基于信号完整性分析的PCB电路辐射噪声抑制方法  

Radiated EMI Noise Mitigation Based on Signal Integrity Applied for PCB

作　　者：娄鑫霞[1] 赵阳[1] 陈雪丽[1] 张宇环[1] 何雄峰[1] 

机构地区：[1]南京师范大学电气与自动化工程学院,江苏南京210042

出　　处：《南京师范大学学报（工程技术版）》2012年第2期28-31,共4页Journal of Nanjing Normal University(Engineering and Technology Edition)

基　　金：江苏省自然科学基金(BK2011789);毫米波国家重点实验室开放基金(K201106)

摘　　要：针对高速数字电路产生的辐射噪声,利用电磁场散射参数方法建立了PCB信号传输模型,分析了因信号振铃波产生的辐射噪声.此外,利用CST软件提取电路电磁参数,建立相应的等效电路模型,据此对PCB特征阻抗进行终端匹配,有效改善了信号传输特性.理论分析与实验结果表明,采用此方法对某型高清助视器USB端口(主频480MHz)进行阻抗匹配,改善了传输线信号完整性,降低了该设备的辐射噪声,最大可达12dBμV/m且满足GB 9254标准.Signal transmission modal was established by using scattering parameter method for the radiated noise of high speed digital circuit. Mechanism of radiated noise generated by signal ringing wave was analyzed. Furthermore, PCB e- lectromagnetic parameters were extracted by employing CST software, and the equivalent circuit was presented. Signal transmission was improved after matching the characteristic impedance of PCB. Theory analysis and experiment results show that signal （ basic frequency was 480 MHz） in USB cable of HD visual aids was improved. Radiated noise was decreased 12 dBμN/m and can meet GB 9254.

关 键 词：辐射噪声 信号完整性 噪声抑制 散射参数 阻抗匹配 

分 类 号：TP337[自动化与计算机技术—计算机系统结构] TN41[自动化与计算机技术—计算机科学与技术]