智能家居系统网关的设计与实现

针对蓝牙网络与Internet网络间通信协议不兼容的问题,本文利用低功耗蓝牙4.0技术与以太网通信技术,设计了基于蓝牙4.0技术和以太网技术的智能家居网关.硬件设计采用集成了ARM Cortex-A9核心的Zynq 7000开发平台作为核心处理器,利用平台上连接的CSRI010蓝牙模块与智能家居系统中家居设备相通信,通过双绞线将平台上的以太网网络接口与路由器相连进行远程通信.软件设计方面,基于Linux操作系统实现在蓝牙网络和Internet网络之间进行数据通信的功能.实验测试结果表明,本文所设计的网关具有较低数据丢包率、数据处理时延及功耗,可保证智能家居系统中家居蓝牙网络与Internet网络通信具有良好的准确性与实时性.     

一种超低功耗锂离子电池保护电路设计

基于减少锂离子电池能量的额外损耗,设计了一款超低功耗锂离子电池保护电路.本电路不仅可以对锂离子电池进行全面有效的保护,而且实现了低功耗.利用MOSFET的亚阈值导电特性,使电路消耗的电流小于3μA;并且芯片在检测到过放电时进入到休眠状态,此时电路消耗的电流仅为0.2μA左右,大大减少了不必要的能量损耗.     

基于BQ24060的锂离子电池充电器的设计

锂离子电池充电器的发热问题一直是电子工程师在进行锂离子电池充电器设计时的难点之一,如果设计不周密,会带来安全问题.这里介绍了TI公司的锂离子电池充电器专用芯片BQ24060的技术特点,详细叙述使用BQ24060芯片设计锂离子电池充电器时热调节保护功能的设计方法及要点,并给出了典型应用电路.经过实践验证,该方案达到了预期的目标.     

蓝牙技术联盟即将推出面向通用远程控制的新蓝牙标准

蓝牙技术联盟（SIG）日前宣布,即将发布的蓝牙低功耗规范将满足消费产品行业对通信交互式远程控制的需求。蓝牙低功耗技术将支持低成本、超低功耗应用,目前正在开发当中,预计于明年发布。蓝牙低功耗技术专门设计用于需要超长电池寿命（数年而不是数小时）的设备,面向需要在不同厂商的产品间实现交互的人群。这些特性使蓝牙低功耗技术非常适用于远程控制设备。     

锂离子电池用保护电路的低功耗设计

设计了一种单节锂离子电池保护电路。分析了系统的特点和应用要求,提出了采用亚阈值电路和由内部数字信号来控制模拟电路工作状态的方法,优化了系统的功耗。电路采用0．6肛mUMC数字电路工艺实现。HSPICE模拟结果表明,该电路不仅能满足锂离子电池应用中的保护要求,而且具有较低的电流功耗,在正常和Standby模式下。系统消耗电流分别3．23μA和0．15μA。     

低功耗蓝牙芯片可提供高质量语音

语音是蓝牙技术最基本的使用形式,近年来,人们对语音质量以及更长的电池使用寿命要求也是越来越高.     

锂离子电池的安全性能评价技术

锂离子电池是一种更高效、更环保的储蓄电源设备,随着现代科技技术不断的发展,锂离子电池深受人们的喜爱,并将其广泛应用到各种电子产品中。但是,锂离子电池在使用过程中一些细小的结构缺陷会存在着一些安全隐患,对使用者的人身健康造成了一定的威胁,同时我国在锂离子电池检测过程中其技术也落后于锂离子电池技术的发展。因此,为了锂离子电池的安全性能问题,本文对锂离子电池的安全性能评价技术进行了简单的分析。     

一种超低功耗锂离子电池保护电路设计

基于减少锂离子电池能量的额外损耗,本文设计了一款超低功耗锂离子电池保护电路。本电路不仅可以对锂离子电池进行全面有效的保护,而且实现了低功耗。利用MOSFET的亚阈值导电特性,使电路消耗的电流小于3μA;并且芯片在检测到过放电时进入到休眠状态,此时电路消耗的电流仅为0．2μA左右,大大减少了不必要的能量损耗。     

锂离子电池常见问题与技术研究

锂离子电池如今的应用范围很广,手机、笔记本等便携式电器中都可以见到。对人们的生活产生越来越重要的影响。锂离子电池容量大、体积小、价格低、无污染,可以应用的范围和空间是无可限量的。因此,对锂离子电池的技术研究是非常必要的,研究锂离子电池的使用中的问题和常见的解决措施,关注锂离子电池技术的最新发展,意义重大。     

Wibree前景正在超越Bluetooth

蓝牙无线通讯技术的复杂性和随之而来的高功耗一直是其最大缺陷之一,诺基亚(Nokia)针对这些问题开发了超低功耗的Wibree技术,使无线通讯设备用纽扣电池即可使用数年时间,而且应用范围十分广泛.     

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.