

Abstract

A 20 MHz Class D amplifier with an output of 100 W of RF power has been developed. The compact size printed circuit board area of 50 cm and efficiency of 73% make it suitable for mobile nuclear magnetic resonance (NMR) systems. Test results show that the rise and ring down times of the amplifier are less than 0.2 μs, and it is capable of producing constant amplitude pulses as short as 2 μs. Experiments using a Carr Purcell Meiboom Gill pulse sequence with a NMR MOUSE sensor confirm that the Class D amplifier is suitable for mobile NMR applications.

摘要

已开发出一款输出100瓦射频功率的20兆赫兹D类放大器。其紧凑的尺寸（印刷电路板面积为50平方厘米）和73%的效率使其适用于移动核磁共振（NMR）系统。测试结果表明，该放大器的上升和下降时间小于0.2微秒，并且能够产生短至2微秒的等幅脉冲。使用带有核磁共振鼠标传感器的Carr Purcell Meiboom Gill脉冲序列进行的实验证实，该D类放大器适用于移动核磁共振应用。