某传感器的电磁兼容设计

阐述了电磁兼容的基本概念及产品电磁兼容设计的必要性，给出了某传感器的一些电磁兼容设计方法。     

LEM传感器在内燃机车蓄电池智能充电器中的应用

介绍了LEM电压电流传感器在内燃机车蓄电池智能充电器中的具体应用方法,并对该传感器的选型、外围电路的设计、参数配置、电磁兼容设计等方面的问题进行了说明.     

电磁仿真技术在电源设计中的应用

基于增强电子设备的电源设计能力,拓展电源设计手段及方法,提高电子设备电磁兼容性能的目的,在电子设备的电源设计及系统供电设计过程中采用电磁仿真技术,搭建虚拟设计验证平台,按照GJB151A-1997的标准要求,通过了国军标电磁兼容试验室测试验证,证明在电源设计中引入电磁仿真技术,采用规范法和系统法,能有效降低电子设备后期电磁兼容性能试验成本,增强整机电源设计能力,提高电子设备电磁兼容性能,并对电源设计存在的弊端进行了分析,同时阐述了电磁仿真技术的功能和作用。     

电磁兼容设计技术的应用与探讨--某信号发生器的设计特例

通过对我公司某种产品试制过程中应用的电磁兼容技术的介绍,探讨了电磁兼容设计的目的和方法,说明了在产品开发中对电磁兼容问题越早引起重视,就越能提高产品的性能特性。     

基于复杂系统的电磁兼容设计方法可行性分析

目前,电磁兼容(EMC)设计已成为复杂系统设计的一个重要组成部分,电磁兼容设计方法主要有测试分析法、经验分析法和建模仿真法三种。从日益复杂的电磁环境的要求出发,结合高度集成的复杂系统电磁兼容设计的实际困难以及电磁兼容设计人员的具体情况,分析测试分析法、经验分析法和建模仿真法这三种电磁兼容设计方法的可行性,指出三种方法的适用范围和面临的问题,从实用角度提出建立电磁兼容数据库,将电磁兼容测试数据、电磁兼容设计经验和电磁兼容模型全部入库的建议,对提高复杂系统的电磁兼容性具有现实意义。     

PCB板时钟电路的电磁兼容设计

为了研究PCB集成电路板中时钟引起的电磁兼容问题,采用了仿真数值计算的方法,对时钟电路的电磁兼容设计时几种主要影响因素进行分析研究,确定了在PCB集成电路板设计时的时钟选择原则,以及时钟电路电磁兼容设计时的具体对象和内容,通过优化时钟设计的布局和布线来达到提高了PCB板电磁兼容设计。最后提出了可以有效切断PCB板上时钟干扰传播途径的几种措施,为工程技术人员提供一种解决相关问题的思路。     

电磁兼容系统中的接地技术应用

阐述电磁兼容和接地技术的特点,探讨接地在电磁兼容实际应用中的关键作用。通过合理的接地设计和布置,可以提高设备电磁兼容性,减少设备之间干扰,增强整体系统稳定性和可靠性。     

机载计算机电磁兼容性设计

介绍了电磁兼容的定义、目的,设计步骤、试验项目和要求,针对机载计算机电磁兼容的特点和工程实践,提出解决机载计算机电磁兼容问题重点关注的四个方面,即电缆设计、机械结构设计、电源滤波器设计和计算机电源接地和信号接地设计。通过总结机载计算机设计和电磁兼容试验中出现的具体问题,从理论上分析问题产生的机理,提出切实可行的工程解决方法。最后强调该技术是试验性的科学,解决方案必须通过电磁兼容试验验证。     

一种电子式速度高度传感器研制

介绍了一种电子式速度高度传感器的原理、设计、制造与实验结果。它利用空气动力学原理，通过测量空气动压及静压来确定速度及高度。经温度补偿、电磁兼容设计，具有精度高、抗干扰、耐低温等特点，可满足型号工程的实际要求。     

基于DSP的USB通信接口的EMC设计

在测量仪器中为了实现稳定高速的USB通信就必须考虑电磁干扰问题.本文针对系统的电磁兼容问题,提出了提高系统电磁兼容性的具体措施,包括滤波技术、接地设计、电磁屏蔽以及PCB设计;介绍了基于DSP的USB通信接口设计方案,其中应用了USB接口芯片.在电磁干扰的工作环境下USB通信平均传输率能稳定达到1 MB/s以上,表明这些提高系统电磁兼容性的措施是有效的.系统通过了电磁兼容和静电抗干扰的认证测试,达到了工程要求.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Nanoimprint Lithography -A Next Generation High Volume Lithography Technique

IntroductionNanoimprint Lithography is a well-acknowl-edged low cost, high resolution, large area pattern-ing process. It includes the most promising methods,high-pressure hot embossing lithography (HEL) [2],UV-cured imprinting (UV-NIL) [3] and micro contactprinting (m-CP, MCP) [4]. Curing of the imprintedstructures is either done by subsequent UV-lightexposure in the case of UV-NIL or by cooling downbelow the glass transition temperature of the ther-moplastic material in case of HEL…     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

Influence of PVK ： NPB hole transporting layer on the characteristics of organic light-emitting devices

A doping system consisting of NPB and PVK is employed as a composite hole transporting layer （CHTL）. By adjusting the component ratio of the doping system, a series of devices with different concentration proportion of PVK ： NPB are constracted. The result shows that doping concentration of NPB enhances the competence of hole transporting ability, and modifies the recombination region of charge as well as affects the surface morphology of doped film. Optimum device with a maximum brightness of 7852 cd/m^2 and a power efficiency of 1.75 lm/W has been obtained by choosing a concentration proportion of PVK ： NPB at 1：3.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.     

Analysis of error performance on Turbo coded FDPIM

Due to variable symbol length of digital pulse interval modulation（DPIM）, it is difficult to analyze the error performances of Turbo coded DPIM. To solve this problem, a fixed-length digital pulse interval modulation（FDPIM） method is provided. The FDPIM modulation structure is introduced. The packet error rates of uncoded FDPIM are analyzed and compared with that of DPIM. Bit error rates of Turbo coded FDPIM are simulated based on three kinds of analytical models under weak turbulence channel. The results show that packet error rate of uncoded FDPIM is inferior to that of uncoded DPIM. However, FDPIM is easy to be implemented and easy to be combined, with Turbo code for soft-decision because of its fixed length. Besides, the introduction of Turbo code in this modulation can decrease the average power about 10 dBm, which means that it can improve the error performance of the system effectively.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

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.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.