基于DSP＋ARM的便携式电能质量分析仪设计

介绍了基于高性能DSP芯片ADSP21161和S3C2410ARM芯片实现的电能质量分析仪的设计方法。以DSP芯片为核心实现数据采集及处理,以S3C2410芯片为核心实现数据管理、人机界面及系统控制,同时采用WinCE嵌入式操作系统作为系统软件平台。该方案提高了系统的智能化及可靠性,降低了系统功耗并有利于系统扩展。测试结果表明该分析仪的各项指标均满足IEC电能质量测试标准。     

无线网络传感器系统在地质灾害监测中的应用

设计了一个基于无线网络传感器结构的野外数据采集系统,并将其应用于地质灾害监测中;以AT86RF212和SIM300C芯片为核心,搭配相应的处理器芯片和外围功能芯片,组成系统的硬件部分;以簇树路由算法为核心.进行相应硬件模块的驱动程序开发与系统应用程序的编制,组成系统的软件部分;目前该系统已经应用于云南省大关县示范区地质...     

基于64位RISC处理器的片上系统芯片（SOC）设计及应用简介

本文介绍了以64位RISC处理器为核心的片上系统芯片设计方法、芯片功能特点及应用。     

基于USB2．0接口的高速数据传输系统设计

介绍了以高性能的USB2.0芯片CY7C68O13为核心的EZ-USB FX2微处理器,以及以MAX1198为核心的A/D采样芯片构成的高速数据采集和传输系统。论述了系统硬件的结构、软件实现方案以及固件程序流程图。系统具有快速、即插即用、便于系统扩展和升级维护等优点,应用前景良好。对一般的实时、高速数据处理系统研究和设计具有一定的参考价值。     

基于DSP的H.264视频压缩系统的设计与实现

设计和实现了一种以TI的DM642为核心芯片的网络视频压缩系统.介绍了H.264压缩编码技术,DM642芯片的特性,重点阐述了系统的硬件构成及软件设计.系统实现了基于DM642芯片H264压缩编码技术的网络传输,获得了低码率高清晰的图像效果.     

基于KQ—100K的电力线载波通信系统的优化设计

给出了以KQ-100K载波芯片为核心制作低压电力线载波通信系统,以提高系统抗衰减和抗干扰性能的设计方法．同时介绍了载波芯片KQ-100K的工作原理以及载波发送和接收单元的接口电路．最后给出了对基于KQ-100K的载波通信系统进行优化设计的具体方法。     

基于GC5016的WiMAX系统数字中频设计与实现

提出了以TI公司GC5016芯片为核心的WiMAX系统数字中频物理层方案,介绍了GC5016芯片内部结构,并分析芯片内部信号处理过程,根据802.16e相关协议,以数字上变频为例配置GC5016芯片内部参数值,并用Matlab对芯片内部的FIR和CIC数字滤波器幅频特性进行仿真.在实际中频硬件上对数字中频的功能进行测试...     

基于国产核心芯片的单兵继保测试设备设计

继保测试设备在变电站运维中起着至关重要的作用,然而当前多采用以进口芯片为核心的方案设计,存在芯片断供的风险,间接危害电网的安全稳定.为降低设备对进口芯片的依存度,设计一种基于国产核心芯片的单兵继保测试设备.文章分析了单兵运维下的应用场景和性能要求,调研了国产核心芯片和外围电路芯片的现状.以国产芯片全志T3为核心芯片,外...     

基于LPC2368的嵌入式多节点指纹识别系统设计

以集成以太网控制器和CAN总线控制器的ARM7处理器LPC2368为核心,MBF200芯片为指纹传感器模块,PCA82C250为CAN总线收发器芯片,重点阐述了系统接口部分硬件电路图设计和系统软件构建。实现了低成本,高可靠性多节点指纹识别系统的设计。     

基于STEL-2000A的基带扩频系统的设计

针对无线通信系统抗干扰性差、抗多径性能弱的缺点,设计了一个抗干扰性强的的高速基带扩频收发系统.该系统以专用扩频芯片STEL-2000A为核心,以EP3C10E芯片为外围控制芯片,辅以高速A/D、D/A芯片,从而实现了系统功能.首先给出了系统总体原理图,并对硬件设计部分进行详细的讨论,其次,在软件设计部分给出了算法总体设...     

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.     

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