差分对非对称性对信号完整性及噪声的影响  

Influence of Asymmetry of Differential Pair on Signal Integrity and Coupling Noise

作　　者：陈建华[1] 周立鹏[1] 李瑛[2] 

机构地区：[1]河南科技大学电子信息工程学院,河南洛阳471023 [2]河南石油勘探局,河南南阳473132

出　　处：《河南科技大学学报（自然科学版）》2013年第4期45-50,56,共7页Journal of Henan University of Science And Technology:Natural Science

基　　金：航空科学基金项目(20100142003)

摘　　要：采用时域有限差分方法及各项异性介质完全匹配层为吸收边界条件,以正弦信号为激励源,研究差分对接收端在理想端接及仅匹配端接差分信号两种条件下,激励信号相位、幅度及差分对的非对称性对接收端信号完整性、对相邻微带耦合噪声的影响。研究结果表明:激励信号及差分对均对称时,相邻微带线的近端耦合噪声幅值远小于远端耦合噪声;负载端理想端接可减小信号源相位、差分对结构的非对称性对信号完整性的影响及激励信号相位不对称对远端噪声的影响,但接收端理想端接并不能有效减小激励信号幅值的非对称性对信号完整性的影响及激励信号幅值、差分对结构的非对称性对远端噪声的影响;差分对非对称性对近端噪声的影响大于激励信号非对称性对其产生的影响。Based on finite difference time domain method ( FDTD) ,a anisotropic perfectly matched absorber was used as an absorbing boundary condition and sinusoidal signals were used as exciting source.Under two conditions that the receiving end of a differential pair was matched perfectly and was matched to differential signal only,the effects of the asymmetric differential pair and exciting signals on signal integrity and coupling noise were studied.The results show that the far-end noise amplitude is much higher than near-end noise when differential pair and exciting signal are both symmetric.Perfect match at receiving end of the differential pair can improve effectively the influences of asymmetric differential pair and exciting signal phase on signal integrity of receiving end.Perfect match can also improve effectively the impact of asymmetries of the exciting signal phase on far-end noise of adjacent microstrip,but perfect match cannot improve effectively the impact of asymmetries of exciting signal amplitude on signal integrity.Perfect match also cannot improve effectively the effect of asymmetric differential pair and exciting signal amplitude on far-end noise.The impact of asymmetries of the differential pair on near-end noise is greater than the asymmetries of the exciting signals do.

关 键 词：时域有限差分 差分对 信号完整性 耦合噪声 

分 类 号：O44[理学—电磁学]