摘 要：随着集成电路发展速度的不断提升，系统设计的复杂度也在不断增加，PCB（印制电路板）已不是简单的支撑电子元器件的平台，而变成了一个高性能的系统结构，因此信号完整性等因素在板级设计中已成为一个必须考虑的问题。传统的设计流程过分依赖开发者的技术和经验，存在各种不可控因素及资源消耗；在如今的板级设计中，采用电路板级仿真已经成为必然，借助前仿真和后仿真相结合的分析方法，可在发板前尽可能发现和解决设计过程中遇到的信号完整性及电磁兼容性问题，极大地提高系统设计的稳定性，减少因设计缺陷而多次改版的人力成本。本文结合前仿真及后仿真功能，以IBIS 模型为基础，对SDRAM 系统设计中的过冲、辐射及串扰进行针对性仿真探索，以仿真的输出结果指导产品设计，提高了系统稳定性。
关键词：信号完整性；仿真；过冲；串扰；EMC
中图分类号：TN402；TN401 文献标识码：A 文章编号：2096-4706（2019）15-0038-04
Simulation of SDRAM Signal Integrity Based on IBIS Model
LING Jianhong，FAN Panfeng
（ZLG Technology Corp.，Ltd.，Guangzhou 510660，China）
Abstract：With the continuous improvement of integrated circuit speed，the complexity of system design is also increasing. PCB（printed-circuit board） is no longer a simple platform to support electronic components，but a high-performance system structure.Therefore，signal integrity has become a must be considered in the board design. The traditional design process relies too much on the developer’s technology and experience，and there are various uncontrollable factors and resource consumption. In today’s board level design，it is necessary to adopt circuit board level simulation，with the help of the analysis method of combining pre-simulation with post-simulation，can be found as far as possible in front of the plate and solve encountered in the process of design of signal integrity and electromagnetic compatibility issues，greatly improved the stability of the system design，reduce the human cost of multiple revision due to design flaws. Combined with the pre-simulation and post-simulation functions，based on the IBIS model，this paper conducts targeted simulation exploration on the overshoot，radiation and crosstalk in the design of SDRAM system，and guides the product design from the output of simulation to improve the system stability.
Keywords：signal integrity；simulation；overshoot；crosstalk；EMC
参考文献：
[1] 邵鹏. 信号/ 电源完整性仿真分析与实践 [M]. 北京：电子工业出版社，2013.
[2] 王剑宇，苏颖. 高速电路设计实战 [M]. 北京：电子工业出版社，2016.
[3] 毛忠宇，杨晶晶，刘志瑞，等. 信号、电源完整性仿真设计与高速产品应用实例 [M]. 北京：电子工业出版社，2018.
作者简介：凌健鸿（1990.05-），男，汉族，广西玉林人，嵌入式硬件工程师，毕业于闽江学院，学士学位，研究方向：电子信息科学与技术、嵌入式系统设计。