时域反射计取样系统中单极性脉冲的设计  

The design of unipolar pulse of TDR sampling system

作　　者：曹晓丽[1] 白泰礼 Cao Xiaoli;Bai Taili(School of Electronics and Information Engineering,Sias International University,Zhengzhou 451100,China;School of Aeronautics and Astronautics,University of Electronic Science and Technology of China,Chengdu 611731,China)

机构地区：[1]郑州大学西亚斯国际学院电子信息工程学院,郑州451100 [2]电子科技大学航空航天学院,成都611731

出　　处：《河南师范大学学报（自然科学版）》2018年第3期40-45,67,共7页Journal of Henan Normal University(Natural Science Edition)

基　　金：河南省科技攻关项目(162102210110)

摘　　要：在时域反射计(TDR)取样系统中,单极性脉冲是用于开启取样门的关键信号.通过分析比较提出了一种基于雪崩三极管与阶跃恢复二极管(SRD)整形相结合的单极性脉冲发生电路.该电路避免了高压驱动等缺点,在保持脉冲幅度的前提下又得到了有效的脉冲底宽,通过实际的电路测试得到的单极性脉冲具有极宽的频谱、有效的脉冲宽度和幅度,符合取样系统的要求.In the sampling system of TDR,unipolar pulse is the key signal to open sampling gate.In this paper,an unipolar pulse generating circuit based on the avalanche triode and SRD shaping is proposed by analyses and comparsons.This circuit avoids the disadvantages such as high-voltage driving,and obtains the effective pulse bottom width under maintaining the pulse amplitude.In testing,the unipolar pulse with wide frequency spectrum,effective

关 键 词：三极管 雪崩 超宽带脉冲 阶跃恢复二极管 取样 

分 类 号：TN784[电子电信—电路与系统]