CMOS电路芯片ESD保护电路设计技术的发展

本文简要地回顾了ＣＭＯＳ电路芯片上ＥＳＤ保护电路设计技术发展概况，给出了在中小规模、大规模及超大规模各阶段的ＣＭＯＳ电路芯片上ＥＳＤ保护电路的主流技术，双寄生的ＳＣＲ结构ＶＬＳＩ ＣＭＯＳ芯片上ＥＳＤ保护电路的最新设计技术，就其ＥＳＤ保护原理、设计技术及取得的成果做了较详细分析和探讨。对于研制高密度、高速度的ＶＬＳＩ ＣＭＯＳ电路。开展高ＥＳＤ失效阈值电压，小几何尺寸及低ＲＣ延迟时间常数保护电路的     

HFC网络CDMA时隙ALOHA接入系统性能分析

同步ＣＤＭＡ（Ｓ－ＣＤＭＡ）解决了双向ＨＦＣ系统上行信道的噪声和容量问题,基于Ｓ－ＣＤＭＡ的ＨＦＣ是一代的ＨＦＣ系统,初始接入ＣＤＭＡ终端是采用时隙ＡＬＯＨＡ技术完成接入进程的,把ＣＤＭＡ技术与时隙ＡＬＯＨＡ技术相结合,会使原来的时隙ＡＬＯＨＡ技术的吞吐量得到一定的改善。本文提出了一种ＨＦＣ网络ＣＤＭＡ－时隙ＡＬＯＨＡ接入系统,分析了该系统的吞吐量性能和接入时延性能,并给出了实验结果与分析。     

ADSL的操作和维护

阐述了ＡＤＳＬ中ＥＯＣ的功能，ＥＯＣ帧结构，ＥＯＣ命令，以及ＥＯＣ协议，对在ＡＤＳＬ数据帧中插入ＥＯＣ帧这一问题也进行了讨论。     

LCOS投影技术及其市场分析

ＬＣＯＳ(ＬｉｑｕｉｄＣｒｙｓｔａｌｏｎＳｉｌｉｃｏｎ)属于新型反射式微型液晶显示 (ＬＣＤ )投影技术。它与显像管(ＣＲＴ)投影技术、高温多晶硅液晶 (Ｐｌｏｙ ＳｉＬＣＤ)穿透式投影技术和数字光学处理 (ＤＬＰ ,ｄｉｇｉｔａｌｌｉｇｈｔｐｒｏｊｅｃｔｏｒ)反射式技术相关。这 3项业已成熟的技术推动着ＬＣＯＳ使之将成为投影显示器的新主流。ＬＣＯＳ适用于 30～ 6 0英寸以上的大屏幕投影显示器 ,也可作为直观元件 ,具有乐观的潜在市场。若能提高制造过程中后道工序的良品率。提高性能价格比 ,ＬＣＯＳ必将成为显示器件市场上的佼…     

ORACLE系统的管理策略(下)

四、加载器（ＯＤＬ）及其应用在ＯＲＡＣＬＥ系统中，有一个加载器（ＯＲＡＣＬＥＤＡＴＡＬＯＡＤＥＲ），它是一个非常有用的ＤＢＡ工具。它可用来把放在操作系统文件中的数据加载到ＯＲＡＣＬＥ数据库表中。这个数据文件可由应用程序产生，也可由用户使用编辑程序产生...     

PROTEL图形在CorelDraw软件中的处理及应用

文章通过对ＰＲＯＴＥＬ和ＣｏｒｅｌＤｒａｗ两个软件包的分析,提出了利用ＣｏｒｅｌＤｒａｗ作为工具,打印ＰＲＯＴＥＬ图形,以及插入ＷＯＲＤ文档中的方法。同时介绍了使用ＣｏｒｅｌＤｒａｗ处理ＰＲＯＴＥＬ图形的进一步应用,以及将ＰＲＯＴＥＬ图形插入ＷＯＲＤ文档中的实用技巧     

ZnO变阻器低压化研究及其在LCD中的应用

本文阐述了ＺｎＯ变阻器在两端有源矩阵ＬＣＤ器件的应用，指出该元件是驱动ＬＣＤ良好的非线性元件。针对ＺｎＯ变阻器阈值电压高的不足，通过改变材料配方，采用ＴｉＯ２添加剂取代传统传统配方中的Ｓｂ２Ｏ３添加剂，并选择合适的工艺参数，研制出了满足ＬＣＤ应用的低阈值电压高非线性系数的ＺｎＯ变阻器。     

宽视角液晶显示器新进展

ＬＣＤ最严重的问题之一是视角窄，在扩大视角方面文献中途议的方法很多。本文介绍的三种方法是：双畴结构模式（ＤＤ）ＴＮ－ＬＣＤ，光学补偿弯曲结构模式（ＯＣＢ）ＬＣＤ和轴对称结构模式（ＡＳＭ）ＬＣＤ，这是因为它们在改进ＬＣＤ视角特性上是最有效的，也是最实用的。     

基于SDLC环的高速同步通信及其实现

基于ＳＤＬＣ环的高速同步通信及其实现唐文运同步数据链路协议（ＳＤＬＣ）是ＩＢＭ的所提出的计算机通信网中数据链路层的同步通信规程，它已由国际标准化组织认可，成为高级数据链路协议（ＨＤＬＣ）。在此基础上产生的环模式（ＳＤＬＣＬＯＯＰ），原用于ＩＢＭ的３６...     

SDLC的空间链路连接

ＳＤＬＣ是ＩＢＭ地面网的数据链层协议，本文以ＨＵＧＨＥＳ ＩＳ－ＢＮ系统为例，阐述了ＳＤＬＣ在空间链路上的处理，ＳＤＬＣ协议与ＯＤＬＣ协议转换，地面线路和空间链路的连接和传输模式。     

随机宽线检测方法

为消除基本宽线检测算子中的冗余计算量,提高算法的运算速度,该文提出一种宽线算子的快速实现方法随机移动宽线算子。基本宽线算子采取逐像素移动模板的方式检测图像中的宽线特征,与之不同,随机移动宽线算子在检测时,随机地在图像中放置检测模板,并根据当前像素类型采用启发式的准则确定模板移动的策略,从而加快了模板移动速度,较好地消除了基本宽线检测算法中的冗余运算;在此基础上,提出了两种提前结束条件,可根据检测情况提前结束循环,进一步节省了运算量。利用测试图像对快速算子进行了实验分析,结果表明,随机移动宽线算子在取得相当检测性能的同时,提高了基本宽线算子的运算速度。     

The future of UHV transmission lines

In predicting the future of UHV transmission lines, the author has followed a twofold approach. First, a quantitative analysis is made of the characteristics of future UHV lines, as conceived in the light of present-day techniques. Second, new solutions considered particularly suitable for UHV lines are discussed. Two basic assumptions are made: (1) that the need to transmit ever-greater quantities of electric energy by overhead lines will continue and (2) that society will become increasingly concerned over esthetic considerations.     

一种有效的平面曲线关键点检测新方法

平面曲线的关键点检测可用于数字曲线的直线段逼近,因此在很多图像识别、测量及分析的场合均有重要应用.由于一般的数字直线均为若干连续的水平、垂直、±45°夹角直线段合成,称之为四个基本方向,并将每个基本方向的最大直线段长度定义为其方向象素长度(directional pixel length,DPL).提出了四个定理,证明了在相互垂直方向上的DPL不会同时超过1个象素,而45°夹角方向上DPL不会同时超过2个象素.在此基础上,提出并设计了一种全自动关键点检测算法.通过和现有典型算法的实验对比,验证了该方法在减少关键点数和时空开销方面的显著优势.     

Resonance Measurement of Single- and Coupled-Microstrip Propagation Constants

The application of resonant techniques to the measurement of microstrip-line propagation constants is described. A review of the basic theory is given first, showing the great generality of the underlying principle. Then the particular case of a transmission line is discussed and it is shown that excellent theoretical accuracy can be achieved despite the simplicity of the procedure and the mathematics involved. Both the cases of nondispersive and dispersive propagation are covered. Finally, it is shown that the basic method can be extended to the case of symmetrical coupled lines in a straightforward way. Some results concerning practical microstrip lines are presented and compared with theoretical data.     

The use of stabilized CMOS delay lines for the digitization ofshort time intervals

The basic advantages and limitations of using integrated digital CMOS delay lines for the digitization of short time intervals are discussed. Accuracies of 6-7 b and single-shot resolutions from 0.1 to 10 ns are demonstrated to be realizable using fully integrated, tapped, and voltage-controlled CMOS delay lines as a time base for the measurement     

Raman scattering in organic semiconductors based on erbium biphthalocyanine molecules and chlorine-containing europium-lutetium triphthalocyanine molecules

The Raman spectra of semiconductor structures based on erbium biphthalocyanine molecules and chlorine-substituted europium-lutetium triphthalocyanine molecules are studied on excitation with Ar⁺ laser radiation at the wavelength 514 nm. The data on the spectral position of Raman intensity peaks related to vibronic states of the basic molecular groups forming the semiconductor are obtained. Raman lines irrelevant to the known vibronic states of the basic phthalocyanine molecular groups are observed in the ranges 100–500 and 500–900 cm⁻¹. It is shown that, in the spectra of triphthalocyanine, some lines are structurally complex and shifted with respect to the characteristic lines of molecular groups by several inverse centimeters.     

椭圆微带线色散特性的直线法分析＊

本文用直线法对椭圆微带线的色散特性进行了研究,导出了色散特性方程.在共焦椭圆情况下,当频率较低时,本文结果与准TEM波分析结果趋于一致。同时给出了两种微带结构的色散曲线。     

Rethinking X-ray lithography

A viable alternative to synchrotron-based fabrication lines is discussed. These are collimated point X-ray sources that will cost a fraction of the price of synchrotrons. The two basic configurations for X-ray lithography-proximity and projection-are explained. Two basic methods for collimating the sources are described, and the advantages and disadvantages of each are examined     

Advances in Developing Transitions in Microwave Integrated Circuits

Advances in developing transitions in microwave integrated circuits during the last ten years are reviewed. Some typical structures of transition are introduced, Transition structures can be classified into two basic types: one is transition between the same ]rind of transmission lines on different planes of a common substrate, the other transition between different types of transmission lines.Furthermore, future development of transition structures is discussed.