新一代手机设计中的emi问题与案例研究-emi problem and case study in new generation mobile phone design.docxVIP
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新一代手机设计中的emi问题与案例研究-emi problem and case study in new generation mobile phone design
新一代手机设计中的 EMI 问题与案例分析摘 要随着电气电子行业的迅猛发展,以及无线电事业的迅速崛起,手 机不仅满足了最基本的通话需求,还将要发展成为“个人移动智能终 端”。就目前来看,3G 智能手机已集蓝牙(BT)、无线局域网(Wifi)、 全球定位系统(GPS)于一身,还有很多其他不同的应用功能,这势 必会给原本就资源紧张的手机主板空间带来更大的挑战,产生更多的 电磁干扰问题。将来,手机和电脑的融合也将使电磁干扰问题日趋严 重。因此,如何分析和解决这些问题,以及设计一款在电磁兼容方面 高性能的手机产品是本论文的主要工作。本文先介绍了手机的 EMC 标准法规,并对手机的系统框图进行 简要介绍。第三章阐述了信号完整性和电源完整性方面的内容,包括 反射、串扰、轨道塌陷和地弹噪声等。然后通过对电磁干扰源和干扰 模式的分析,总结了电磁干扰的抑制技术,包括滤波、接地、屏蔽以 及 PCB 设计时的 EMC 原则。第四章先介绍了手机设计时的 EMC 设 计流程,然后针对手机上不同的电磁干扰问题进行分析,并给出行之 有效的解决对策,接着介绍了多无线系统共存时的设计原则。在实际工程应用中,本论文对手机硬件设计工程师尤其是射频工 程师来说,将十分具有指导意义。关键词(四号黑体):电磁干扰、辐射发射、传导发射、接地、地弹、轨道塌陷ITHE EMI PROBLEMS AND THE CASE ANALYSIS IN A NEW GENERATION OF MOBILE PHONE DESIGNABSTRACTWith the rapid development of electrical and electronic industry,and the rapid rise of radio enterprise,mobile phone not only meets the basic needs of the call,but also will develop into a “personal mobile intelligent terminal”. At present,3G smart phone is all-in-one multi-wireless system, such as Bluetooth(BT)、wireless local area network(Wifi)、Global Positioning System(GPS),and so on. It will bring greater challenge to the already strained resources of mobile phone main board space,and will cause more electromagnetic interference problems. In the future,theintegration of mobile phone and computer will also make electromagnetic interference problems becoming more and more serious. Therefore,the main work of this paper is how to analyze and solve these problems,andhow to design a high performance product in terms of electromagnetic compatibility.This paper first introduces EMC standards and regulations and briefly introduces system block diagram for mobile phone. The third chapterdescribes the signal integrity and the power integrity,such as reflection,crosstalk,rail collapse and ground bounce noise. Then,electromagnetic interference source and interference pattern is analyzed , and the suppression technology of electromagnetic interference is summarized, including filtering,grounding,shielding and the EMC principle
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