基于电动车的MCU与数字电路实验平台设计与实现

设计了一种基于数字电路与MCU的实验平台,将电动助力车、MCU、数字电路三者相结合.并介绍了实验平台的现实意义及目的.阐述了对实验平台的总体设计思想及各部分参数的设定、计算,以及软件硬件部分的设计、实现.     

基于EDA的数字电路综合实验设计与研究

针对当前数字电路实验教学中存在的问题,提出了通过构建基于EDA的数字电路综合实验新模式,来提高学生对数字电路知识的综合应用能力这一思路。在Quartus Ⅱ开发平台上设计了一个涉及知识点全面、集数字电路中多种常用器件和设计方法为一体的综合性实验"出租车计费器",给出了详细的系统设计方案、模块电路及仿真结果。实际教学效果表明,这种综合实验教学的新模式,对学生熟悉和掌握先进的电路设计方法,提高他们的学习兴趣起到了良好的促进作用。     

基于FPGA的“数字电路”教学改革探索

传统“数字电路”课程以讲授中小规模电路为主,与产业和技术应用趋势严重脱节。本文以FPGA设计技术和硬件描述语言为基础,按照数字电路到复杂数字系统的顺序,从易到难地重新设计了教学内容,重点培养学生利用FPGA设计数字电路和数字系统的能力。在理论教学改革的同时,配套的实验课程也采用FPGA平台开展教学。课堂实践证明,改革后的新课程“数字电路与FPGA设计”能够满足应用型本科院校的人才培养需要。     

数字电路实验教学平台的设计与实现

现阶段开展数字电路实验教学的方法是基于面包板的电路搭建及复杂可编程逻辑器件上的功能来实现的,教学内容较为基础且多为验证性实验,缺少综合性、设计性实验。基于此,文章设计了一款数字电路实验新平台,将CPLD部分的实验改为用逻辑功能更强大的现场可编程逻辑门阵列实现。该实验平台在搭建电路的同时能够使用FPGA进行编程,免去了面包板与FPGA之间的切换,并在原有实验的基础上增加了数模转换、模数转换程控放大器的实验等综合性实验。FPGA部分预留了接口,能够让学生完成更多的设计性实验,丰富了实验内容,同时体现了平台的灵活性。     

应用FPGA技术改造数字电路实验

数字电路和数字电路实验课程是高校电类专业的一门重要的技术基础课程和实验环节,笔者在共同编写FPGA技术应用书籍的同时,对照国际电子设计及应用技术的发展趋势,调研国内数字电路教学和实验现状,一致认为,采用FPGA技术,改造高校数字电路实验方法和手段,对促进教学内容的知识更新,顺应国际电子设计及应用技术发展需求,引入计算机EDA技术的设计和仿真手段,加强学生的综合设计能力和直观分析效率,使学生的学习和实验训练与现代技术发展相一致,具有一重要的意义和迫切性。     

基于FPGA的"数字电路"教学改革探索

传统"数字电路"课程以讲授中小规模电路为主,与产业和技术应用趋势严重脱节.本文以FPGA设计技术和硬件描述语言为基础,按照数字电路到复杂数字系统的顺序,从易到难地重新设计了教学内容,重点培养学生利用FPGA设计数字电路和数字系统的能力.在理论教学改革的同时,配套的实验课程也采用FPGA平台开展教学.课堂实践证明,改革后的新课程"数字电路与FPGA设计"能够满足应用型本科院校的人才培养需要.     

利用EDA技术进行数字电路设计性实验的研究

通过实例分析,介绍了EDA技术中Multisim8.0软件平台在数字电路设计性实验中的具体应用及特点,阐明了EDA技术实验环境(仿真实验)与实际操作实验环境(实物实验)的优缺点,并提出数字电路设计性实验在教学中仿-实结合是现代数字电路设计性实验的最佳教学模式.     

EDA在《数字电路》教学中的应用

Max PlusⅡ软件是美国Altra公司提供的现代数字电路设计的有利平台。通过举例详细地说明了在数字电路教学中应用该软件,进行理论与仿真验证相结合,使理论快速地变为抽象感性,从而克服传统教学中的不足。同时改变传统数字电路“芯片 连线”的做法,弥补了硬件实验的不足,开阔了学生的视野,有效地提高了教学质量。     

基于.NET平台的数字电路辅助教学系统设计

现代化的网络教育中,学生和教师的交互性不足,导致线上教育的效率较低,需要辅助教学系统进行辅助教学。因此,提出基于.NET平台的数字电路辅助教学系统设计。首先进行基于.NET平台的数字电路辅助教学系统硬件设计,在教学系统的硬件设计中最重要的就是数据存储器的设计。然后进行基于.NET平台的数字电路辅助教学系统软件设计,设计基于.NET平台的数字电路辅助教学系统数据库,进行系统管理模块设计,设计权限分配模块,设计系统教学模块,最后进行交互模块的设计。通过用例测试的方式进行该系统的功能测试,最终得出系统运行验收测试通过的测试结果。     

VHDL语言在数字电路实验中的应用

传统数字电路实验通常采用TTL或CMOS芯片,不能满足现代数字系统设计的要求。而应用VHDL的数字电路实验降低了数字系统的设计难度,因而应用更加广泛。通过介绍VHDL语言及VHDL语言的程序结构和设计流程,以数字钟为例描述VHDL语言设计数字电路模块化、自顶向下的设计方法,从而说明VHDL语言在数字电路实验中的优点,对实验教学有一定的指导作用。     

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.