一种恒流输出大屏幕LED驱动CMOS芯片的电路设计

LED显示屏已经成为各类户外户内的广告宣传展示的首选媒介。LED以其寿命长,功耗低节能环保的优点,深受照明和显示行业的欢迎。因此,LED的驱动芯片在市场上也有很大的需求。本文介绍了一种恒流输出大屏幕LED驱动CMOS芯片的设计,工作电压范围是3.3V-5.5V,工作温度范围是-40℃-125℃。该驱动芯片对恒流输出和各路匹配性进行针对性的设计。以外接电流共同调节16路恒流电流大小,串行数字输入输出分别控制16路使能状态,使能端输入PWM信号,对恒流输出进行脉宽调节。该芯片使用HSPICE软件仿真工具设计,并采用HYNIX0.5μm工艺制作,测试验证结果表明,各路恒流输出位间电流误差最大为±2%.     

基于TOPSwitch-JXLED恒流驱动器的设计

文中以设计一种精密高效的LED恒流驱动电源为目的,采用TOPSwitch-JX系列智能集成芯片实现了一款恒流驱动器,经过实际性能测试,得到了稳定的输出电流,达到LED恒流驱动的要求。     

恒流LED驱动芯片让LED显示屏轻松升级

聚积科技推出具有可编程电流增益功能以及讯息中错误侦测功能（In—Message Error Detection）的新一代恒流LED驱动芯片MBI5036,让LED全彩显示屏轻松升级。MBI5036是一款专为全彩LED显示屏设计的16信道恒流LED驱动芯片,可支持3mA～60mA的恒流电流输出范围,耐压高达17V,并可提供高达30MHz的数据传输速率,以提供数据传输带宽。     

天津光电星球阳光显示技术有限公司LED全彩显示屏简介

LED全彩色显示屏是集微电子技术、光学技术、计算机技术、信息处理技术于一体的大型显示系统。产品采用日本及美国进口高亮度发光二极管或三合一表贴发光二极管,灰度等级达到1,024级,图像分辨率最高可达1,280×1,024。其驱动控制系统采用恒流驱动芯片使LED显示屏的控制更良好、     

基于TPS61040的恒流源白光LED驱动设计

本设计的白光LED恒流驱动主回路是以高频低功耗升压转换器TPS61040为核心,利用MSP430F149的低功耗特性,采用其内部12位AD采样,配合外部12位DA芯片TLV5616实现对5个白光LED恒流电路的控制和设定,使用按键对输出电流实现准确步进,为了必要的显示功能,还配备了12864液晶对采样电流值进行显示。系统电路结构简单,灯光亮度可按键控制,避免了现在市面上存在的驱动电路复杂、效率低等缺点。     

基于TLC5902的LED图像显示屏的驱动控制

TLC5902是美国Texas Instruments公司生产的专门用于图像显示的LED驱动芯片，该器件集移位寄存器、数据锁存器于一体，同时带有电流值调整恒流电路以及脉宽调制256级灰度显示恒流驱动器。文中介绍了该器件的主要功能及实际应用方法。     

一种电流检测PFM型LED驱动IC的设计

基于开关电源系统基本理论,采用电流检测脉频调制(PFM)模式,设计了一种新型大功率LED照明恒流驱动芯片.利用0.5μm CMOS工艺模型仿真,结果表明,该芯片具有高电源抑制比、2.5～400V宽输入电压范围、10 kHz～2.5 MHz可调工作频率和多种保护功能,LED驱动电流范围为几mA到1A,可驱动1个到几百个LED灯,特别适合大功率恒流驱动.     

一种乱序PWM控制的LED恒流驱动芯片

基于CSMC 0．5μm标准CMOS工艺,设计了一款乱序PWM控制的LED恒流驱动芯片．芯片电路使用乱序PWM技术提高LED的刷新速率,采用PWM合成技术提高LED的色彩灰度等级,利用恒流驱动技术降低LED的光衰．在电源电压为3V～5．5V、温度-40～85℃条件下,基于Cadence平台中的Spectre进行仿真验证．仿真结果表明：LED的刷新速率跟随输入的影像数据大幅度提高;PWM 合成模式实现14位LED显示灰度,点校正模式可以完成6位的色度修正;输出电流误差为±5％．     

一种基于原边反馈控制的LED恒流驱动芯片

基于原边反馈控制技术,提出了一种具有功率因数校正功能的反激LED恒流驱动控制芯片。分析了原边反馈控制的反激LED驱动电路的原理,提出一种新颖、结构简单的恒流控制电路,提高了输出恒流精度。采用谐振谷底开通的开关方式,降低了功率MOS管的开关损耗。该LED驱动芯片基于CSMC 1 μm 40 V BCD工艺设计。仿真结果表明,在90~270 V输入范围内,该LED驱动电路的功率因数大于0.98,输出电流误差小于0.5%。     

车用仪表背光灯的LED线性恒流驱动电路设计

阐述了可用于车用仪表背光灯的高精度LED线性恒流驱动芯片设计,重点讨论在设计并联方式LED线性恒流驱动电路时如何消除连线分布电阻的影响,并推出一种新颖的可消除连线分布电阻影响的电路,最终通过电路模拟测试加以验证.研究结果表明,在设计高精度、高稳定性、大电流、并联方式LED线性恒流驱动电路时,消除连线分布电阻影响很有必要...     

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.     

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.     

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.     

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.     

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.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first