基于PCI的双向高速传输系统

为了实现FPGA与PC之间高速数据的双向同时传输,设计了采用PCI接口实现的双向高速传输系统。系统中采用PCI9054作为PCI接口芯片连接PCI总线与FPGA,并通过PCI驱动程序的设计来提高数据传输效率。经过测试,该系统的速度在双向传输上可以同时达到至少80 Mb/s的速率。该系统可以应用在PC与FPGA之间需要大量数据交换的场合。     

10Gbit/s甚短距离并行光传输模块与实验系统

介绍符合OIF-VSR4-03.0规范的10Gbit/s甚短距离(VSR)实验系统研究.该系统由16×622Mbit/s到4×2.488Gbit/s转换集成电路、自制12通道850nm垂直腔面发射激光器(VCSEL)并行光发射模块和商用12通道并行接收光模块构成.用一片FPGA实现转换芯片的全部功能,采用基于二分查找法的SDH STM-64/OC192 并行帧对齐及同步算法,大大提高了转换芯片的工作速度和节省了逻辑资源,自制12通道VCSEL并行发射模块工作速率达到12×2.488Gbit/s的设计指标.在SDH STM-64/OC192 10Gbit/s测试仪点到点的传输系统测试中,采用5米的12芯400MHz·km 62.5μm多模带状光纤互联,系统误码率低于1×10^-14.     

基于级联半导体光放大器实现全光逻辑与门的改进方案

基于级联半导体光放大器(SOA)实现全光逻辑与门的方案中,第一级输出信号质量直接影响逻辑与运算结果.采用载流子恢复较慢的体材料半导体光放大器用于第一级转换,在10 Gbit/s以上得不到理想的转换结果,限制了该方案实现逻辑与门的速率.利用光纤延时干涉仪(DI)和第一级半导体光放大器级联可以改善第一级输出信号质量,从而有效提高第二级全光逻辑与门的实现速率.阐述了改进方案中延时干涉仪的作用,并进行了数值模拟.根据实验结果,采用载流子恢复较慢的半导体光放大器级联延时干涉仪能够实现高速归零(RZ)信号和非归零(NRZ)信号的反码,从而得到较高速率的全光逻辑与门.实验实现了20 Gbit/s的伪随机归零和非归零信号的全光逻辑与门,对40 Gbit/s的结果进行了分析和讨论.     

基于CPLD的声发射信号传输系统设计

介绍了一种通过CPLD对PCI控制器和FIFO进行逻辑控制,并采用WDM程序完成PCI设备的DMA传输系统驱动,从而保证系统可靠性和完整性的声发射信号数据传输系统的实现方法.该数据传输系统可以实现640 Mbps(80 Mbyte/s)以上的实时数据的存储与传输.     

基于SOPC的PCI总线高速数据传输系统设计

本文针对一体化侦察通信接收机高速数据传输的需求,提出了一种基于SOPC实现PCI总线高速传输系统的设计方案。该方案将PCI桥与用户逻辑集成到一片FPGA上,并利用片上CPU实现了DMA控制器的自动配置和总线异常处理,提高了系统数据速率。经硬件平台验证,该设计能够实现大于100M bytes/s的PCI总线传输速率。     

基于PCI总线的雷达视频高速数据采集接口设计

采用Altera公司的FPGA及其PCI接口芯片PCI9054实现了现代雷达视频的高速数据采集接口.在介绍PCI9054接口控制器的基础上给出一种通用的高速数据采集接口设计,并提出一种新的包括PCI9054存储器映射传输操作的设计.经测试证明,该接口的数据采集速率能稳定地达到200 Mb/s.     

光模数转换系统中数据存储与传输

设计了一种光模数转换(OADC)系统中后端高速数据的存储和传输方案.该方案基于主-从现场可编程逻辑门阵列(FPGA)的结构,采用DDR3 SDRAM作为存储介质,基于PCI Express总线通过存储器直接访问(DMA)机制,使数据高度输出,实现了单通道高速数据的实时存储与传输.仿真和测试表明,该方案能够满足单通道输入数据速率为2.56Gb/s的光模数转换系统的要求.     

用于SDH-64光发射机的低功耗CMOS 4∶1复接器

介绍了可用于SDH STM-64光纤传输系统的4∶1复接器.整个电路采用树型结构,低速的复接单元采用动态双相伪NMOS逻辑实现,高速的复接单元采用SCL逻辑实现,提出了一种新型采用正反馈对的单端转双端电路,实现由低速单元到高速单元的逻辑变换.基于此结构的全定制单片集成电路采用0.18 μm CMOS工艺设计并实现.测试结果表明,在供电电压1.8 V,50 Ω负载条件下,复接输出数据速率超过10 Gbit/s,在标准速率10 Gbit/s,输出电压峰-峰值180 mV时,功耗仅为180mW,抖动4.9/s(rms),芯片面积为0.89 mm2×0.7 mm2.     

一种基于数字/旋转变压器转换器的高精度测角系统

该文介绍了一种轴角转换器测角系统的设计与实现,该测角系统基于标准模块,主要构建了相关的硬件电路,最终实现了高精度的轴角信号的模拟和测量.该测角系统具有高精度、双通道、速比可编程等特点,经测试在转速比为1:64时测量精度达到1.875角秒,可广泛应用于高精度轴角转换控制系统的角度模拟与测量.     

物联网智能无线节点自动监控数据采集系统设计

在物联网环境下进行无线节点自动监控数据采集,提高数据检测和诊断分析能力,提出基于动态增益控制和DSP高速信号处理的物联网智能无线节点自动监控数据采集系统设计方法。基于微机总线技术进行无线节点自动监控数据采集系统的总体设计,系统主要包括DSP处理器和PCI总线两大功能模块设计,数据采集的传感器基阵由多传感信息融合的无线监测节点组成,设计收发转换电路和功率放大电路实现采集数据的信号放大和数/模转换。采用动态增益控制方法实现采集数据的放大和滤波处理,基于DSP信号处理器进行自动监控数据采集系统的集成设计。测试结果表明,采用该系统进行物联网智能无线节点自动监控数据采集,能实现持续的大于15 MB/s的实时数据采集和记录,总线持续数据传输速率超过20 MB/s,峰值传输速率也可超过33 MB/s,满足实时记录无线节点自动监控数据的需求。     

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