微带线返回路径非连续性对信号及噪声的影响  

Effects of Return Path Discontinuity of Microstrips on Signal Integrity and Coupling Noises

作　　者：陈建华[1] 牛中奇[1] 

机构地区：[1]西安电子科技大学电子工程学院,陕西西安710071

出　　处：《中北大学学报（自然科学版）》2009年第4期376-380,共5页Journal of North University of China(Natural Science Edition)

基　　金：国家自然科学基金资助项目(30470429)

摘　　要：基于时域有限差分方法(Finite-Difference Time-Domain,FDTD),采用单轴各项异性介质完全匹配层为吸收边界条件,以高斯脉冲为激励源,在激励微带线与静态微带线内边缘间距不变,激励源及负载与微带线特性阻抗相匹配的情况下,对不同微带及返回路径宽度,不同介质基板厚度和相对介电常数的微带线,研究激励微带线激励端和负载端的信号完整性,静态微带线近端和远端的耦合噪声特征,微带线返回路径的非连续性对上述特征的影响以及返回路径非连续性参数改变时上述影响的变化.结果表明:微带线参数对信号完整性及耦合噪声有较大的影响,当返回路径具有非连续性时,其宽度的增加可改善信号的完整性,减小耦合噪声.Based on the finite difference time domain method （FDTD）, a perfectly matched monoaxial anisotropic absorber was adopted as absorbing boundary condition and a Gauss pulse was used as the exciting source. With the space between the inside edges of active and quiet microstrips being constant, and with the exciting source and loads matching to the impedance of microstrips, the effects of the widths of microstrips and return path, the thickness and relative permittivity of dielectric substrate on signal integrity of the active line and coupling noises of the quiet line were analyzed firstly. And then the influences of discontinuity of return path of microstrips with different PCB parameters on the signal integrity and coupling noises were studied. Finally changes of the influences were investigated when the discontinuity varied. The experimental results show that the parameters of microstrips have great effects on the signal integrity and coupling noises, increase of the return path width can improve the signal integrity and decrease coupling noises when the return path is discontinuous.

关 键 词：时域有限差分 非连续性 信号完整性 耦合噪声 

分 类 号：O444[理学—电磁学]