高性能的MIL-STD-1773光纤数据总线系统

本文综述了我们对1773光纤数据总线系统的研究工作进展。建立的1773光纤数据总线系统满足舰船电子设备环境使用条件,研制工作充分考虑了实时控制的特殊要求,所进行的工作独立于具体的舰船型号和用途,不受具体应用的限制,因此这些技术可以扩展到其他各种军事及工业实时控制系统中应用。     

1773数据总线光收发器的设计与测试

文章介绍了一种能够独立传输MIL-STD-1773协议的光收发器.该系统采用全直流耦合,支持突发工作模式,具有接收灵敏度低(≤-20 dBm),动态范围大(≥10 dB),传输距离远等特点.文章重点介绍了系统的应用背景、设计方案、工作原理、控制电路设计、输出曲线分析以及测试得到的主要参数.     

基于MIL-STD-1773B总线的光收发技术

基于MIL-STD-1773B总线传输技术,设计并研制了能够独立传输1773协议的光收发模块,具体分析了三电平技术的传输方案.该光收发模块由输入脉冲整形、脉冲调制、光源驱动、光电转换、前置放大、自动增益控制和比较电路组成,设计采用全直流耦合,支持突发工作模式,具有接收灵敏度高,动态范围大,传输距离远的特点.     

基于LTC1773芯片的锂离子电池稳压电路

<正> LTC1773是美国凌特公司研制的电流型同步调流降压控制芯片,通过驱动使外接的一对互补功率 MOS 管工作。内部工作频率为550kHz,可以使用表面贴装电感,在对开关噪声敏感的应用中可同步至750kHz。输入电压范围2.65～8.5V,使其适合于以1或2节锂离子电池供电的应用。输出电压从0.8V 到输入电压。具有很低的静态电流、关断电流和高达±1.5%的精度,并有软启动功能。可通过外接高精度电阻对峰值电流进行控制。LTC1773可广泛应用于由单或双锂离子电池供电的装置、移动设备、分布电源系统、笔记本电脑和掌上电脑及 PDA 中。引脚功能LTC1773采用10脚的 MSOP 塑料封装,其引脚排列如图1所示,管脚功能如附表所示。     

便携式媒体播放器电源管理方案

MAX8819A集成了3路2MHz降压转换器和一路具有串行步调亮度控制的28V升压转换器,用于驱动2～6个WLED,在整个负载范围内效率高达95％。其智能电源选择器电路控制电池、USB／ACDC适配器和系统负载之间的电源分配。当连接USB或AC／DC适配器时,系统负载没有用到的那部分输入电源对电池充电。     

Maxim双向同步PWM控制器

Maxim公司推出MAX5071A/MAX507lB高性能、单端、电流模式PWM控制器，用于隔离型电信DC／DC电源或通用离线输入AC／DC电源。这些芯片与业界标准、多源UC2842／UCC2842及UC2844／UCC2844系列产品实现引脚兼容，只更换很少器件，便可提升现有电源设计性能。MAX5071A/MAX5071B的双向同步输入允许多个电源工作在相同频率下，可消除由于电源工作在不同频率下造成的差频。     

大功率、高效HB LED驱动器

MAX16033／MAX16040内置精确的电源监视以及电池控制功能，可提供多种功能，包括μP复位、电池备份切换、电源失效报警以及片选控制。     

Maxim线性稳压器为笔记本电脑提供25μA静态电流

美信集成产品公司(Maxim lniegrated Producls)近日摊出从两款小型、高电压输入线性稳压器——MAX8718和MAX8719，可为使用高电压电池系统中的CMOS RAM、实时时钟(RTC)和微控制器提供小问断电源25μA的低静态电源电流能够满足这些低功耗应用的要求。     

集成度最高的微处理器监控电路，提供电池备份和片选控制

Maxim推出具有精确电源监测和电池控制功能的低功耗（〈1．2uA）、微处理器（uP）监控电路MAX16016／20／21／23／24。该监控电路提供小型TQFN或TDFN封装,具有优异的性能。器件集成多种功能,包括uP系统复位电路、备份电池切换、电源失效报警、以及片选（CE）控制。这种高度集成的特性简化了设计,极大地减少了电源监测所需的元件数量。MAX16016／20／21／23／24是销售终端（POS）装置、工业设备、传真机、计算机和机顶盒等多种应用的理想选择。     

SMB136／7B：电池充电器

Summit推出第三代可编程电池充电器系列，SMB136和SMB137B采用Current Path技术，具有可判断的双输入电源（USB或AC／DC）。在电池没电或丢失情况下，为系统和电池以及系统运行提供双输出电源。     

AS1773航空光纤总线调制机制的研究

针对航空光纤总线传输系统设计中接收机三种状态识别难这一关键问题,首次引入了双脉宽曼彻斯特编码调制机制,经过误码率与灵敏度估算,仿真结果表明,双脉宽曼彻斯特调制机制接收机比SAE-A2K光纤工作组推荐的光调制机制的灵敏度高.FPGA仿真设计实现表明,该调制机制具有实现难度低,而且能有效解决接收机三种状态识别的问题.     

在MIL-STD-1773控制下用于航空电子的高速光纤局部网络

本文详细叙述了所研制的用于航空电子系统综合的高速光纤局部网络,包括网络通信访问协议、网络的拓扑结构、网络接口及网络传输等方面的研究结果。它遵守MIL-STD-1773/STANAG3910规范。     

光纤化的飞机内部时分制指令/响应式多路传输数据总线标准(供讨论稿)

本文是对“光纤化的飞机内部时分制指令/响应式多路传输数据总线”标准的建议,是根据MIL-STD-1553B及1773文本拟订的。     

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.