液晶显示器的EMC分析与设计

本文对某厂家的液晶显示器的EMC性能进行了分析,并提出了改进方案。关于EMC分析设计的阐述分为两部分:第一部分是关于PCB板上的EMC设计;第二部分分析了液晶显示器中易被人们忽视的各种EMI“天线”,并提出了抑制方法。本文提到的许多EMC设计方法同样适用于其它高频电子产品。     

基于EMC的普通电子元器件选择

在现在的电子设计中EMI是一个主要的问题。许多电子产品都有非常严格的EMC标准,为了达到这些要求,要求设计者必须从板级开始考虑EMI的抑制。对于单板的EMC性能而言,元器件的选择和电路的设计以及PCB Layer是影响它的主要因素,文章主要从普通电子元器件的选择方面来考虑减少或者抑制EMI。     

高频开关电源EMC设计

介绍了我国和欧洲开关电源的电磁兼容标准,针对高频开关电源的工作特点,着重探讨了电磁脉冲设计、电源印制板EMC设计、EMI电源滤波器的设计和屏蔽等电磁干扰抑制方法,通过这些方法的实施,确保高频开关电源满足CISPR22 B级标准的要求.     

数字电路PCB的EMI控制技术

随着IC器件集成度的提高、设备的逐步小型化和器件的速度愈来愈高，电子产品中的EMI问题也更加严重。从系统设备EMC／EMI设计的观点来看，在设备的PCB设计阶段处理好EMC／EMI问题，是使系统设备达到电磁兼容标准最有效、成本最低的手段。本文介绍数字电路PCB设计中的EMI控制技术。     

发射机的电磁兼容性设计

EMI（电磁干扰）问题的深入研究对提高所设计产品的可靠性有着较大的现实意义。文中阐述了EMC（电磁兼容性）在电路设计中的重要性和电子设备的EMC问题。就雷达发射机的EMC设计问题,根据发射机干扰信号的传播途径和耦合方式,针对经常出现的各种EMI问题,提出了接地、屏蔽、滤波、瞬态抑制等4种抑制EMI的方法。介绍了其他一些常用的提高设备EMC的方法,分别从PCB（印制电路板）设计、设备内的布线、软件抗干扰设计等方面进行了探讨。     

高功率因数反激式开关电源的电磁兼容研究

对带有高PF(功率因数)反激式的开关电源的电磁干扰进行了分析.为实现开关电源的EMC(电磁兼容),在设计过程中采用了EMI滤波器.在探讨EMI滤波器的设计原则基础上,分析了高频分布参数对滤波器频率特性的影响,通过设计和调整滤波器的结构及器件参数,实现了EMI传导干扰的有效抑制,使带有高PF反激式的开关电源达到灯具的EMI标准.     

高功率因素反激式开关电源的电磁兼容研究

摘要：论文对带有高PF（功率因素）反激式的开关电源的电磁干扰进行了分析。为实现开关电源的EMC（电磁兼容）,在设计过程中采用了EMI滤波器。论文在探讨EMI滤波器的设计原则基础上,分析了高频分布参数对滤波器频率特性的影响,通过设计和调整滤波器的结构及器件参数,实现了EMI传导干扰的有效抑制,使带有高PF反激式的开关电源达到灯具的EMI标准。     

射频电子设备的辐射电磁干扰诊断与抑制技术研究

射频电子设备产生的电磁干扰(EMI)噪声包括传导干扰噪声和辐射干扰噪声。其中,辐射EMI噪声是以空间电磁场形式影响其它电子设备的。针对射频电子设备产生的辐射EMI噪声,该文分别建立因传输线缆与芯片时钟信号引起的辐射EMI噪声理论模型与等效电路。同时,还针对上述辐射EMI噪声理论模型提出了相应的噪声抑制方法。实验结果表明,采用该文中方法,某型家用液晶显示器的EMI噪声得到了很好的抑制,从而验证了方法的有效性。     

通信开关电源的EMC设计

开关电源模块的电磁兼容性（EMC）问题常常是制约我国通信电子产品出口的一个重要原因。主要介绍了通信电源模块的电磁干扰（EMI）源、抑制电路设计方法及一些应用的实例。     

航天器DC-DC模块电源电磁兼容设计

针对航天器用DC-DC模块电源电磁兼容设计中的发射干扰(RE102和CE102),探寻其产生发射干扰的根源,并分析了DC-DC模块电源输入输出端EMI的产生原因,阐述了工程中常用的抑制EMI的方法:滤波器设计法、印制板EMC设计法.对干扰测试结果超标的DC-DC模块电源采取相应的抑制措施后,测试结果有了显著的改善.     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks