A nanosecond pulse generator based on avalanche transistor

2016 16th International Conference on Ground Penetrating Radar (GPR) Pub Date : 2016-06-13 DOI:10.1109/ICGPR.2016.7572649

K. Zhou, C. Huang, M. Lu

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引用次数: 2

Abstract

Ultra-wideband (UWB) pulse generators based on an avalanche transistor are widely used in time domain ground penetrating radar(GPR). For shallow subsurface detection, it is essential to increase the pulse amplitude while maintaining the pulse width in order to improve the spatial resolution of GPR. Eliminating pulse trailing is also necessary to improve GPR performance. In this paper, a simple nanosecond generator was designed based on an avalanche transistor. The generator consists of a trigger circuit and a two-stage MARX circuit. The trigger signal is produced by the avalanche transistor in the trigger circuit. Resistors between the base and emitter of the transistor (Rbe) in the MARX circuit are optimized to improve the performance of the output pulse. The output characteristics of the generator are studied for different Rbe and charging capacitor. The results prove that optimizing resistors and charging capacitors decreases the width of the pulse and eliminates the pulse trail. A pulse with width of 900 ps and an amplitude of 25.2V was achieved. The RMS time jitter value of the pulse generator was found to be less than 400 ps.

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一种基于雪崩晶体管的纳秒脉冲发生器

基于雪崩晶体管的超宽带脉冲发生器在时域探地雷达中有着广泛的应用。对于浅层探测，必须在保持脉冲宽度的同时增加脉冲幅度，以提高探地雷达的空间分辨率。消除脉冲拖尾也是提高探地雷达性能的必要条件。本文设计了一种基于雪崩晶体管的简易纳秒发生器。发电机由触发电路和两级MARX电路组成。触发信号由触发电路中的雪崩晶体管产生。在MARX电路中，为了提高输出脉冲的性能，对晶体管基极和发射极之间的电阻进行了优化。研究了不同Rbe和充电电容对发电机输出特性的影响。结果表明，优化电阻器和充电电容可以减小脉冲宽度，消除脉冲痕迹。脉冲宽度为900ps，幅值为25.2V。脉冲发生器的时间抖动有效值小于400ps。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2016 16th International Conference on Ground Penetrating Radar (GPR)

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