Comparison of via equivalent circuit model accuracy using quasi-static and full-wave approaches

B. Archambeault, S. Connor, Jianmin Zhang, J. Drewniak, M. Lai, A. Orlandi, G. Antonini, A. Ruehli
2004 International Symposium on Electromagnetic Compatibility (IEEE Cat. No.04CH37559)  
The EMC and signal integrity impact of printed circuit board (PCB) trace discontinuities, such as vias, where the signal is transitioned fiom one layer to another in the PCB stackup, have become significant recently with the use of very high speed signals in today's systems. If these discontinuities are ignored, significant distortion of the high speed signal can occur, and in many cases, cause data errors. A fast and accurate technique to include the effect of via discontinuities in the
more » ... ities in the typical design process is needed to ensure thii distortion is considered if significant. Therefore, a simple equivalent circuit for the via discontinuity is needed so that this equivalent circuit can be easily used in the normal signal integrity analysis tools. This paper demonstrates the effect on the equivalent circuit values as the distance between the signal via and the returncurrent via is increased. Also, the fiequency range where a quasi-static based equivalent circuit is accurate or where a full-wave model is required is shown for the various distances between vias.
doi:10.1109/isemc.2004.1349962 fatcat:yugjetkcprgipasva3ofyfwque