任意信号产生器USB2.0接口设计

介绍USB 2.0控制器CY7C68013的功能、特点和应用。在采用USB 2.0接口的任意波形产生器设计中,通过GPIF模式和端口模式的灵活结合,解决了GPIF模式不能给SRAM提供足够寻址空间的问题。重点介绍了USB开发中的固件编写和驱动编程。     

基于GPIF的USB-EPP解决方案

基于EZ-USB FX2系列USB(通用串行总线)单片机中的GPIF(通用可编程接口)功能和USB2.0接口功能,模拟EPP(扩展并行端口)的全部读写时序,使得PC能够通过USB接口与EPP接口设备进行通信.方案中通过PC上的驱动程序和转换板上固件程序实现了USB接口的控制、中断、批量3种传输方式,通过使用Cypress公司提供的GPIF Designer工具开发GPIF,预先定义好波形描述符,在程序执行过程中通过激发GPIF功能来模拟EPP的数据读写、地址读写时序,完成USB协议与EPP协议的双向转换.此方案硬件实现简单,具有可靠性高、传输速度快、占用CPU及内存资源少等特点,是扩展PC上EPP接口的良好选择.     

EZ-USBFX2接口在生物电信号数据采集系统中的应用

摘要：介绍EZ．USBFX2的结构和功能;给出基于EZ—USB FX2,FPGA控制A／D转换实现的生物电信号数据采集系统;重点说明了基于GPIF主控制方式的EZ—USB FX2接口设计及相应固件程序开发,并给出GPIF波形设计方案。     

EZ-USB FX2接口在生物电信号数据采集系统中的应用

介绍EZ-USB FX2的结构和功能;给出基于EZ-USB FX2,FPGA控制A/D转换实现的生物电信号数据采集系统;重点说明了基于GPIF主控制方式的EZ-USB FX2接口设计及相应固件程序开发,并给出GPIF波形设计方案.     

FPGA的USB2.0通信接口的开发

为了实现FPGA与USB之间的数据传输,介绍了USB2.0通信接口的硬件设计,USB固件程序的编写以及利用MFC编写上位机程序。通过把FPGA存储的数据用USB接口传输给上位机并保存,采用了USB的同步Slave FIFO的接口模式和Bulk的传输模式来传输数据。实验结果表明基于FPGA开发的USB2.0接口工作正常,满足USB2.0接口规范和设计要求。     

基于USB2.0的数据采集卡接口设计

介绍了基于通用串行总线USB2.0的数据采集卡接口设计,重点介绍了现场可编程门阵列程序设计和通用可编程接口波形描述符以及固件、应用程序的设计。通过对模块的验证,本设计可以正确地实现计算机和外电路之间的数据传输。     

一种基于USB接口的实时信号采集系统设计

以CYPRESS公司的USB芯片CY7C68013为例,详细介绍了一种通过USB接口,将A/D 采样数据实时地传送到计算机的电路设计。USB系统设计包括硬件设计、固件程序设计、设备驱动程序设计和设备应用程序设计。重点介绍硬件设计和固件程序设计,设备驱动程序使用CYPRESS公司提供的设备驱动程序实例。在测试系统性能时,编写了一个设备应用程序,以验证系统性能。     

USB2.0通用串行总线软件系统的设计

介绍了基于USB2.0规范的通用串行总线的硬件系统和软件系统,并结合USB2.0接口在实时高带宽数据采集系统中的应用,探讨了系统的固件程序、Windows 2000系统下的设备驱动程序和应用程序的开发.该USB接口方案给设备端提供了一个通用的接口,无须更改硬件电路,只需升级固件程序,就可以应用在各种实时高带宽系统(例如雷达系统、音频和视频采集系统等)中,也可应用于其他USB设备上,具有广泛的通用性.     

基于GPIF模式的电子舌数据采集系统设计

电子舌在人工味觉识别领域有着广泛的应用,但电子舌采集数据量庞大,在新型伏安电子舌系统设计中,提出了一种基于GPIF模式的高速数据采集传输方案。该方案采用CYPRESS的CY7C68013A作为USB收发控制芯片,并利用此系列芯片特有的GPIF接口模式与高速AD芯片AD7492-5相连,通过波形编辑器设计GPIF波形,使用C语言编写通信程序,实现了电子舌与计算机之间数据的高速传输。经实验证明,该系统能使大量数据得到更加快速、实时的存储与处理。     

USB2.0接口动态图像采集系统

USB2.0是新一代的通用串行总线标准,其传输速度高达480Mbps,是用于高分辨率动态图像采集系统的理想接口.本文介绍了USB2.0控制器EZ-USB-FX2的性能特点,以及作者将它用于130万像素动态图像数据采集系统的开发研究工作,包括讨论系统硬件、设备固件、驱动程序及微机应用程序的实现方法.     

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.     

Nanoimprint Lithography -A Next Generation High Volume Lithography Technique

IntroductionNanoimprint Lithography is a well-acknowl-edged low cost, high resolution, large area pattern-ing process. It includes the most promising methods,high-pressure hot embossing lithography (HEL) [2],UV-cured imprinting (UV-NIL) [3] and micro contactprinting (m-CP, MCP) [4]. Curing of the imprintedstructures is either done by subsequent UV-lightexposure in the case of UV-NIL or by cooling downbelow the glass transition temperature of the ther-moplastic material in case of HEL…     

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.     

Influence of PVK ： NPB hole transporting layer on the characteristics of organic light-emitting devices

A doping system consisting of NPB and PVK is employed as a composite hole transporting layer （CHTL）. By adjusting the component ratio of the doping system, a series of devices with different concentration proportion of PVK ： NPB are constracted. The result shows that doping concentration of NPB enhances the competence of hole transporting ability, and modifies the recombination region of charge as well as affects the surface morphology of doped film. Optimum device with a maximum brightness of 7852 cd/m^2 and a power efficiency of 1.75 lm/W has been obtained by choosing a concentration proportion of PVK ： NPB at 1：3.     

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.     

Analysis of error performance on Turbo coded FDPIM

Due to variable symbol length of digital pulse interval modulation（DPIM）, it is difficult to analyze the error performances of Turbo coded DPIM. To solve this problem, a fixed-length digital pulse interval modulation（FDPIM） method is provided. The FDPIM modulation structure is introduced. The packet error rates of uncoded FDPIM are analyzed and compared with that of DPIM. Bit error rates of Turbo coded FDPIM are simulated based on three kinds of analytical models under weak turbulence channel. The results show that packet error rate of uncoded FDPIM is inferior to that of uncoded DPIM. However, FDPIM is easy to be implemented and easy to be combined, with Turbo code for soft-decision because of its fixed length. Besides, the introduction of Turbo code in this modulation can decrease the average power about 10 dBm, which means that it can improve the error performance of the system effectively.     

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.     

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.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.