电路的电磁兼容性研究 毕业论文.doc

电路的电磁兼容性研究 Research of Electromagnetic Compatibility in circuit 专 业：电子信息科学与技术 学 号姓 名：李小会 指导教师：张 静 内容摘要 电路的电磁兼容性是指其在一个电磁环境中能正常工作的适应能力.电磁兼容性设计是提高产品可靠性的技术途径之一，提高电路的电磁兼容性有利于提高整个电子设备的可靠性. 本文就实际工程中普遍存在的电磁干扰问题,结合电磁兼容思想,从电磁干扰的产生、种类以及耦合途径出发,对电路的电磁兼容性设计方法进行了总结和归纳。介绍了从印制电路板的选取到元器件的布置以及地线、电源线和信号线的设计中减少电磁干扰的设计方法。电磁兼容防护性设计中的滤波技术和接地技术,也做了较详细的分析。根据具体情况提出抑制各种干扰及工程设计的方法. 关键词: 电磁兼容，干扰源，印制电路板，模拟电路，数字电路， 噪声，信号干扰，时钟干扰 Abstract Electromagnetic compatibility of electric circuit is that it has the ability of adapting to run normally in the environment of the electromagnetism. The designing of electromagnetic compatibility is one of the way to improving the reliable technology of the articles; it is good for improving the electromagnetic compatibility of electric circuit to improve the reliability of all the electric equipment. Aiming at the universal Electromagnetic interference EMI problems in reality this paper summarizes the design measures in circuit based on EMC conception according to EMI sources sorts and coupling approaches. A design method of reducing electromagnetic interference, including the choice of PCBs, the arrangement of elements, the design of ground traces, main traces and signal traces is also introduced. For the defense designing of electromagnetic compatibility, the article elaborately analyses the designing of filter at waves and adjoining the earth. In according to elaborate conditions, the article relatively put forward to the measures of retarding all kinds of interrupting and the method of engine designing. Key words: electromagnetic compatibility，interference sources，PCB ，analog circuits， digital circuit， noise， signal interference，clock interference 目 录 内容摘要…………………………………………………………..Ⅱ Abstract…………………………………………………………...Ⅲ 第一章 引言………………………………………………………..1 第二章 电路产生的电磁干扰……………………………………………2 §2.1一些电磁干扰现象………………………………………………...2 §2 .2电路中的干扰主要来源…………………………………………….3 第三章 对电路产生电磁干扰的因素 ……………………………………...3 第四章 抑制电磁干扰的措施……………………………………………3 §4 .1干扰传输通道抑制…………………………