基于有限元方法的ARM11核心板电源完整性分析  

Power Integrity Analysis of ARM11 Core Board Based on FEM

作　　者：沈敏[1] 吴明赞[1] 李竹[1] 

机构地区：[1]南京理工大学自动化学院,南京210094

出　　处：《电子器件》2014年第3期422-425,共4页Chinese Journal of Electron Devices

摘　　要：ARM11核心板属于高速电路板,在设计中需要降低电源配送网络(Power Delivery Network)的输入阻抗来提高电源完整性。基于有限元方法对10个晶体管产生的同步开关噪声(Simultaneous Switching Noise)、调整前后PDN的直流/交流特性进行仿真,仿真结果表明:10个晶体管同时开关时芯片电源电压波动达7.9%;1.2 V PDN的直流电压从1.17 V增加到1.18 V,PDN的电流密度整体得到降低;在397 MHz谐振频率处PDN的谐振现象得到减弱;因此当达到10个晶体管同时开关时芯片电源电压已不满足要求,在对PDN调整后最终降低了PDN的输入阻抗和电压波动。ARM11 core board belongs to high-speed circuit board, and during the design we need to reduce input impedance of PDN （ Power Delivery Network ） to improve power integrity. SSN （ Simultaneous Switching Noise ） produced by 10 transistors and DC/AC Characteristics of PDN before and after adjustment are simulated based on FEM,the simulation results indicate that chip power voltage fluctuation reaches 7.9% when 10 transistors switch simultaneously ;DC vohage of 1.2 V PDN is increased from 1.17 V to 1.18 V, current density of PDN is reduced integrally; Resonance phenomenon of PDN is weakened at the frequency of 397 MHz;So chip power voltage hasn＇t satisfied the requirements when 10 transistors switch simultaneously, after PDN is adjusted ,the input impedance and voltage fluctuation of PDN is reduced finally.

关 键 词：电源完整性 PDN 有限元方法 SSN 谐振 

分 类 号：TN86[电子电信—信息与通信工程]