存储器

用于扩展32KB SPI串行E2PROM的高速器件Microchip推出25AA320A和25LC320A(25XX320A)器件以扩展其32KB SPI串行E2PROM系列。这些器件有助于客户将32KB设计轻松升级至     

用有机电致发光二极管与a~-SiC:H膜组合制作空间寻址光变换器

设计出一种新型光变换器,它是在作为电光注入电极的光导非晶碳化硅(a—SiC:H)膜上制作有机电致发光二极管所构成。由光敏 a—SiC:H 膜接收到的输入光转换成由层状结构中 EL 二极管发射的不同波长的输出光。输出光的空程分布很好地保持了输入光的图形。用加到器件上的直流电压和入射光强可实现对电致发光输出光的控制。这些特点建议,上述器件可用于一种新型空间光调制器。     

OSD芯片具有OSD字符／图形功能

安全监控领域要求视频系统能够根据需要产生文字、图像,并将其叠加到视频图像,为了满足这一需求,Maxim推出了单通道、单色随屏显示(OSD)发生器MAX7456.MAX7456内置非易失存储器(E2PROM),器件集成了所有用于产生用户定义的OSD字符/图形,并将其插入视频信号中的功能,兼容于NTSC和PAL视频标准.     

硬件

0624692三维光学存储系统中补偿折射率失配的复振幅分布= Complex amplitude distribution for compensation of re- fractive index mismatch on 3D optical storage recording system[刊,英]/陈建农//上海大学学报(英文版)．—2006,10(3)．—219-233(E) The complex amplitude distribution which can com- pensate for the spherical aberration caused by mismatch on interface between recording material and immersion material(air)on three-dimensional optical storage system is derived analytically and numericauy.Comparison be- tween two approaches is made. 0624693 PROM器件中Ni-Cr熔丝的设计[刊,中]/孙承松//沈阳工业大学学报．—2006,28(3)．—315-317(C)介绍了应用在PROM器件中的Ni-Cr熔丝电阻的设计。熔丝是决定PROM器件稳定性的关键元件。Ni-Cr薄膜材料有良好的半导体加工特性和温度稳定性。通过热学分析和测试实验。得到相关数据,设计出熔丝形状以及三维尺寸。再根据此集成电路器件的整体版图布局设计出可应用到PROM中的Ni-Cr熔丝。采用磁控溅射方法,通过控制工艺条件得到所需的薄膜厚度,经光刻形成所需图形。通过产品的读取测试实验,取得了良好的效果。参9     

投影显示用数字微反射镜器件

数字微反射镜器件(DMD)是得克萨斯仪器公司(TI)研制的,它是一种利用硅基微电子机械系统的(MEMS)反射式空间光调制器。调制器阵列中的每个小反射镜能够单独控制,使入射光线进入或者偏离于透镜的通光口径。虽然这种技术已广泛地用于图形识别和光纤互连,然而TI确把投影显示选为这种技术的商业应用市场。1.数字化微反射镜器件工作原理和结构     

用E~2PROM代替EPROM及SRAM的通用方法

E~2PROM是电可擦除电可改写的只读存贮器。近年来INTEL公司、XICOR公司、TRISTAR公司等相继推出了2816A、2817A、2864A等新型E~2PROM器件。这种新型E~2PROM器件的主要优点是内带V_(pp)编程电源,可以使用单一+5V电源擦除和写入,而不必外加V_(PP)编程电源及紫外灯,使用十分方便。虽然它的价格比EPROM贵得多,但由于它具有上述优点,所以仍然得到了迅速地推广和应用。     

晶体光阀显示

本文论述了国外晶体光阀的研制和发展情况,主要包括DKDP光阀,BGO光阀和PLZT光阀.另外还简单地介绍了用作全息存贮的PROM和铁电光折射器件,并在第二部分叙述了作为晶体光阀物理基础的普克尔斯效应.我国晶体的研制和生产都有一定基础.如何将各种新晶体引入信息存贮显示领域是个很值得重视的问题     

一种新型的有安全保护的存贮器

介绍了一种适用于保密通信的密钥存贮和其他需要安全保护的信息存贮等多种场合的新型加密存贮器(E~2PROM)。接着简述了这种E~2PROM的特点、操作规则、器件的协议以及配置情况。     

光伏焦平面器件串音效应的检测图形测试法

根据长波红外焦平面器件研制的需要，在对器件串光效应和测试原理进行分析的基础上，本文首次提出用检测图形测试的方法测量红外焦平面阵列中探测器之间的串音效应。对用于检测光伏焦平面阵列光串音效应的检测图形的结构和原理，具体的测试设备和测试方法，以及由结构设计差异和检测管响应率差异可能引入的误差进行了讨论，并根据红外长波焦平面器件研制过程中的实际测试经验，给出了实用的误差消除方法。在长波ＨｇＣｄＴｅ焦平面阵列的实际研制过程中，该方法对工艺机理的分析和器件参数测试都起了重要的作用。此测试法所用测试设备与常规光电器件测试设备相同，避免了在串音测试上依赖于目前尚不成熟的红外长波小光点技术。     

亚微米图形曝光机

最近日本加农公司发表了一种用于超大规模集成电路的高精度投影曝光机,并已出售商品,以前人们普遍认为投影曝光方式,在大规模集成电路等微米领域的图形制作中是很有效的。但若用于超大规模集成电路等亚微米领域是不太可能的。加农公司采用综合透镜技术制出了超高分辨率透镜,进而打破了投影曝光方式不能用于亚微米技术的错误结论,成功地制出了亚微米图形曝光机。 用电子束或接触方式制作亚微米半导体器件一般是很有效的。但是,以激光和X线为光源的电子束方式,曝光时间太长。接触方式制备掩模太困难,成品率也低,因此都具有局限性。而投影曝光方式曝光时间短,又由于光掩模不与片子直接接触,所以成品率大大提高。 加农公司的这种新的亚微米图形曝光机不仅可以用作超大规模集成电路,也为超高频晶体管、CCD(电荷耦合器件)等新器件的研制开拓了新的途径。     

Bi_(12)SiO_(24)晶体用于光并行逻辑运算时输出质量及写入灵敏度的分析

以 Bi_(12)SiO_(24)晶体制成的实时器件 BSO-PROM 可用于光并行逻辑运算。本文分析了影响其输出对比度、实际分辨率及写入灵敏度的因素;并给出了获得高对此度、高灵敏度应满足的条件。     

Optical parallel logic gates using a shadow-casting system for optical digital computing

A new, simple method of optically implementing optical parallel logic gates has been described. Optical parallel logic gates can be implemented by using a lensless shadow-casting system with a light-emitting diode (LED) array as a light source. Pattern logic, i.e., parallel logic for two binary patterns (variables), is simply obtained with these gates; this logic describes a complete set of logical operations on a large array of binary variables in parallel. Coding methods for input images are considered. Applications of the method for a parallel shift operation and optical digital image processing, processing of gray-level images, and parallel operations of addition and subtraction for two binary variables are presented. Comparison of the operation of the proposed optical logic gate with that of array logic in digital electronics leads to a design concept for an optical parallel array logic system available for optical parallel digital computing.     

Efficient reversible NOR gates and their mapping in optical computing domain

Reversible logic is a computing paradigm in which there is a one to one mapping between the input and the output vectors. Reversible logic gates are implemented in an optical domain as it provides high speed and low energy computations. In the existing literature there are two types of optical mapping of reversible logic gates: (i) based on a semiconductor optical amplifier (SOA) using a Mach–Zehnder interferometer (MZI) switch; (ii) based on linear optical quantum computation (LOQC) using linear optical quantum logic gates. In reversible computing, the NAND logic based reversible gates and design methodologies based on them are widely popular. The NOR logic based reversible gates and design methodologies based on them are still unexplored. In this work, we propose two NOR logic based n-input and n-output reversible gates one of which can be efficiently mapped in optical computing using the Mach–Zehnder interferometer (MZI) while the other one can be mapped efficiently in optical computing using the linear optical quantum gates. The proposed reversible NOR gates work as a corresponding NOR counterpart of NAND logic based Toffoli gates. The proposed optical reversible NOR logic gates can implement the reversible boolean logic functions with a reduced number of linear optical quantum logic gates or reduced optical cost and propagation delay compared to their implementation using existing optical reversible NAND gates. It is illustrated that an optical reversible gate library having both optical Toffoli gate and the proposed optical reversible NOR gate is superior compared to the library containing only the optical Toffoli gate: (i) in terms of number of linear optical quantum gates when implemented using linear optical quantum computing (LOQC), (ii) in terms of optical cost and delay when implemented using the Mach–Zehnder interferometer.     

基于(3+1)维光孤子驱动作用的光逻辑

给出了各维的空间孤子和时间孤子的概念 ;分析了孤子间可能的各种相互作用 ;根据光数字逻辑门的特性 ,(3+ 1)维光孤子驱动逻辑作用非常适用于数字光逻辑 ,这对于实现全光数字逻辑、高速全光数字通信具有重要意义。     

Reconfigurable All-Optical Logic Gates for Multi-Input Differential Phase-Shift Keying Signals: Design and Experiments

Differential phase-shift keying (DPSK) signals are promising candidate for the long-haul transmission systems. However, the development of the all-optical signal processing techniques for the DPSK signals is still in its infancy, especially the all-optical logic operations. In this work, a general scheme for reconfigurable logic gates for multi-input DPSK signals with integration possibility is proposed. Benefiting from the optical logic minterms developed by two kinds of optical devices, i.e., optical delay interferometers and semiconductor optical amplifiers (SOAs), target logic functions can be realized by combining specific minterms together. The scheme is reconfigured by changing the phase control of the delay interferometers or the input wavelengths. The latter approach was adopted in the experimental trials. Although the outputs of the scheme are on-off keying (OOK) signals, the data format is compatible with all-optical decision circuits where OOK format is preferred. Two- and three-input experiments are carried out at 20 Gbit/s with nonreturn-to-zero DPSK signals. Various logic operations are demonstrated, including full sets of two- and three-input minterms, AND, NOR, XOR, and XNOR logic operations where the AND and NOR logic are derived simultaneously and the XOR and XNOR logic are convertible. The optical SNR as well as the Q-factor of the two- and three-input results are measured and compared. It shows that the input powers to the SOAs are critical in achieving good extinction ratio and the Q-factor of logic results degrades when several minterms are combined. The recovery time of the SOAs need to be optimized as well. Finally, the scaling issues of the scheme are discussed.     

Wavelength selective optical logic and interconnects

A wavelength selective optical logic (WSOL) element that uses monolithically integrated wavelength selective optical input and output elements is described. Input optical signals are detected by photothyristors situated in an optical cavity which provides a highly selective response of a wavelength determined by the fabrication process. Output signals are generated by vertical cavity surface emitting lasers, whose lasing wavelengths can also be specified during the fabrication process. A vertical integration of these input and output elements that is suitable for wavelength selective optical logic and wavelength selective optical interconnect applications is proposed. The proposed circuitry is easily cascadable so that arbitrarily complex optical logic functions can be performed by WSOL devices in series. Several of the possible logic functions are described, including OR and AND gates, an adder, and a flip-flop     

Optical computing advances logically for image processing

A powerful application of optical computation, digital optical cellular image processing (DOCIP), is discussed. DOCIP uses digital optical computing techniques to perform cellular logic operations or extended array functions on images. Cellular logic is reviewed, and a binary image algebra (BlA) that serves as an analysis and synthesis tool for cellular image processing systems is described. Some DOCIP architectures that have been proposed or experimentally demonstrated are discussed and classified as image-algebra-type processors or symbolic-substitution-type processors. The optical and optoelectronic implementations of these architectures are also discussed     

先行进位光学并行多位全加器的研究

将二进制数的先行进位全加器的逻辑操作引入到光计算中,提出了用光学并行处理方法实现先行进位全加器逻辑操作的建议。信号以空间阵列方式编码,利用空间逻辑阵列,实现并行逻辑操作。研究了PD-LED的光电混合逻辑操作,利用PD—LED逻辑器件,从实验上验证了先行进位光学并行多位全加器,获得了满意的结果。     

Inverting and latching optical logic gates based on the integrationof vertical-cavity surface-emitting lasers and photothyristors

Inverting optical logic gates based on the monolithic integration of a vertical-cavity surface-emitting laser (VCSEL) with a heterojunction photothyristor (PNPN) are described. Logic functions INVERT, NAND, and NOR are experimentally demonstrated for the first time using latchable and cascadable PNPN/VCSEL switches, which can be triggered with very low optical energy, while producing high optical gain and optical contrast. These gates are integrable on a single epitaxial structure to provide multifunctional logic and memory arrays     

利用光纤参量放大器构成全光与门

利用光纤参量放大器(FOPA)中的波长转换特性完成全光与逻辑运算。以波长转换的原理为基础, 从两路输入光波的四种码字组合的相位匹配关系入手, 证明了FOPA的闲散光输出与两路输入光波的逻辑关系符合与门的逻辑。通过龙格-库塔方法数值求解非线性耦合方程组, 仿真证实了FOPA的输出与输入光波满足全光与门的逻辑, 研究了此全光与逻辑门闲散光波的输出功率随光纤长度、输入光波的功率比值以及输入光波波长位置的变化关系, 为实际中优化设计全光与门提供了参考。并对100 Gb/s的全光与逻辑运算中所应选择的输入光波脉冲宽度的问题进行了讨论。