高速PCB电磁兼容性设计

讨论了在高速PCB设计中电磁干扰的产生原理,阐述了提供低阻抗的射频电流回路、避免串扰等抑制电磁干扰的措施来满足PCB的电磁兼容性。对高速PCB设计有一定的指导作用。     

On designing incentive-compatible routing and forwarding protocols in wireless ad-hoc networks

In many applications, wireless ad-hoc networks are formed by devices belonging to independent users. Therefore, a challenging problem is how to provide incentives to stimulate cooperation. In this paper, we study ad-hoc games—the routing and packet forwarding games in wireless ad-hoc networks. Unlike previous work which focuses either on routing or on forwarding, this paper investigates both routing and forwarding. We first uncover an impossibility result—there does not exist a protocol such that following the protocol to always forward others' traffic is a dominant action. Then we define a novel solution concept called cooperation-optimal protocols. We present Corsac, a cooperation-optimal protocol which consists of a routing protocol and a forwarding protocol. The routing protocol of Corsac integrates VCG with a novel cryptographic technique to address the challenge in wireless ad-hoc networks that a link’s cost (i.e., its type) is determined by two nodes together. Corsac also applies efficient cryptographic techniques to design a forwarding protocol to enforce the routing decision, such that fulfilling the routing decision is the optimal action of each node in the sense that it brings the maximum utility to the node. We evaluate our protocols using simulations. Our evaluations demonstrate that our protocols provide incentives for nodes to forward packets. Additionally, we discuss the challenging issues in designing incentive-compatible protocols in ad hoc networks. Part of this paper appeared in a conference version [49]. Sheng Zhong was supported in part by NSF grants ANI-0207399 and CNS-0524030. Yang Richard Yang was supported in part by NSF grants ANI-0207399, ANI-0238038, and CNS-0435201. This work was partly done while Sheng Zhong was at Yale University; Yanbin Liu was at University of Texas at Austin. Sheng Zhong is an assistant professor in the State University of New York at Buffalo. He received his PhD (2004) from Yale University and his ME (1999), BS (1996) from Nanjing University, China, all in computer science. His research interests include economic incentives and privacy protection, particularly incentive and privacy problems in mobile computing and data mining. Li Erran Li received his B.E. in Automatic Control from Beijing Polytechnic University in 1993, his M.E. in Pattern Recognition from the Institute of Automation, Chinese Academy of Sciences, in 1996, and his Ph.D. in Computer Science from Cornell University in 2001 where Joseph Y. Halpern was his advisor. He is presently a member of the Networking Research Center in Bell Labs. His research interests are in networking with a focus on wireless networking and mobile computing. He has served as a program committee member for several conferences including ACM MobiCom, ACM MobiHoc, IEEE INFOCOM and IEEE ICNP. He is a guest editor for JSAC special issue on Non-Cooperative Behavior in Networking. He has published over 30 papers. Yanbin Liu received her B.E. degree in Computer Science and Technology from Tsinghua University (1993), Beijing, China, in 1993, and her M.S. degree in Computer Science from the University of Texas at Austin (1998), where is a Ph.D. candidate. Since 2006, he has been with IBM TJ Watson Research Center, Hawthorne, NY. Her research interests are in real-time systems, grid computing, mobile computing, and computer networks. Yang Richard Yang received his B.E. degree in Computer Science and Technology from Tsinghua University, Beijing, China, in 1993, and his M.S. and Ph.D. degrees in Computer Science from the University of Texas at Austin in 1998 and 2001, respectively. Since 2001, he has been with the Department of Computer Science, Yale University, New Haven, CT, where currently he is an Associate Professor. His current research interests are in computer networks, mobile computing, and sensor networks. He leads the Laboratory of Networked Systems (LANS) at Yale University.     

一种跳频抗干扰数据链系统设计

有人或者无人飞行器数据链需具有很强的抗干扰和多套系统兼容工作能力。在分析跳频系统多套系统兼容工作性能的基础上,给出了一种采用跳频技术的抗干扰数据链路设计方案,并对其性能进行了分析和仿真。仿真结果表明,该方案具有抗干扰能力强、传输速率范围宽、一对多以及多套系统的兼容工作等特点,可以满足有人或无人飞行器抗干扰数据传输的需求。     

NFC端到端兼容性测试研究

近场支付由于其产业链过长、相关硬件厂商众多的特点,给其兼容性带来了巨大挑战.在NFC一致性测试的基础上,提出了严格的一致性测试、仪表兼容性测试、R/W兼容性测试、POS兼容性测试等4种提高NFC终端与POS之间兼容性的测试方法,并分析了其优缺点.行业相关方可结合自身资源及需求,采用其中一种或几种方法相结合的测试手段,提高NFC端到端兼容性,优化NFC支付生态环境.     

探讨PCB 设计中的EMC

在军用电子设备的应用中,在同一种装备中会出现多种功能不同的电子分单元机箱,所以在抗住其它分设备的 电磁干扰的同时,也要使本身的设备不能干扰其他设备,所以必须在印制电路板设计中,考虑电磁兼容和电磁干扰问题。 本文以电磁兼容为题,展开了在印制电路板设计上的接地和去耦的作用,阻抗匹配的重要性和如何控制信号传输线的阻 抗,以及印制电路板的地线结构作了分析,从避免印制电路板形成辐射和提高其抗干扰能力的角度阐述了在印制电路板上 如何合理布置地线及地线网格、地线面的应用方法,最后分析了印制电路板的布线原则。     

舰载天线辐射场的计算及分布特性研究

对舰载天线辐射场分布特性进行分析,是研究舰船电磁兼容性及工程建设的关键环节。为此,采用FEKO软件建立了舰船及天线的全尺寸仿真模型;基于多层快速多极子理论,给出了舰载天线辐射场的计算公式;以上述研究为基础,分别仿真计算了天线载体、天线频率及天线倾角对辐射场分布的影响规律。研究成果对提高舰载天线电磁兼容适应性具有一定的参考价值。     

浅析智能网联汽车感知系统电磁兼容性

本文将就智能网联汽车感知系统中的电子兼容技术进行深入的分析和探究。     

通信电源电磁兼容性分析与测试

针对近年来通信和广播电视等行业使用的高频开关电源,不间断电源电磁兼容性能所出现的一些带有普遍性的问题作了研究分析,重点讨论了引起传导骚扰电压和辐射骚扰场强超出限值的几种因素。建议电源生产厂家在产品的研发阶段对电磁兼容性予以足够遥重视,并采取相应的技术措施,使产品定型生产后尽可能不出现电磁兼容性问题,避免重新设计整改所造成的损失。同时,简要介绍了与高频开关电源和不间断电源相关的国内外电磁兼容标准,对     

多通道高速ADC电路PCB设计技术浅谈

ADC是将模拟信号转换为数字信号的芯片,它在电路系统中的作用决定了它必然和其它大量数字电路一起使用,所以在其PCB设计中除了需要考虑一般PCB设计中要注意的问题之外,还要在多方面引起特别注意,尤其是在高速应用中。本文就针对多通道高速ADC电路设计的特点,以E2V公司的EV10AQ190芯片为例,重点讨论了包含多通道高速ADC的硬件电路设计中印刷电路板布局时所必须引起注意的问题,包括数字地和模拟地。数字电源和模拟电源的处理,ADC输入信号的隔离问题,采样时钟的处理和输出信号的阻抗匹配等问题。     

体硅热膜传感器单片集成工艺的研究

针对MEMS热膜式传感器的发展趋势和在实用化过程中存在的问题,提出了一种新型的单片电路和体硅MEMS热膜式传感器实现集成制造的嵌入式CMOS工艺技术,解决了MEMS制造工艺和CMOS集成电路工艺之间存在的兼容性问题。通过这种嵌入式CMOS工艺技术,可以实现具备最小体积、最低成本的MEMS器件。通过这种嵌入式热膜式传感器和CMOS处理电路的单片集成制造工艺,实现了一款热膜式传感器和IC放大电路的集成部件,并完成了相关基本电性能测试和传感器功能的演示验证,证明了设计的工艺路线的可行性。