卫星应急通信指挥平台设计方法论

卫星应急通信指挥平台设计是一项复杂的系统设计工作,需要设计人员掌握和运用多种设计方法。本文概括性地归纳了卫星应急通信指挥平台设计的一般性方法论,分析了卫星应急通信指挥平台设计的基本原则、主要特征、性质分类,总结了设计过程中运用的传统设计方法和现代设计方法,包括模型设计法、常规设计法、系统设计法和可靠性设计法等4种主要设计方法,为设计人员进行卫星应急通信指挥平台设计提供了理论指导。     

集成电路设计方法新进展

文章首先简单回顾了近两年来我国集成电路设计技术的现状,然后详细阐述了基于IP的设计方法、基于平台的设计方法。同时对混合信号集成电路设计方法和DSP的设计新方法进行了探讨。最后讨论了基于IP重构的设计方法和90nm以后集成电路设计方法中的一些热点问题。     

PLC程序设计方法综述

PLC常用的设计方法包括逻辑设计法、转换设计法、时序设计法、经验设计法和顺序设计法等5种设计方法,不同的应用场合可以使用其中的一种或多种设计方法。本文介绍了PLC各设计方法的步骤,通过对比分析总结各设计方法的优缺点及设计技巧。     

圆极化罩的等效电路模型与设计

给出了多层圆极化罩的等效电路模型和一种设计方法,直接对圆极化罩的等效电路模型进行求解,求解出满足形成圆极化的电路导纳值,根据导纳求解值和电磁场软件仿真可以非常容易地确定每层金属栅的结构参数。基于文中给出的设计方法,分析设计了常用的2 层、3 层和4 层圆极化罩,给出了设计结果和仿真结果,仿真结果和设计结果非常吻合,验证了设计方法的正确性。这种基于电路求解的设计方法具有突出优点:原理清晰、设计简单且设计结果非常准确。     

SOC设计SI分析优化方法研究

基于集成电路规模与设计工艺不断发展的现状,SI问题日益突出和严重。系统介绍了SOC设计SI的概念、分类及产生基理,根据电路工程设计经验,重点阐述了在SOC设计SI的设计、优化、分析方法,介绍了利用EDA设计工具在芯片设计过程中对SI进行阻止、优化、分析的流程及方法,并对各种设计优化方法进行了利弊的对比分析,对芯片设计提供了很好的指导,结合EDA工具及合理的设计流程方法能够有效的保证芯片设计的良率和性能。     

基于FPGA的在线可写CAM存储器设计

简述了CAM存储器(Content Addressable Memory)的主要应用,讨论了采用可编程器件FPGA设计CAM的一般方法和优缺点,针对FPGA设计的CAM不易在线写入的问题,提出了利用FPGA中查找表LUT设计存储单元,实现CAM内容在线可写的新方法。详细论述了基于Xilinx公司最新FPGA设计实现在线可写CAM的技术,通过设计实例验证了方法的实用性,分析了资源消耗和访问速度,表明该方法设计的CAM资源利用率较高、访问速度快、设计方法容易、易于扩展,能够满足内容在线可写的应用要求。     

分布式计算机数据库系统设计与探究

文章主要分析了分布式数据库设计的特点、方法与技术,综述了自顶向下和自底向上分布设计方法的理论和技术,主要论述了DATAID-D 自顶向下设计方法,并分析了分布式计算机数据库系统功能的实现。     

航空机载综合控制管理设备的测试性设计研究

分析了开展航空机载设备测试性设计的目的和意义,对设备的测试性设计流程、设计方法、试验验证和指标评估等方法进行了探讨。首先,具体描述了机载设备的BIT设计方法;其次,对典型功能电路采用的BIT方法和复杂电子器件采用的边界扫描测试性设计进行了介绍,肯定了测试性试验对装备测试性指标评估的作用;然后,对测试性设计中常见问题提出了解决措施;最后,指出装备应持续改进测试性设计以达成用户要求。     

健壮设计在专用设备研发中的应用

简要介绍了健壮设计的指导思想、基本原则和基本方法;健壮设计的方法能对产品研发和全面质量竞争起到积极的作用。专用设备的研发一般是针对性很强的正向设计,使用QFD、系统设计、试验设计和方差分析等技术方法在产品研发中能够起到较好的效果。通过具体案例较为详细的阐述了健壮设计技术方法的使用;充分说明了健壮设计在专用设备研发中的重要意义和积极作用。     

基于Proteus的双二次型低通滤波器设计与仿真

针对双二次型低通滤波器设计过程的要点和注意事项,完整地介绍了双二次型低通滤波器的设计方案,通过归一化算法,结合EDA软件仿真,给出了双二次型低通滤波器的通用设计方法和优化方法。结合实际应用案例详细阐述了在Proteus中如何对所设计的滤波器进行仿真和测试。测试结果表明,使用该方法设计的低通滤波器性能稳定、设计难度小,成本低的优点,为低通滤波器的设计提供了一个新思路。     

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.     

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.     

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.     

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.     

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.     

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.     

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