不符合20H规则的阻抗线参考层设计对阻抗测量的影响

20 H规则作为PCB典型布线规则,随着传输信号工作频率逐步提高,其越来越被PCB设计人员采用以用来减少EMI问题。当然,PCB制造人员无法模拟20 H规则的EMI但须控制特性阻抗,故本文试图首次阐述20 H规则对特性阻抗控制的影响,并通过相关试验与量产过程进行证明。     

H.323消息编解码的研究与实现

本文研究了H.323协议集消息的编解码,ASN.1的PER规则,并提出了一种H.323消息编解码的实现方法。     

雷达对抗兵棋棋子与规则设计

兵棋棋子和规则构筑了兵棋推演的基本体系,对兵棋棋子和规则进行设计是建立兵棋系统的重要基础工作.雷达对抗兵棋既要具备常规兵棋的一般特点,也要具备自身领域特色.从雷达对抗兵棋棋子和规则设计的原则入手,对兵棋棋子以及涵盖兵棋推演规则、兵棋裁决规则、标示规则、行动规则层面的兵棋规则进行了设计研究.     

一种基于DSP的H.264到H.263实时转码器

设计了一种基于DSP的H.264到H.263实时转码器,充分利用视频编解码过程的冗余信息,对传统结构的转码器进行改进,降低了转码运算复杂度.结合TMS320DM642的特点在DSP平台上完成了这两种转码器的优化实现.最终实验数据表明,传统结构转码器优化后转码速度能达到20f/s(帧/秒),而所设计的转码器则能实现CIF格式25f/s从H.264到H.263的实时转码,并且没有显著的视频质量损失.     

GEDS中的联机增量式设计规则检查及其实现

版图的联机增量式设计规则检查(IDRC)是指在版图设计过程中随设计的进行渐进完成版图设计规则检查.我们在版图交互编辑系统GEDS中嵌入并实现了一个IDRC过程.文中介绍了基本的设计规则检查算法和IDRC的实现策略.结合版图的分级设计还讨论了分级设计规则检查方法.     

FELLOW CMOS双层金属工艺的门阵列版图设计系统

本文详述了CMOS双层金属工艺的门阵列版图设计系统 FELLOW及其系统结构与主要算法.该系统覆盖了门阵列设计中从逻辑网表描述(Netlist)到物理版图(Layout)生成的所有设计阶段.在系统的结构设计上,采用了统一的数据管理和用户界面管理,而使系统模块化、集成化.整个系统与库单元都独立于工艺设计规则,即系统与已建立的单元库可以适用于不同的设计规则.三个芯片设计的实例比较,结果显示其芯片面积比单层布线工艺要减小20％以上.     

基于MB86H20B平台的机顶盒软件结构设计与实现

基于FUJITSU公司的MB86H20B平台,设计并实现了机顶盒软件结构.具体包括硬件层、内核层、中间件层和应用层4个层次模型,以及具体的线程设计等关键内容.     

非规则曲面共形阵列的优化设计

该文对一个共形在非规则曲面上的H形微带阵列进行了优化及设计。采用自适应混合遗传算法对此共形阵列的辐射方向图进行了优化设计。优化后的辐射方向图在水平方向几乎达到了全向辐射,俯仰面方向图集中辐射在水平方向。最后考虑到相位误差,对优化结果进行了误差分析。结果表明,该文所提出的优化算法对于非规则曲面上共形阵列的设计是有效和可行的。     

H.264在手机电视中的应用

研究和分析了手机电视所采用的H.264解码器的计算复杂度及其在解码过程中所需的运算量,并设计出一种H.264低功耗运动补偿IP块.仿真结果表明,在手机电视中,使用0.18μm EML工艺生成的低功耗运动补偿IP块,采用数据并行可将其频率降到20MHz.而嵌入的DRAM帧缓冲器又减少了外部数据的输入输出,功耗可因此降低31%.本文所设计的H.264低功耗运动补偿IP块提高了压缩效率,加快了帧速率.     

串行FRAMFM25H20原理及其应用

介绍非易失性铁电存储器FM25H20的性能特点,内部结构和工作原理;给出单片机与FM25H20的写操作接口电路图.以及FM25H20的写操作流程图.归纳出任何一款8位数据总线宽度用于计算机系统时使用FM25H20的方法.从而实现大客量存储系统的扩展.     

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.     

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.     

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.     

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.     

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.