TMR计算系统中的容错锁相同步时钟电路

以数字锁相技术为基础，研制出用于ＴＭＲ计算系统的容错同步时钟电路。该电路工作稳定、具有完善的容错功能并达到相当高程度的时钟同步水平，在１０￣３０ＭＨｚ频率范围工作时，４个冗余时钟模块之间的最大相位差都小于５ｎｓ，叙述了容错同步时钟电路的工作原理和设计原则，并对引起冗余模块间相位差的各种因素进行了分析。     

L波段相对论速调管束流实验研究

介绍在Ｌ波段强流相对论速调管研究中，强流相对论短脉冲空心电子束的产生，传输、束流调制及其诊断等方面的初步实验研究情况，在直线感应加速器上，利用φ６６ｍｍ，壁厚３ｍｍ的石墨空心阴极，加上约５ｋＧｓ的准直线引导磁、引出了约５００ｋＶ、４．５ｋＡ、脉宽１００ｍｓ、φ５４．５ｍｍ、厚度４．５ｍｍ的空心电子束，注入５００ｋＷ的微波调制，束流经过输入腔后，得到了约６％的最大基波电流调制深度，经过中间腔后，得到     

C波段单片有源环行器

报道了一种源耦合反馈单片有源环行器的研究结果、该单片电路采用实测ＦＥＴ的Ｓ参数进行微波ＣＡＤ优化设计，内部包含有３个３００μｍ栅宽的ＦＥＴ，芯片面积１．７ｍｍ×１．９ｍｍ。采用ＧａＡｓ的离子注入平面工艺，芯片电路具有良好的均匀性、一致性。在３．５～４．５ＧＨｚ内，电路插入损耗约７．５ｄＢ，隔离度为２１～２６ｄＢ，驻波比基本小于２。     

统一格式数字电路倍增设备

根据语音的波形编码与参数编码的特性，提出了一种统一格式的数字电路倍增设备方案（Digital Circuit Multiple Equipment，DCME）。针对电路和分组传输方式，设计了不同的承载结构，从而可以高效的承载各种业务，能适用于各种语音压缩编码和传真解调再调制的情况。承载帧长度采用2．5ms，明显提高了系统的承载快速性能。它可以取代ITU—T G．763、G．767和G．768，并能适应未来的更低比特率或更高质量语音编码。     

红外无线传输在以太网(Ethernet)中的应用

在本文中设计了一种应用于以太网的点对点红外无线传输方案，将室内以太网的传输媒质从有线的铜缆双绞线转换为红外光线，来实现有效的无线数据传输．通过编解码芯片，将以太网的曼彻斯特编码转换成适于红外传输的脉冲位置调制(4PPM)编码，同时将以太网帧格式在物理层上进行处理，能够实现计算机间的兼容于以太网的红外无线(Ethernet-over-IrDA)空间数据传输．     

42.24 Mbits/s多业务大气传输光通信系统的研制

在实际应用中为满足对多业务大气传输光通信的要求，研究并实现了通信速率达42．24Mbits／s的大气传输光通信系统，该系统能够实现V．35、E1、RS-232／485、以太网以及电话语音数据通信等。从光学收发天线、半导体激光器调制驱动电路、光电二极管(PIN)直接检测电路、通信端机等方面阐述了该系统的基本原理、组成结构以及设计思路等。大气传输通信实验表明，传输距离为500m时，在晴朗的天气条件下该系统能实现宽带、高速、低误码率的信息传输。     

高效容错可逆的汉明码编码和检测电路

为了检验传输过程中数据的可靠性,设计了容错可逆的汉明码电路。提出了一种新型的可逆逻辑门（FVG）,它是一种四变量奇偶保持门能容错,并且完成了FVG门等价的量子实现。利用FVG 门和现有的容错可逆门,实现了汉明码编码电路和检测电路。以(7,4)汉明码设计为实例,根据量子代价和延迟对其进行性能评估,结果证明该电路比现有电路的性能提高10% ? 20%,仿真实验结果显示,电路逻辑结构正确,性能可靠。     

基于DSP的音频信号压缩通信系统的设计与实现

针对数据采集系统中语音传输受传输距离、成本等方面限制的问题,设计了一种低成本的语音信号压缩实时通信系统。采用模块化的方法进行硬件设计,通过将精简的TCP/IP协议移植到以太网控制芯片中来实现局域网通信,在DSP上优化实现了G.723.1语音编码算法,编码后的语音数据通过socket传送到PC端,PC端接收解码并实时播放。实验结果表明在语音质量略有退化的情况下,算法复杂度降低了,系统实现了语音信号远距离的实时传输。     

超导SFQ电路间脉冲传输的研究

在超导单磁通量子(Single Flux Quantum,SFQ)数字电路版图设计中,电路单元之间的SFQ脉冲传输设计是十分关键的部分之一.讨论传输线作为SFQ数字电路单元之间互联结构的基础上,提出了适用于SFQ数字电路单元之间互联传输线的匹配电路计算公式.仿真结果表明:根据这一公式得到的参数所设计的电路可以使SFQ脉冲在电路之间实现可靠传输.     

基于ARM控制的电台语音编码单元设计与实现

在研究嵌入式系统和语音编码技术的基础上,介绍了利用ARM芯片LPC2131实现对语音编码芯片MC3418,AMBE2000的控制,构建了语音编译码电路,给出了电台语音编码单元的接口电路和通信软件模块设计。     

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.     

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     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first