数字／模拟混合硬件描述语言VHDL—AMS

自１９８７年ＶＨＤＬ成为ＩＥＥＥ标准以来，ＶＨＤＬ已被工业界广泛认可，并取得了巨大的成功。对于模拟及数字／模拟混合系统，尚没有一种ＩＥＥＥ标准的硬件描述语言问世。介绍了一种正在标准化进程中的数字／模拟混合硬件描述语言ＶＨＤＬ－ＡＭＳ，该语言以ＶＨＤＬ’９３为基础，在其中加入了可描述模拟系统的对象，类型和结构。     

行为级硬件描述语言XHDL的模拟机制

本文介绍了一种集成电路行为级硬件描述语言ＸＨＤＬ，以及利用ＸＨＤＬ如何进行电路的高层次描述，在此基础上着重讨论了ＸＨＤＬ的模拟机制。     

一种用FPGA实现的FIR滤波器的结构

讨论了一种在ＦＰＧＡ中可实现的ＦＩＲ滤波器结构。该结构采用基于流水线型的乘加器和进位保留的加法阵列。为减少硬件消耗,乘法器使用的部分积由修改的Ｂｏｏｔｈ算法产生。ＦＩＲ滤波器用ＶＨＤＬ进行描述,并到ＦＰＧＡ中,从综合结果来看,提出的ＦＩＲ结构可以在ＣＸ４０２５ｅ－２中以５０ＭＨｚ的时钟频率高速运行。     

用于卫星广播接收的D—VHS数字录像机

在数字卫星直播电视蓬勃发展的今天，用以记录数字电视节目的家用数字录像机仍然是市场上的缺门；直到１９９７年，日本日立和ＪＶＣ两公司推出了两种与现有模拟制ＶＨＳ兼容Ｄ－ＶＨＳ数字录像机，才解了燃眉之急。本文根据国外期刊的最新报道，扼要地叙述了Ｄ－ＶＨＳ数字录像机的基本情况及主要性能，Ｄ－ＶＨＳ数码流记忆格式，技术规范和使用磁带的主要情况，并以较多的篇幅介绍了日立ＶＴＤＸ８１５Ａ型Ｄ－ＶＨＳ数字录像机和     

硬件描述语言VHDL及其应用

ＶＨＤＬ是一种超高速ＶＬＳＩ硬件描述语言，能对集成电路的功能和结构进行描述，用ＣＡＤ软件将其编译和转换，并自动形成线路，概要地介绍了ＶＨＤＬ的设计组织和数据类型，并对ＶＨＤＬ的特点及其在ＶＬＳＩ设计中的应用要点做了一些探讨。     

带VCXO的HDSL模拟前端

带ＶＣＸＯ的模拟前端采用提供把一个ＨＤＳＬ（ＨｉｇｈｂｉｔｒａｔｅＤｉｇｉｔａｌＳｕｂｓｃｒｉｂｅｒＬｉｎｅ，高位速率数字用户线路）数字信号处理器连接到一个外部折衷混合电路和一个ＨＤＳＬ线路变压器上所需的所有的有源模拟电路的方法，大大减小了ＨＤＳＬ系...     

手机前线

ＭＯＢＬＥ‘Ｓ　ＦＲＯＮＴＬＩＮＥ三星　ＳＣＨ－Ｘ２９０ ＳＣＨ－Ｘ２９０ 是韩国三星出品的一款ＶＯＤ视频点播手机，显示屏为４０９６色的ＳＴＮ－ＬＣＤ，支持４０和弦铃声，机身顶部的来电显示灯可报据不同的来电者设定５种颜色变化。这款手机规格为：８８．５ × ４６．５ × ２０．６／２２．８毫米（薄电／厚电），重量为８９／１０５．２克（薄电／厚电）。三星　ＳＰＨ－Ｘ４５００ ＳＰＨ－Ｘ４５００是一款外型独特的贝壳机，翻盖上镶有一块椭圆形装饰物，有点类似于女性的化装盒，估计女性消费者会喜欢这款手机。这款手机…     

用isp—VHDL设计数字系统

运用超大规模可编程器件与电子设计自动化（ＥＤＡ）技术是现代电子技术的发展潮流。用硬件描述语言ＶＨＤＬ设计数字系统、设计综合、仿真均是ＥＤＡ技术的重要内容。文章阐述了用美国Ｌａｔｉｃｅ公司的ｉｓｐＶＨＤＬ软件设计数字系统的方法。     

实用显示技术

本文主要介绍了ＬＥＤ显示器中ＨＤＳＰ－２５３２的应用，以ＳＥＤ１５２０为显示驱动控制器的点阵图形式ＬＣＤ显示器的应用，ＬＣＤ显示器的新产品－采用内热式加热技术的ＬＣＤ显示器以及和ＬＣＤ兼容的ＶＦＤ显示器。     

使用VHDL语言开发通信接口芯片

讨论了ＶＨＤＬ语言在ＥＤＡ中的诸多优点，给出了使用ＶＨＤＬ开发通信接口ＥＰＬＤ的一个实例，并就此总结在使用ＶＨＤＬ过程中的一些经验。     

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.     

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.     

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.     

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.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

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.