基于Nios Ⅱ的VGA彩条信号显示的实现

VGA作为一种标准的显示接口得到广泛的应用。依据VGA显示的原理,提出了一种基于NiosⅡ处理器的VGA时序彩条信号显示的实现方法。利用FPGA产生VGA时序信号,NiosⅡ处理器控制输出彩条的颜色,按键控制彩条的输出模式,将要显示信号的数据直接送到显示器,这样就加快了数据处理速度,节约了硬件成本。     

基于FPGA的VGA时序彩条信号实现

视频图形阵列(VGA)作为一种标准的显示接口已得到广泛应用.依据VGA的显示原理,"抛弃"VGA的显示专用芯片,采用现场可编程门阵列(FPGA)产生VGA时序信号和彩条图像信号,并在Altera公司的QuartusⅡ软件环境下完成VGA时序彩条信号模块的仿真.最后下载到FPGA开发板中进行硬件验证,并在CRT显示器上得到正确的条纹图像.利用该原理,可以设计更多的彩色图像,且可以对采集图像进行实时显示.     

基于FPGA的VGA波形显示系统设计与实现

为了适应嵌入式系统显示终端的图形显示应用需要,提出了一种通用的VGA波形显示系统。依据VGA的显示原理,该系统FPGA内部集成A/D控制模块、双口RAM模块和VGA显示控制模块,利用双口RAM完成了采集数据的缓存,通过VGA显示控制模块读取缓存数据,产生标准的VGA控制时序信号,实现数据的图形显示。测试结果表明:基于FPGA的波形显示系统能够产生正确的VGA接口时序,完成波形数据的稳定显示。该系统具有自主知识产权核,方便移植,为基于FPGA的嵌入式可视化终端提供一种较好的解决方案。     

基于FPGA和ADV7123的VGA显示接口的设计和应用

数字图像信息在VGA接口显示器正确、完整地显示，涉及到时序的构建和数字图像信息的模拟化两方面，提出一种能够广泛应用的VGA显示接口方案，详细阐述了数字图像数据DA转化并输出到VGA接口显示器显示的方法，其中包括接口的硬件设计、视频DA转换器的使用方法、通过FPGA构造VGA时序信号的方法等等。最后提供了两种典型应用以及设计方法，一种用于图像采集处理结果的显示，另一种用于辅助前端视频设计。方案可以广泛应用于各种仪器，数字视频系统、高分辨率的彩色图片图像处理、视频信号再现等。     

基于FPGA的VGA显示系统的设计与实现

针对VGA（视频图形阵列）接口显示器的检测需求,设计了一种基于Altera FPGA的VGA显示系统。详细介绍了VGA显示的原理,采用硬件描述语言Verilog完成了VGA显示所需的驱动时序和图像存储相关模块的设计,并对整个系统进行了综合仿真,验证了设计的正确性。仿真与测试结果表明,该设计可以在简单的情况下实现图像或字符显示,节约了硬件成本,还可以满足不同显示标准的需要。     

一种用于视频转换系统的VGA控制器设计与实现

在视频接口应用领域,VGA接口仍普遍存在。本文针对视频接口转换系统中VGA的应用,设计了VGA软件控制器及VGA硬件接口,并在FPGA上实现,能控制LCD显示屏显示清晰的24位真彩色图片。本设计特别适合应用在各种实时监控场景的后端图像显示方面;在要求高分辨率、低成本的图片显示应用场合具有优势;而且VGA控制器还可移植,作为视频接口转换系统的一部分控制VGA接口显示视频。     

嵌入式系统VGA显示驱动实现

本文在分析VGA显示时序的基础上,提出一种使用利用MCU自带的LCD控制器产生出VGA显示时序的方法,使图片的RGB数据按VGA时序输出;同时结合一个权电阻网络来实现VGA接口的RGB信号数模转换,完成VGA接口的显示驱动工作。经测试表明,该方法能可靠地实现VGA接口的显示驱动功能。     

基于FPGA实现VGA的彩色图片显示

VGA作为一种标准显示接口,广泛应用于各种智能控制的显示终端。伴随着电子产业的不断发展,尤其是高速图像处理的发展,对可以将实时图像进行高速处理有了更高的要求。这里根据VGA接口的原理,通过FPGA对VGA进行控制,实现任一彩色图像的显示。通过采用FPGA设计VGA接口可以将要显示的数据直接送到液晶显示器,节省了计算机的处理过程,加快了数据的处理速度,节约了硬件成本。     

基于FPGA的VGA数据通信设计

介绍了利用现场可编程门阵列(FPGA)实现控制VGA数据通信的方法,着重于VGA信号特点的分析和FPGA中重要模块的研究与设计.分析了设计中所用的FIFO模块、VGA控制模块,给出了其顶层模块设计及其时序功能仿真.本设计采用硬件描述语言Verilog编程,利用FPGA产生高精度时序逻辑保证了实时采集及高速传递的正确性,同时能够正确地在显示设备上稳定显示.     

基于ARM嵌入式系统的VGA接口的研究与设计

ARM嵌入式系统中实现VGA显示接口功能,涉及到时序的构建和数字图像信息的模拟化两个主要方面。对基于ARM920T内核的RISC微处理器S3C2410的显示控制模块和高速的数/模(D/A)转换器进行了研究,提出一种能够广泛应用的VGA显示接口方案,详细阐述了数字图像数据D/A转化并输出到VGA接口显示器显示的方法,其中包括接口的硬件设计、VGA时序信号的实现方法、视频D/A转换器的使用方法等,最后介绍了系统VGA接口软件的设计,并给出了寄存器初始化的代码。测试结果表明,该方案实现了在ARM嵌入式系统应用中直接提供VGA显示接口的功能,占用系统资源少,效率高,可靠性好,能够满足实时显示的需要。     

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