【作者】 高亮；

【导师】 魏兴昌；

【作者基本信息】 浙江大学 ， 工程硕士（专业学位）， 2018， 硕士

【摘要】 随着电子器件集成度越来越高,不同器件的工作频率或其谐波产生重叠,发生相互串扰,进而影响整个系统的正常工作,电磁兼容成为电子产品在设计过程中不可忽视的一个问题。为了在集成电路设计阶段就减少可能出现的电磁兼容问题,降低产品生产加工后的整改风险,我们需要深入研究辐射器件的电磁特性,从而提出有效的等效模型和分析方法。结合业界工程应用,本文主要针对高频高速电子器件在电磁干扰和屏蔽方面进行了建模研究。基于研究背景和现状,本文的主要研究包括以下几个方面:1、对电容等局部元件进行了建模和高频寄生参数误差分析。本文通过基因算法优化电路模型参数,该电路模型能够准确反映出测试情况。由此我们可以建立同一工艺下元件模型参数的数据库,利用该数据库可以对不同参数值的元件做出有效预测。2、对整体辐射模块构建了等效偶极子模型。通过提取器件近场辐射信息,建立了基于切向场的磁偶极子的等效辐射源模型,并以仿真模型与实际器件验证了等效源的准确性。这极大地提升了仿真效率,并且适用于在前期设计中分析模块与周围器件的耦合。3、研究了屏蔽盖屏蔽效能的近场表达模型。屏蔽结构是解决电磁干扰的常用方法,对于辐射器件的屏蔽结构,本文创新地提出了屏蔽效能的近场表达形式。利用近场扫描灵活便捷的优点,我们分析了用近场磁场表示屏蔽效能的公式,并且将近场屏蔽效能与混响室方式测得的远场屏蔽效能进行了比较。二者的一致性验证了所提近场屏蔽效能公式的合理性,从而为电小尺寸屏蔽结构屏蔽效能的测量提供了一种新的有效测试方法。4、研究了屏蔽箱中的等效模型远场辐射评估问题。屏蔽盖和屏蔽箱是两种常见的电磁屏蔽应用场景。本文分析了复杂电磁环境下典型的噪声源和屏蔽机箱电磁辐射场景。对于屏蔽箱大而电路板小这种结构,现有软件仿真中面临着多尺度建模问题。我们以优化算法构建偶极子等效模型来替代辐射源,并验证了在屏蔽箱环境下等效模型远场评估的准确性。更多还原

【Abstract】 With the increasing integration of electronic devices,the working frequency bands of different devices may overlap and crosstalk occur,thereby affecting the normal operation of the entire system.Electromagnetic compatibility has become a problem that can not be neglected in the design process of electronic products.In order to reduce possible EMC problems and reduce the risk of rectification after the production and processing of the integrated circuit,we need to study the electromagnetic characteristics of the radiating devices in depth and propose effective equivalent models and analysis methods.Combined with engineering applications,this paper mainly focuses on high-frequency high-speed electronic devices in the electromagnetic interference and shielding aspects of modeling studies.Based on the research background and current situation,the main research of this paper includes the following aspects:1.The local components such as capacitors were modeled and error analysis of high-frequency parasitic parameters was performed.In this paper,genetic algorithm optimization circuit model parameters,the circuit model can accurately reflect the test case.From this we can create a database of component model parameters under the same process,which makes it possible to effectively predict components with different parameter values.2.An equivalent dipole model is constructed for the whole radiation module.By extracting the near-field radiation information of the device,an equivalent radiation source model based on the tangential magnetic dipole is established,and the accuracy of the equivalent source is verified by the simulation model and the actual device.This greatly increases the simulation efficiency and is suitable for analyzing the coupling of the module to the surrounding devices in the previous design.3.The near-field expression model of shield effectiveness is studied.Shielding structure is a common method to solve electromagnetic interference.For the shielding structure of radiation device,this paper presents a new form of near-field shielding effectiveness.Using the advantage of near-field scanning flexibility and convenience,we analyze the near-field magnetic field to represent the shielding effectiveness,and compare the near-field shielding effectiveness with the far-field shielding effectiveness measured by the reverberation room method.The consistency between the two verifies the rationality of the proposed field-shielding effectiveness formula,and thus provides a new and effective test method for measuring the shielding effectiveness of the small-size shielding structure.4.The problem of evaluating the far-field radiation of the equivalent model in a shielded box is studied.Shielding covers and shielding boxes are two common electromagnetic shielding applications.This paper analyzes the typical EMI sources in a complex electromagnetic environment and shielded enclosure EMI radiation scenarios.For the multi-scale simulation problem that the shield box is large and the circuit board is small,we construct the dipole equivalent model to replace the radiation source by the optimization algorithm and verify the accuracy of the far-field evaluation of the equivalent model in a shielded box environment.更多还原