基于ADS2009的特性阻抗测试仪高速脉冲源的设计

Design of the High Speed Pulse Source in the Characteristic Impedance Tester Based on ADS2009

简要阐述了特性阻抗测试技术的基本原理,主要分析了阻抗测试系统的主要组成部分即脉冲源的设计。文中根据阶跃恢复二极管的整形特性设计了一款上升时间达到99.61ps的脉冲源,利用安捷伦的软件ADS2009对设计的脉冲源电路和电路中的关键元器件SRD的动态性能进行了仿真,仿真所得的结果符合IPC-TM-650规范对特性阻抗测试仪脉冲过冲与振铃的要求。

This paper briefly introduced the basic principles of the characteristic impedance test technology, and ana- lyzed the design process of the pulse source which is the main part of the impedance test system. A very fast rise time pulse source which is 99.61ps is designed based on the shaping property of the step recovery diode, it employs the software ADS2009 to simulate the pulse source circuit and the dynamic performance of SRD which plays the key role in the circuit. The overshooting and ringing meet the desired objectives of IPC -TM -650