基于有限元方法的ARM11核心板信号完整性分析

ARM11核心板属于高速电路板,在设计中分析信号完整性问题是不可避免的。借助基于有限元方法的AnsoftSIwave仿真软件对ARM11核心板的关键信号线进行反射和串扰的仿真,使反射产生的过冲幅值和串扰幅值分别控制在驱动电压的10%和5%以内。在采取抑制措施后,过冲幅值从897 mV降至90 mV,串扰幅值从462 mV降至78 mV。仿真结果表明:反射和串扰对信号的影响明显减小,有限元数值计算方法能有效地解决高速电路板的信号完整性问题。

Signal Integrity Analysis of ARM11 Core Board Based on FEM

This paper simulates and analyses the ARM11 core board. By using finite element method to simulate the reflection and crosstalk of critical signal lines, we aim to control the reflection noise under 10% (330mV) and the crosstalk noise under 5% (165mV). The simulation results indicate that the result obtained from the established finite element model accord with the theory analysis when we simulate the signal integrity of high-speed circuit board, and it is effective to analyse the signal integrity by using numerical methods for electromagnetic fields.