超快光电导开关的传输特性分析及优化方案  

Analysis and Optimizing Design For Matching Transmission Characteristics of Ultra-Fast Photoconductive Semiconductor Switches

作　　者：王馨梅[1] 纪卫莉[2] 施卫[2] 张苗苗[2] 

机构地区：[1]西安理工大学自动化与信息工程学院,陕西西安710048 [2]西安理工大学理学院,陕西西安710054

出　　处：《西安理工大学学报》2013年第1期8-12,共5页Journal of Xi'an University of Technology

基　　金：国家自然科学基金资助项目(60906029);陕西省教育厅专项科研计划基金资助项目(09JK663);广东省产学研基金资助项目(2011B090400362)

摘　　要：超快光电导开关输出的是超宽带的电脉冲信号,因此开关至负载的传输线路设计优劣对输出波形影响很大。本研究分析了光电导开关典型的同轴-微带传输结构,计算了线性工作模式下开关电阻瞬态变化在传输线路阻抗不连续处引起的电磁波反射,及其对输出脉冲波形和电压传输率产生的影响,然后与实测脉冲波形进行了对比,解释了肩峰现象。最后根据仿真结果提出了提高光电导开关传输特性的三种优化方案。The output of an ultra-fast photoconductive semiconductor switch（PCSS） is ultra-wideband electric pulses,so that the good design of transmission line from the switch to the load has a great effect upon the output waveforms.The coaxial-to-microstrip transition,a classic transition structure of planar PCSS,is analyzed in this paper.Considering the transient resistance of the linear-mode PCSS,the reflections of electromagnetic wave caused at the impedances discontinuity points are calculated.Its influences on the output waveform and on the voltage transmission efficiency are computed.And then,the contrasts are made with the real measured pulse waveforms,thus accounting for the shoulder peak phenomenon.Finally,in accordance with the simulation results,three kinds of optimized schemes of improving PCSS transmission characteristics are suggested.

关 键 词：光电导开关 传输特性 电脉冲 

分 类 号：TN202[电子电信—物理电子学]