基于System Generator的FIR滤波器的设计与实现

System Generator for DSP是Xilinx公司开发的基于Matlab的DSP开发工具,同时也是一个基于FPGA的信号处理建模和设计工具.本文介绍了在Matlab中使用SystemGenerator for DSP实现FPGA硬件设计的方法,同时利用System Generator实现了FIR滤波器的设计,从而给出了FIR滤波器设计的一种新途径.设计结果表明:该方法具有操作简单,设计灵活,效率高等优点.     

基于System Generator的数字下变频设计

Xilinx公司推出的DSP设计开发工具System Generator是在Matlab环境中进行建模,是DSP高层系统设计与Xilinx FPGA之间实现的"桥梁"。在分析了FPGA传统级设计方法的基础上,提出了基于System Generator的系统级设计新方法,并应用新方法设计验证了一套数字下变频系统,通过仿真和实验结果验证了该方法的有效性和准确性。     

FPGA设计园地④MATLAB算法优化FPGA设计

System Generator for DSP作为一款使用图形方法创建DSP设计的高产工具,其拥有一个可视化编程环境,可利用The MathWorks Simulink工具及其预定义的DSP功能块,从而能同时满足系统集成设计组件和硬件设计人员的需求.MATLAB算法则更以其丰富的算法开发与调试环境优化了FPGA设计.     

MATLAB算法优化FPGA设计

System Generator for DSP作为一款使用图形方法创建DSP设计的高产工具,其拥有一个可视化编程环境,可利用The MathWorks Simulink工具及其预定义的DSP功能块,从而能同时满足系统集成设计组件和硬件设计人员的需求.MATLAB算法则更以其丰富的算法开发与调试环境优化了FPGA设计.     

HDL设计和验证与System Generator相结合

Xilinx System Generator for DSP是用来协助系统设计的MATLAB Simulink模块集。System Generator for DSP在熟悉的MATLAB环境中引入Xilinx FPGA对象,让您能够对设计进行功能仿真,并且使用MATLAB环境对照理想参考结果验证位精度和时序精度模型。这些参考结果可以在MATLAB环境外部生成,也可以在其内部生成,在这两种情况下您均可从MATLAB环境中引用Xilinx FPGA硬件平台。     

基于DDLMS算法的信道均衡器的FPGA实现

无线通信系统中均衡技术是改善信道特性解决码间干扰的有效方法.从分析判决引导最小均方误差算法(DDLMS)算法出发,研究了其在信道均衡技术上的应用,并通过Matlab仿真和软件(Xilinx System Generator for DSP)开发软件在FPGA上实现了一个基于DDLMS算法的基带均衡器.从仿真测试结果可以...     

Xilinx新版DSP开发工具 可提升DSP性能高达38％

赛灵思公司宣布其DSP开发工具可将多速率DSP设计的Fmax性能提升高达38％，同时还大大提高了易用性。AccelDSP综合工具和System Generator for DSP工具9-2版的发布，使Xilinx XtremeDSP解决方案的开发工具组件提供了更高的性能水平，同时两种工具间的集成也更为紧密，为同时使用MATLAB和Simulink建模环境的开发人员进一步简化了FPGA设计流程。[第一段]     

Xilinx新版DSP开发工具可提升DSP性能高达38％

全球可编程逻辑解决方案厂商赛灵恩公司（Xilinx）2007年9月7日宣布其DSP开发工具可将多速率DSP设计的Fmax性能提升高达38％，同时还大大提高了易用性。ACCeIDSP综合工具和System Generator for DSP工具9．2版的发布，使Xilinx Xtreme DSP解决方案的开发工具组件提供了更高的性能水平，     

基于System Generator的插值滤波器的FPGA实现

在数字示波器中,当最高采样率都不能满足系统要求的时候,我们需要对其进行相应倍数的插值。文章介绍了使用XILINX System Generator for DSP工具在MATLAB/Simulink的环境下完成算法的建模,然后生成相应的工程代码,来开发基于FPGA的插值数字滤波器,借助Modelsim工具验证实现结果。大大消除了原先系统工程师和软硬件工程师之间的隔阂,同时也简化了传统的FPGA开发流程。     

基于SG FIR Filter的设计方法与分析

基于Xilinx System Generator for DSP工具,在现场可编程逻辑门阵列（FPGA）硬件平台上为了研究FIR滤波器的设计及实现技巧,给出了一个18阶的FIR数字低通滤波器滤波的实验,从滤波器的滤波效果和资源利用率等方面进行了分析,获得了针对不同型号的FPGA芯片和在不同硬件资源环境下,如何选择最优的设计实践方法的结果,得出了使用已封装好的Ipcore来实现所设计的滤波器,不但简单方便,可以减少系统的开发时间,又能有效的利用硬件资源,为最佳选择的结论。     

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.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

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.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.