微弱信号检测电路PCB的电磁抗干扰仿真分析  

Analysis of Electromagnetic Anti-Interference Simulation of the Weak Signal Detection Circuit's PCB

作　　者：黄年龙[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》2013年第4期572-575,共4页Chinese Journal of Electron Devices

摘　　要：微弱信号检测设备因其自身的特点,对电磁干扰非常敏感。首先对PCB中电磁干扰源以及微弱信号检测电路PCB的抗干扰设计进行分析,然后使用Ansoft Designer对PCB的电磁场进行仿真,得到PCB在50 MHz和100 MHz的近场分布图,最后根据仿真结果对PCB的布局布线进行调整。调整后在50 MHz,电场辐射最大值降低了48%,磁场辐射最大值降低了38%;在100 MHz,电场辐射最大值降低了55%,磁场辐射最大值降低了54%。仿真分析有利于减弱PCB的电磁辐射,从而提高微弱信号检测设备的电磁抗干扰能力。Because of weak signal detection equipments＇ own characteristics, they are very sensitive to EMI（ Electro- Magnetic Interference）. The EMI sources of PCB and its anti-interference design method are analyzed. Then,the electromagnetic field of the PCB is analysed using Ansoft Designer and its near field plots at 50 MHz and 100 MHz obtained. Finally,layout and routes of PCB are adjusted according to the simulation results. After adjustment, the maximum value of electric field radiation and magnetic field radiation have been decreased by 55% and 54% respectively at 50 MHz,and electric field radiation and magnetic field radiation have been decreased by 55% and 54% respectively at 100 MHz. Thus the simulation is helpful for reducing the electromagnetic radiation and improving the anti-EMI ability of weak signal detection equipments.

关 键 词：微弱信号检测 ANSOFT DESIGNER 电磁干扰 近场 

分 类 号：O441[理学—电磁学]