《allegro_PCB_SI仿真》-毕业论文设计（学术).doc

【摘要 随着微电子技术和计算机技术的不断发展，信号完整性分析的应用已经成为解决高速系统设计的唯一有效途径。借助功能强大的Cadence公司SpecctraQust仿真软件，利用IBIS模型，对高速信号线进行布局布线前信号完整性仿真分析是一种简单的分析方法，可以发现信号完整性问题，信号完整性相关问题上做出优化的设计从而缩短设计周期(SI)的相关问题，基于信号完整性分析的PCB设计方法，传输线基本理论，详尽的阐述了影响信号完整性的两大重要因素—反射和串扰的相关理论并提出了减小反射和串扰得有效办法。讨论了SpecctraQucst的仿真模型的建立并对仿真结果进行了分析研究结果表明在高速电路设计中采用基于信号完整性的仿真设计是可行的, 也是必要的关键字 高速PCB、信号完整性 Abstract With the development of micro-electronics technology and computer technology，application of signal integrity analysis is the only way to solve highspeed system design. By dint of SpecctraQuest which is a powerful simulation software, it’s a simple and doable analytical method to make use of IBIS model to analyze signal integrity on high-speed signal lines before component placement and routing. This method can find out signal integrity problem and make optimization design on interrelated problem of signal integrity. Then the design period is shortened. In this paper，, PCB design based on signal integrity, transmission lines basal principle are introduced summarily．The interrelated problem of reflection and crosstalk which are the two important factors that influence signal integrity is expounded. It gives effective methods to reduce reflection and establishment of emulational model based on SpecctraQucst is discussed and the result of simulation is analysed. The researchful fruit indicates it’s doable and necessary to adopt emulational design based on signal integrity in high-speed electrocircuit design. Key Words High-speed PCB、Signal integrity、Transmission lines、reflect、crosstalk、simulation 目录 ………………………………………………………………………5 第章 Candence Allegro PCB简介…………………………………………….1 高速PCB的设计方法…………………………………………………….2 SpecctraQuest Interconnect Designer在高速信号印刷板设计中的应用.3 PCB板的SI仿真分析……………………………………………………第章 信号完整性分析……………………………………………………12 3.1 信号完整性（Signal Integrity）……………………………………12 3.2 信号完整性的引发因素………………………………………………….12 3.3 信号完整性的解决方案………………………………………………….14 第四章 传输线原理………………………………