IDT推出可编程PLL时钟发生器

IDT公司日前推出可编程时钟发生器新系列。新器件基于EEPROM的可编程序平台，采用IDT可编程时钟以及增强的多相位锁相环路(PLL)架构，符合IEEE1149．1a的JTAG端口编程于边界扫描规范，适用于通信、数字消费和工业市场等领域。     

莱迪斯MachXO器件超越传统的CPLD和FPGA

被莱迪斯称为跨越式可编程逻辑器件的MachXO系列器件是具有FPGA集成性能的非易失CPLD，支持传统上由高密度的CPLD和低容量的FPGA所实现的应用。新器件采用130nm的非易失性嵌入式Flash工艺，以及用于逻辑实现的4输入查找表的方法，能让系统设计者在单位逻辑功能上降低500k，的成本。MachXO器件适用于总线桥接、接口、控制逻辑、时钟管理、电源及复位控制、存储器控制等多种功能的实现，在汽车控制、消费类电子、通信等市场将有广阔的应用前景。     

体声波滤波器和双工器

Maxim推出推挽式FET驱动器．MAX5075／MAX5077，这两款器件内部集成振荡器，具有可编程时钟输出，可用于同步外部PWM控制器。振荡频率通过外部电阻在50kHz～1．5MHz范围内设置。MAX5075有三个版本，其时钟输出与MOSFET驱动器的频率比分别为1倍、2倍、4倍。MAX5077的时钟输出与MOSFET驱动器频率比可通过两个逻辑电平引脚设置为1倍、2倍、4倍。这些驱动器是设计高效、电流反馈隔离电源所必须的基本结构，适用于电信和网络线卡。     

用模块化设计技术改善行为设计的适配结果

本文介绍了模块化设计的方法在可编程逻辑器件进行逻辑设计中的应用，以改善行为逻辑设计适配到可编程逻辑器件结构的效率和资源利用率。文章中的方法以现场可编程门阵列为例，其方法同样适用于复杂何编程逻辑器件。     

GSM射频芯片内RC时间常数测量电路的设计

针对集成电路工艺容差所引起的器件偏差,设计了一款RC时间常数测量电路,适用于GSM系统的多相滤波器模块.电路采用可编程电容阵列,可快速调谐,以保证模块稳定.仿真结果表明,采用5位数控方式调谐电容阵列,调谐时间误差不超过三个时钟周期,满足系统要求.     

IDT推新可编程多相位锁相环路时钟发生器

IDT近日宣布推出可编程时钟发生器新系列。新器件使基于EEPROM的可编程序平台从上一代IDT可编程时钟以及增强的，多相位锁相环路（PLL）架构更容易为客户提供通用性和高性能的完美组合。该产品符合IEEE1149．1a的JTAG端口编程和边界扫描规范，体现了该公司为满足设计师和生产商需求提供定时器件的承诺。新的可编程时钟发生器的性能和特点使之广泛适用于通信、数字消费和工业市场。     

采用ISP技术的通用雷达数字信号光纤传输系统

介绍一种采用ISP技术的通用雷达数字信号光纤传输系统,提出了一种特殊的同步复分接方式,并运用现场可编程大规模集成逻辑器件实现这种同步复分接电路.     

PCM串行数据流同步时钟提取设计

为了产生语音调度系统中数据接收端异步接收PCM30／32路一次群串行数提流所需同步时置瑚目的,采用以分频计数器为基础模块,辅以相位校正和误校正处理模块从已知速率PCM数据流中提取同步时钟信号的方法,利用可编程逻辑器件和VerilogHDL硬件描述语言对该方法进行实现和仿真验证。结果表明该方法能够有效地利用已有串行数据流产生具备合适相位的同步采样时钟信号。     

微机保护中DSP与时钟DS12CR887的接口设计

介绍了以DSP为核心处理器的微机继电保护系统中,利用复杂可编程逻辑器件(CPLD)实现外围电路时序控制的设计方法,通过对时钟器件DS12CR887的分析,给出了电路的硬件结构及其接口电路,并详细介绍了软件的实现方法.     

PLL时钟发生器

IDT公司日前宣布推出可编程时钟发生器系列。新器件符合IEEE 1149.1a的JTAG端口编程和边界扫描规范，适用于通信、数字消费和工业市场。     

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.