打印机用新型激光驱动器

日本三菱电机公司推出一种用于激光打印机的半导体激光驱动器,型号为M6651OP/FP,工作速度为20Mbps,可减少驱动电路。此驱动器包含一个激光驱动调节电路和高速开关,在一块芯片上还集成有监视输出电路,光电二极管电流为激光器输出电流,驱动电流高达120mA,为     

电源技术

同步降压/升压型白光LED驱动器凌特推出同步降压/升压型DC/ DC转换器LTC3452,该器件优化了采用单节锂离子电池以驱动两组白光LED的应用。LTC3452可驱动5个并联的LED,而每个LED的驱动电流高达25mA,可为LCD显示屏提供背光照明。该器件还可驱动两个LED,而每个LED的驱动电流高达200mA(或者一个LED,驱动电流为400mA)以用于相机     

光电器件与显示器

美国国家半导体高频白光LED驱动器美国国家半导体公司(NationalSemiconductor)宣布推出一款设有高速脉宽调制(PWM)亮度控制功能的小型高频白光发光二极管驱动器。这款型号为LM3519的驱动器芯片适用于手持式系统,可为多达4个白光发光二极管提供稳定的驱动电流。移动电话、MP3播放机、条码扫描器及其他便携式电子产品都可利用这款驱动器为其高清晰度显示器提供背光。LM3519驱动器芯片是一款高效率的发光二极管驱动器,设有内部稳流功能,无需加设外置电阻也可为每一发光二极管提供20mA的驱动电流。驱动器芯片只需将PWM信号输入允许引脚,…     

一种新型移相驱动器的设计

设计了一种新型移相驱动器,它在常规移相驱动器的基础上集成了D/A转换器、积分器、比较器等多种电路.该电路具有功耗低(≤5 mA),驱动能力强(驱动电流≥±30 mA),可靠性高等优点,符合移相驱动器高精度、高集成度、小型化的发展方向.     

SLED光源的恒温恒流控制系统研究

采用以单片机为核心的控制电路和PID控制算法,对SLED的温度和驱动电流进行高精度的控制,使工作温度可在0℃～30℃设定范围内稳定到±0.01℃以内,驱动电流在20mA～200mA设定范围内可稳定在±0.02mA以内,满足了光纤传感系统对光源光谱分布和输出功率稳定性的需要。     

STP24DP05：RGB LED驱动器

意法半导体推出驱动电流高达80mA的24路叵流输出RGBLED驱动器STP24DP05。在一个7×7mm的TQFP48封装内，新产品效能相当于三个普通的8路输出驱动器。     

高集成度RGBLED驱动器

STP24DP05是驱动电流达80mA的24路恒流输出RGBLED驱动器。其支持25MHz操作,采取串行输入、并行输出的FIFO（先入先出）驱动电路。每个颜色组的八个输出使用一个外部电阻器,通过这个电阻器能在5～80mA范围内调节每个LED通道的驱动电流,可以独立优化红、绿和蓝光通道的最大亮度。     

基于STM32的半导体激光光源驱动器的设计与实现

为实现半导体激光光源驱动器的工程化,设计了一套低功耗、低成本的实用型光源驱动器。该驱动器以ARM微控制器STM32F103VCT6为核心,以TEC控制器MAX1968为执行器件,配以相应的软件,以模糊PID计算控制量。实验证明,设计的控制器实现了半导体激光器驱动电流和温度的精密控制,温度控制精度可达到±0.03℃,激光输出功率稳定度可达到0.002dB,具有高性价比和高集成度。     

设定值不易失的数字电流源

可数字编程的电流源能自动微调,而且即使处于节能工作状态周期也能保存设定值,因此在诸如射频通信驱动器和激光通信驱动器等设备中是很有用的。例如,图1所示的电路特别适合在调谐范围很大的VCSEL(垂直腔表面发射激光器)中设定光泵的驱动电流。这种激光器适用于使用波长捷变DWDM光纤通信链路的系统。图1所示电路可输出一个稳定的驱动电流,而这一电流是由DPP(数字编程的电位器),即Calalyst     

带有诊断监视器的激光驱动器MAX3740及其应用

MAX3740A是带有诊断监视器的高速VCSEL驱动器,可输出15mA激光调制电流和15mA偏置电流,并可在温度和激光器特性发生变化时通过自动功率控制（APC）来调整激光偏置电流以保持恒定的平均光功率。     

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.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

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