基于FM20L08铁电存储器的实时数据采集系统

铁电存储器以其易用、快速、非易失以及越来越大的存储容量吸引了很多电子工程师的关注。文中介绍了FM20L08铁存储器的主要特点以及FM20L08与单片机的连接及编程方法．同时给出了一款用铁电存储器保存数据的实时数据采集系统的设计方法。     

基于FM18L08的高速数据存储系统

FM18L08是Ramtron公司新近推出的一种新型铁电随机存储器。该存储器克服了EEPROM和Flash器件写入时间长、擦写次数少等缺点，而且价格也相对不高。文章介绍了FM18F08的主要特点和引脚功能，并在此基础上给出了基于FM18L08的高速数据存储系统的设计方案。同时给出了FM18L08存储器与单片机的接口连接电路。     

基于FRAM的海水深度记录仪

设计了一种以铁电存储器FM20L08为非易失性存储器,C8051F020为数据采集核心的海水深度自动测量仪.     

Ramtron发布可替代SRAM的1兆位铁电存储器(FRAM)

非易失性铁电存储器开发及供应商—Ramtron国际公司宣布推出兆位的铁电存储器产品—FM20L08。此型号的操作电压为3-volt、32-pinTSOP(thinsmallout-lineplastic)封装。FM20L08是Ramtron目前生产的容量最大的铁电存储器,可以对其进行无限次的读写操作。该型号是专门设计用来替换标准异步静态随机存储器的。同时,这个型号还特别适用电压多样或者电压会突然丢失的存储数据系统,如机顶盒、汽车远程信息处理以及工业应用等系统。作为对Ramtron现有并口铁电存储器型号重要补充,FM20L08在地址转换检测(ATD)方面可以与SRAM完全兼容,它允许…     

并行接口铁电存储器FM1808及其应用

RAMTRON公司生产的并行接口高性能铁电存储器FM1808是NV -SRAM的理想替代产品。文中介绍了FM1808的性能特点、引脚功能和工作原理 ,同时重点介绍了铁电存储器的应用特点及与其它类型存储器之间的应用差别 ,给出了FM1808的设计应用要点     

Ramtron可替代SRAM的1兆位铁电存储器

Ramtron国际公司（Ramtron International）宣布推出1兆位的铁电存储器产品——FM20L08。此型号操作电压为3伏，采用32引脚TSOP（薄型小尺寸封装）封装。FM20L08是Ramtron目前生产的容量最大的铁电存储器。该型号专门用来替换标准异步静态随机存储器（Standard asynchronous SRAM）。同时，该型号还特别适用电压多样或者电压可能突然消失的存储数据系统，如机顶盒、汽车远程信息处理以及工业应用等系统。     

串行FRAMFM25H20原理及其应用

介绍非易失性铁电存储器FM25H20的性能特点,内部结构和工作原理;给出单片机与FM25H20的写操作接口电路图.以及FM25H20的写操作流程图.归纳出任何一款8位数据总线宽度用于计算机系统时使用FM25H20的方法.从而实现大客量存储系统的扩展.     

可替代SRAM的1兆位铁电存储器

Ramtron国际公司宣布推出1兆位的铁电存储器产品——FM201．08该存储器的工作电压为3Y，采用32引脚TSOP封装，FM20L08是Ramtron目前生产的容量最大的铁电俘储器，可以对其进行尢限次的读写操作。该型号是专门设计用束替换标准异步静态随机存储器的（SRAM）。同时．这个型号还特别适用电压多样或者电压会突然丢失的存储数掂系统，如机顶盒、汽车远程信息处理及工业应用等系统。     

基于铁电存储器FM18L08的固态记录仪设计

采用了一种新型的铁电存储器，介绍了他与现有其他存储器的不同之处，并在此基础上开发了基于FM18L08的弹载测试装置，有针对性地给出了硬件和软件的设计细节和漉程图，经模拟试验证明，达到了预期的测试要求．     

FM3164在火灾自动报警系统中的应用

FM3164是RAMTRON公司推出的新一代非易失性铁电存储器,采用I2C总线,是集串行存储器、实时时钟、看门狗、复位电路、低电压检测等多种功能于一体的强大芯片.与其他串行存储器相比,FM3164具有没有写延时,读写次数可达上百亿次,速度快,功耗低等优点.主要介绍FM3164的组成原理和基本功能,并结合它在火灾自动报警系统的应用给出实际应用方法,实现报警过程中信息快速、准确的存储.     

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.     

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.     

Curved crystal spectrometer for the measurement of X-ray lines from laser-produced plasmas

In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal （200） （2d = 0.4027 nm） is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line（w）, the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line（x）, the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines（y）, the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line（z） in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line（q） in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution（λ/△ 2） is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.