Analysis of vias in print circuit board using conformal FDTD method

• Main Authors: De-cheng Chang, 張德成
• Other Authors: Chih-Wen Kuo
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/4h6335

碩士 === 國立中山大學 === 電機工程學系研究所 === 95 === In high –speed digital circuits, in order to utilize the space of printed circuit boards(PCB) efficiently, the signal via is a heavily used interconnection structure to communicate different signal layers. However, the interconnection discontinuities will result in the degradation of the signal integrity and become a crucial issue for IC designers. To analyze this problem using finite difference time domain(FDTD) method, the stair case approach of interesting structure with curved metallic surface not only introduce errors due to inaccurate approximation, but consume much simulation time and memory required . In this thesis, a conformal FDTD method of locally distorted contours is presented. By modification of Maxwell’s equations in integration form, we simulate the signal via successfully and discuss several interesting issues such as resonance in power/ground plane, the simultaneous switching noise(SSN), the effect of adding ground vias in PCB, and common-mode and differential-mode drives for source, etc.