耦合传输线信道传输矩阵建模及串扰抵消效果分析

针对高速互连系统中传输线上的串扰问题，基于电磁耦合理论，研究了耦合传输线信道传输矩阵的性质，建立了以下两种情况的耦合传输线信道传输矩阵模型及其矩阵分解形式，分别是：（1）考虑受扰线两边各一条相邻微带线对受扰线的串扰；（2）考虑受扰线两边各两条相邻微带线对受扰线的串扰.给出了上述两种情况下基于耦合传输线信道传输矩阵分解形式的串扰抵消方案，并利用仿真工具ADS对其进行了验证.结果表明：信号抖动和失真大幅下降，串扰抵消效果良好，并且第二种情况下的串扰抵消效果优于第一种情况.该结果说明了在基于耦合传输线信道传输矩阵进行串扰抵消时，考虑两边各两条相邻微带线的串扰效果较好，对保持高速信号完整性具有一定的实际应用价值.

Modeling of Transmission Matrix and Crosstalk Cancellation Method and Effect Analysis of Coupled Transmission Line

To resolve the crosstalk problem of the transmission lines in high-speed interconnection system,the properties of the transmission matrix are studied.Both the model of the transmission matrix and the matrix decomposition form are established in the following two cases,one is the crosstalk between the disturbed line and its one adjacent microstrip line on both sides,and the other is the crosstalk between the disturbed line and the two adjacent lines on both sides.The crosstalk cancellation scheme for the above two cases is given,and it is verified with the advanced design system (ADS).The results show that both signal jitter and distortion are greatly improved,the crosstalk is obviously cancelled,and it is illustrated that the crosstalk cancellation effect of the scheme considering two adjacent microstrip lines is better than that of one adjacent microstrip line.It is practical to maintain the integrity of the high-speed signal.