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2022 IEEE International Symposium on Electromagnetic Compatibility & Signal/Power Integrity (EMCSI)最新文献

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Evolutionary Algorithms as a Tool for Shielding Design 进化算法作为屏蔽设计的工具
S. Kovár, Iva Kavankova, M. Renzler, Jan Valouch, T. Kadavy, D. Mair
The paper deals with the shielding enclosure design using evolutionary algorithms without predetermined conditions. The designed shield consists of an array of elements that rep-resent conductive or non-conductive parts. The expected output is to design a shield with sufficient balance between shielding effectiveness and transparency in systems that need an optical line of sight. The wide frequency transparent shielding design is a complex task that researchers so far mostly solved by composite polymers. The authors use a different approach using traditional conductive material and element folding technology. Element assembly is performed by an evolutionary algorithm that decides the properties of the material used and creates the optimal structure to achieve the desired results. The paper describes the design concept for planar shielding with metaheuristics and the preliminary results.
本文用进化算法研究了无预定条件下屏蔽罩的设计问题。所设计的屏蔽由一组代表导电或非导电部件的元件组成。预期的结果是在需要光学瞄准线的系统中设计一种在屏蔽效果和透明度之间具有足够平衡的屏蔽。宽频透明屏蔽设计是一项复杂的任务,迄今为止研究人员主要通过复合聚合物来解决。作者使用了一种不同的方法,使用传统的导电材料和元件折叠技术。元件组装由进化算法执行,该算法决定所用材料的特性,并创建最佳结构以实现预期的结果。本文介绍了平面屏蔽的元启发式设计思想和初步结果。
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引用次数: 1
A Fast Cascading Method for Predicting the Coupling from External Plane Waves to PCBs 预测外部平面波与pcb耦合的快速级联方法
Shengxuan Xia, James D. Hunter, Aaron Harmon, M. Hamdalla, Ahmed M. Hassan, C. Hwang, V. Khilkevich, D. Beetner
The radio frequency (RF) coupling to electronic devices impacts their EMC performance. The functionalities of a working electronic device may be disrupted when the electromagnetic (EM) coupling reaches a certain level. Studies of the EM coupling to printed circuit boards (PCBs) are therefore essential for RF susceptibility and EMC purposes. For decades, researchers focused on the analytical modeling of EM coupling to transmission lines. However, when it comes to more realistic PCBs the analysis usually still relies heavily on full-wave simulations because of the complexity of the structures and the lack of analytical solutions. Using a traditional full-wave modeling approach, however, could take hours to investigate the EM coupling from the external plane wave to the structure for one incident angle of arrival and polarization. In this paper, we present a methodology using reciprocity that allows for rapid estimation of the voltage induced in the terminations for multiple incident angles of the incoming plane wave and load values based on just one full-wave simulation. This reciprocity-based method is combined with a segmentation technique to enable the capability of studying the coupling to more realistic PCBs. For the cases studied here, estimates could be found in minutes using this approach rather than hours using a full-wave simulation. Estimates were within 2–3 dB of estimates using full-wave simulations for a simple trace structure. Accuracy was not as good for individual angles of arrival of an incident RF wave to a complicated structure including two integrated circuit (IC) packages connected by a trace, but statistical estimates of coupling were within 2–3 dB.
电子设备的射频耦合影响电子设备的电磁兼容性能。当电磁耦合达到一定程度时,工作中的电子设备的功能可能会受到干扰。因此,研究电磁与印刷电路板(pcb)的耦合对于射频敏感性和电磁兼容的目的是必不可少的。几十年来,研究人员一直致力于电磁与传输线耦合的分析建模。然而,当涉及到更现实的pcb时,由于结构的复杂性和缺乏分析解决方案,分析通常仍然严重依赖全波模拟。然而,使用传统的全波建模方法,可能需要花费数小时来研究外部平面波到一个入射角度和偏振的结构的电磁耦合。在本文中,我们提出了一种使用互易性的方法,该方法允许快速估计输入平面波的多个入射角的终端感应电压和基于一个全波模拟的负载值。这种基于互性的方法与分割技术相结合,使研究耦合到更实际的pcb的能力。对于这里研究的案例,使用这种方法可以在几分钟内得到估计,而使用全波模拟则需要几个小时。对于简单的迹线结构,使用全波模拟的估计误差在2-3 dB以内。对于包括两个集成电路(IC)封装在内的复杂结构,入射射频波的各个到达角度的精度不是很好,但耦合的统计估计在2-3 dB以内。
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引用次数: 1
A Low EMI characteristic of LPDDR5 SDRAM with Edge-placed PADs and Short Re-Distribution Lines 边置pad和短再分配线的LPDDR5 SDRAM的低EMI特性
Jun-Bae Kim, Chang-Ki Kwon, Sangwook Park, Y. Sung, Jeong-Don Ihm, Wooyoung Kim, Jungho Jin, Sang-Jun Hwang, C. Yoo, J. Choi, Jingook Kim
For mobile DRAM, low EMI (Electro-Magnetic Interference) chip architecture is highly required. So, mobile DRAM's EMI characteristic using center-placed pads and edge-placed pads has been investigated. Our near-field scan measurement results show that the peak H-field magnitude of LPDDR5 using edge-placed pads is lower by 11.5 dB than that of the other one using center-placed pads. Furthermore, when comparing our measurement results to our simulation results showing that the power plane resonance of PoP (Package-on-Package) affects low frequency EMI radiation significantly, we have also noticed reasonable agreement on the peak H-field magnitude trend.
对于移动DRAM来说,对低EMI(电磁干扰)芯片架构的要求很高。因此,研究了移动DRAM中置衬垫和边置衬垫的电磁干扰特性。我们的近场扫描测量结果表明,使用边缘衬垫的LPDDR5的峰值h场大小比使用中心衬垫的LPDDR5的峰值h场大小低11.5 dB。此外,当将我们的测量结果与模拟结果进行比较时,我们发现PoP (Package-on-Package)的功率平面共振显著影响低频EMI辐射,我们也注意到峰值h场幅度趋势的合理一致性。
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引用次数: 0
Model of the Influence of Interference of a 25 kV 50 Hz Traction Network on Parallel 50 Hz Track Circuits 25kv 50hz牵引网络干扰对并联50hz轨道电路影响的模型
V. Havryliuk
The problem considered in the work is related to ensuring the electromagnetic compatibility of track circuits with a parallel traction network. To evaluate the influence of interference from the alternating current traction network on the operation of the track circuits a simplified model has been developed. The model is based on the well-known multiconductor transmission line method, however, its use for modeling a traction network is difficult due to the longitudinal structural inhomogeneity of the traction system. The simplification proposed in the work assumes that the track circuit equipment connected to the rails insignificantly influence on the distribution of currents in traction network conductors. These assumptions make it possible to neglect the equipment of track circuits at the first stage of modeling, which greatly simplifies the equivalent circuit of the traction network, and allows us to represent it in the form of several homogeneous sections of multiconductor transmission lines with rolling stock units between them. Simulation of induced alternating current interference in the rails of the track with direct current traction is carried out at the second stage, taking into account the design features and electrical parameters of track circuits, as well as specific values of rail-to-ground conductance and earth conductivity, using the values of the currents in the traction network conductors determined in the first stage.
工作中考虑的问题是确保轨道电路与并联牵引网络的电磁兼容性。为了评估交流牵引网络的干扰对轨道电路运行的影响,建立了一个简化模型。该模型基于著名的多导体传输线方法,但由于牵引系统的纵向结构不均匀性,使其难以用于牵引网络的建模。工作中提出的简化假设与轨道相连的轨道电路设备对牵引网络导线中的电流分布影响不大。这些假设使得在建模的第一阶段可以忽略轨道电路的设备,这大大简化了牵引网络的等效电路,并允许我们将其表示为几段均匀的多导体传输线,其中有轨道车辆单元。在第二阶段,考虑轨道电路的设计特点和电气参数,以及轨地电导率和地电导率的具体值,利用第一阶段确定的牵引网络导线内的电流值,对有直流牵引的轨道轨道内的感应交流干扰进行仿真。
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引用次数: 0
Single Event Effects Test Verification for the Virgin Orbit LauncherOne Vehicle 维珍轨道发射一号飞行器单事件效应试验验证
W. Elkman, C. Scoby, Umer Qureshi, Andrew Shirali
This paper describes the SEE (single event effects) design verification approach and proton beam verification test results for the Virgin Orbit LauncherOne (L1) two stage LOX/RP-1 launch system, capable of deploying payloads up to 300kg to 500km Sun Synchronous Orbit (SSO), and deploying payloads up to 500kg to 200km Low Earth Orbit (LEO). [9] Describes the EMI/EMC Control Program tailored from RTCA-DO-160F and MIL-STD-461F. [10] Reports the Electromagnetic Compatibility (EMC) verification procedures and results for LauncherOne,.
本文描述了维珍轨道发射一号(L1)两级LOX/RP-1发射系统的SEE(单事件效应)设计验证方法和质子束验证测试结果,该发射系统能够部署300公斤至500公里太阳同步轨道(SSO)的有效载荷,以及部署500公斤至200公里低地球轨道(LEO)的有效载荷。[9]描述了根据RTCA-DO-160F和MIL-STD-461F定制的EMI/EMC控制程序。[10]报告LauncherOne的电磁兼容性验证过程和结果。
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引用次数: 0
Investigation of PCB generated Magnetic Field as an Acoustic Noise Source onWearable Devices PCB产生的磁场作为可穿戴设备噪声源的研究
Yuchu He, Neil Harris, Hanfeng Wang
Wireless earbud is the most sold wearable type in the consumer electronics market. As wireless earbuds offer more functionalities, the increased complexity and integration may introduce undesirable coupling between different components. One of the undesirable coupling is the magnetic coupling between the earbud main logic board (MLB) and the speaker coil. The low frequency current ripples on the MLB power rail may induce current with acoustic frequency components on the speak coil and lead to unpleasant audible noise. In this paper, the magnetic field generated by an earbud MLB is investigated through simulation with 3D FEM solvers and measurement with a low frequency H-field probe.
无线耳机是消费电子市场上销量最大的可穿戴设备。随着无线耳机提供更多的功能,增加的复杂性和集成度可能会在不同组件之间引入不必要的耦合。其中一种不良耦合是耳机主逻辑板(MLB)和扬声器线圈之间的磁耦合。MLB电源导轨上的低频电流波纹可能会与说话线圈上的声学频率分量产生电流,从而导致令人不快的可听噪声。本文通过三维有限元仿真和低频h场探头的测量,研究了耳机MLB产生的磁场。
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引用次数: 0
Analysis of CM-Signal Suppression Effect from DM Signal by Common-Mode Choke Coil Using Chain-Parameter Matrix 利用链参数矩阵分析共模扼流圈对DM信号的cm信号抑制效果
N. Kuwabara, T. Matsushima, Y. Fukumoto
Common-mode choke coil (CMC) is used in vehicles and electronic devices to improve electromagnetic compatibility (EMC), and the analysis of the CMC effect is essential to improve the design quality of EMC. In this paper, the suppression effect of CMC for the common-mode (CM) signal converted from the differential-mode (DM) signal is analyzed using a chain-parameter matrix. The chain-parameter matrix of the CMC was obtained from the SPICE model and the measured data. And then, the amount of conversion level from DM signal to CM signal was calculated using the chain-parameter matrix of the signal source, the termination, the cable, and the CMC. The CM signal level was calculated for the shielded twisted pair cable with one pair considering imbalances of the signal source, the termination, the cable, and the CMC. The calculation value was compared to the measurement value due to confirm the validity of the method, and the calculated results were in close agreement with the measurement value. The investigation results showed that we should pay attention to the CMC imbalance when the cable is well balanced. In addition, the results suggested that the CMC should be prepared at both ends of the cable to reduce the current outside the shield.
共模扼流圈(CMC)用于提高车辆和电子设备的电磁兼容性,分析其影响对提高电磁兼容性设计质量至关重要。本文利用链式参数矩阵分析了CMC对差模信号转换成共模信号的抑制效果。通过SPICE模型和实测数据得到CMC的链参数矩阵。然后,利用信号源、终端、电缆和CMC的链参数矩阵计算DM信号到CM信号的转换电平量。CM信号电平是考虑信号源、终端、电缆和CMC的不平衡,以一对屏蔽双绞线计算的。将计算值与实测值进行比较,验证了方法的有效性,计算结果与实测值吻合较好。调查结果表明,在电缆平衡良好的情况下,应注意CMC的不平衡。此外,研究结果还表明,在电缆两端均应配制CMC,以减小屏蔽层外的电流。
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引用次数: 1
RF-induced Heating Evaluation for Passive Device in Tissue-Reduced Virtual Family Models at 1.5 T 1.5 T时无源器件在组织简化虚拟族模型中的射频加热评估
Meiqi Xia, Ran Guo, Jianfeng Zheng, Ji Chen
Tissue-reduced virtual family models are developed for the RF-induced heating assessment of passive implantable medical devices. The models are developed based on the Gaussian mixture model. The RF-induced heating of four representative passive device systems is evaluated inside the original human models, tissue-reduced human models, and the ASTM phantom at three landmark positions under a 1.5 T MRI system. From the results of these simulations, it is observed that the RF-induced heating from the tissue-reduced virtual family models is highly correlated to that obtained from the original human body models. It demonstrates the feasibility of using tissue-reduced models for the RF-induced heating testing of implantable medical devices.
针对无源植入式医疗器械的射频加热评估,建立了组织简化虚拟家庭模型。这些模型是在高斯混合模型的基础上建立的。在1.5 T MRI系统下,在原始人体模型、组织缩小人体模型和ASTM假体的三个标志性位置评估四种代表性无源装置系统的rf诱导加热。从这些模拟结果中可以观察到,从组织简化的虚拟家族模型中获得的射频诱导加热与从原始人体模型中获得的射频诱导加热高度相关。它证明了使用组织简化模型进行植入式医疗设备的射频诱导加热测试的可行性。
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引用次数: 0
Improve the Shielding Effectiveness of a BGA Package by Using VSS Ring Structure 利用VSS环结构提高BGA封装的屏蔽效能
Tao Wang
I/O pin counts have been able to increase significantly thanks to ball grid array (BGA) packages. This I/O pin counts increase brings challenges to break out signals and ensure sufficient shielding effectiveness (SE). Shielding can is often used to enhance the SE of the package but in many devices, conformal sputtering shielding is a better option. This paper presents a method to improve the SE by adding a VSS ground ring structure to the sputtering coat. The simulated results show the proposed structure provides 20 dB more SE compare to the structure without a VSS ground ring.
得益于球栅阵列(BGA)封装,I/O引脚数得以显著增加。这种I/O引脚数的增加给爆发信号和确保足够的屏蔽效能(SE)带来了挑战。屏蔽通常可以用来提高封装的SE,但在许多设备中,共形溅射屏蔽是更好的选择。本文提出了一种通过在溅射涂层中加入VSS接地环结构来提高SE的方法。仿真结果表明,与不加VSS接地环的结构相比,该结构的SE提高了20 dB。
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引用次数: 0
On-Site Automotive Environment Measurements for a Risk-based EMC Approach 基于风险的EMC方法的现场汽车环境测量
Vasiliki Gkatsi, R. Vogt-Ardatjew, F. Leferink
Due to the on-going changes in modern technologies, deeper investigation of the complex automotive electromagnetic environments is necessary. Since conventional standardized testing methods are lacking characteristics met in real automotive electromagnetic environments, a risk-based electromagnetic compatibility approach can conclude to detection of potential electromagnetic interference threats. A measurement of a real automotive electromagnetic environment is proposed and investigated using two different measurement methods addressing the temporal and spatial variations of the electromagnetic environment. This investigation reveals the complexity of real electromagnetic environments and the difficulty of them being sufficiently described to warrant electromagnetic compatibility due to continuously varying parameters over space, time, and frequency. The random-walk technique is applied and compared with a discrete static measuring technique of acquiring data. Examination of the collected data is made along with discussion on their possible application through statistical tools.
由于现代技术的不断变化,对复杂的汽车电磁环境进行深入的研究是必要的。由于传统的标准化测试方法缺乏在真实汽车电磁环境中满足的特征,基于风险的电磁兼容性方法可以用于检测潜在的电磁干扰威胁。提出了一种真实汽车电磁环境的测量方法,并采用两种不同的测量方法对电磁环境的时空变化进行了研究。这项研究揭示了真实电磁环境的复杂性,以及由于在空间、时间和频率上不断变化的参数,对它们进行充分描述以保证电磁兼容性的难度。应用随机漫步技术,并与离散静态测量技术进行了比较。对收集到的数据进行检查,并通过统计工具讨论其可能的应用。
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引用次数: 7
期刊
2022 IEEE International Symposium on Electromagnetic Compatibility & Signal/Power Integrity (EMCSI)
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