高速互连总线结构中多平行传输线间的串扰分析与控制

Analysis and control of crosstalk between multi-parallel transmission lines in high-speed interconnect bus structure

随着数字芯片和系统的时钟频率不断提高,串扰成为高速互连系统设计、分析中不容忽视的严峻问题。为研究串行总线结构中多平行传输线间串扰的影响,分析了电信号传输时串扰产生的机理,采用信号完整性分析软件Hyperlynx,构建了三平行传输线串扰模型和总线电路模型,研究了不同模型中控制多平行传输线间串扰噪声的方法。仿真验证结果表明,增加传输线间距、减小介质层厚度、进行端接匹配可以明显减小平行传输线间的串扰。最后提出了减小总线电路模型中抑制串扰噪声干扰的相应措施。

With the increasing clock frequence of digital chip and system, crosstalk problems become a serious problem that can＇ t be ignored in the design and analysis of the high-speed interconnect system. In order to study the impacts of erosstalk between multi-parallel transmission lines in the bus structure, this paper analyzed the mechanism of crosstalk in signal transmission and established a three parallel transmission line erosstalk model and bus circuit mode based on the dissection of Hypedynx, studied on the control method of crosstalk noise between multi-parallel transmission line in different model. The simulation results show that it can reduce the crosstalk by increasing transmission line spacing, reducing the thickness of the dielectric layer and conducting termination match. Finally,it put forward＇ the corresponding measures to suppress crosstalk noise of the bus circuit mode.