高速电路中噪声抑制的研究与测试

发布时间：2018-03-08 14:00

本文选题：信号完整性　切入点：电磁兼容　出处：《深圳大学》2017年硕士论文　论文类型：学位论文

【摘要】：自摩尔定律诞生以来,现代电子系统朝着速度更快,密度更大,功耗更低方向发展,随着IC工艺的不断进步,沟道长度越来越短,导致数字信号的上升时间与下降时间变得越来越小,从而使系统的噪声环境越来越恶劣,如果噪声出现在信号间会引起信号完整性问题(SI),如果出现在电源会带来电源完整性问题(PI),如果布满了整个系统会引起电磁兼容问题(EMC),从而对高速电路系统的稳定性造成了严重的影响。如何解决高速电路系统中的信号完整性、电源完整性、以及电磁兼容问题成为高速电路板能否设计成功的关键因素。本文在深入研究高速电路系统的传输线效应理论基础上,针对现代高速电路系统亟待解决的SI问题,分析了板级系统的反射与串扰问题和电源噪声问题。针对板级系统的反射与串扰问题,本文给出了抑制反射噪声和串扰噪声的措施,并结合板级仿真软件Hyperlynx对抑制反射噪声的措施进行仿真验证;针对电源噪声问题,分析介绍了一种降低电源噪声的设计方法-目标阻抗法。另外,本文还从电磁兼容的角度,分析了高速电路系统产生电磁干扰(EMI)的原因,并给出了抑制电磁干扰的措施。针对高速电路系统中普遍用到的差分对的信号完整性,本文进行了详细深入的研究,获得了差分对的远端串扰的产生机理和相关变化规律,并提出了四种减小差分对远端噪声的方法,而且通过Hyperlynx进行了仿真验证。最后,本文基于GTEM小室,对一款开关电源的电磁干扰(EMI)问题进行测试与整改。不仅找到开关电源产生EMI的根源,并通过接地,滤波,屏蔽等整改手段使开关电源的EMI问题得到改善,最后通过3m法电波暗室验证了基于GTEM小室的测试与整改效果。
[Abstract]:Since the birth of Moore's Law, modern electronic systems have moved towards faster speed, higher density and lower power consumption. With the continuous progress of IC technology, the channel length has become shorter and shorter. The rise and fall time of the digital signal becomes smaller and smaller, which makes the noise environment of the system worse and worse. If noise appears between signals, it will cause signal integrity problems, if it appears in power supply, it will cause power integrity problems. If it is covered with the whole system, it will cause EMC problems, thus it will be stable to high speed circuit system. How to solve the problem of signal integrity in high-speed circuit system, Power integrity and electromagnetic compatibility are the key factors in the design of high speed circuit board. Based on the theory of transmission line effect of high speed circuit system, this paper aims at the SI problem that must be solved urgently in modern high speed circuit system. In this paper, the reflection and crosstalk problems of board level system and the problem of power supply noise are analyzed. In view of the reflection and crosstalk problem of board level system, the measures to suppress the reflection noise and crosstalk noise are given in this paper. Combined with the board level simulation software Hyperlynx, the measures to suppress the reflected noise are simulated and verified, and a design method of reducing the power noise is analyzed and introduced in this paper. In addition, from the point of view of electromagnetic compatibility, the paper introduces a design method to reduce the power noise. The causes of EMI in high speed circuit system are analyzed, and the measures to suppress EMI are given. The signal integrity of differential pairs commonly used in high speed circuit system is studied in detail and deeply in this paper. In this paper, the mechanism of far end crosstalk of differential pair is obtained, and the related variation law is obtained. Four methods to reduce the far end noise of differential pair are proposed and verified by Hyperlynx. Finally, based on the GTEM cell, this paper proposes four methods to reduce the noise of the far end of the differential pair. The problem of electromagnetic interference (EMI) of a switching power supply is tested and rectified. Not only the source of EMI is found, but also the EMI problem of switching power supply is improved by means of grounding, filtering and shielding. Finally, the test and modification effect based on GTEM cell is verified by 3m anechoic chamber.
【学位授予单位】：深圳大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN40;TN03

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