低泄漏限幅器的研究

采用混合集成电路设计方法，用ＰＩＮ二极管和检波二极管，在很小的腔体内制作了小型化夫源微波限幅器。电参数为：频率ｆ＝２．５～３．０ＧＨｚ，插入损耗ＩＬ≤０．３９ｄＢ，电压驻波比ＶＳＷＲ≤１．３，漏功率Ｐｌｉｍ≤０．５５ｍＷ（输入连续波１Ｗ）。     

L波段砷化镓单片低噪声放大器

设计、研制了一种工作在Ｌ波段的ＧａＡｓ单片低噪声放大器。该放大器在ＨＰ－８５１０Ｂ网络分析仪和ＨＰ－８９７０Ｂ自动噪声仪上的测试结果为：１．１～１．５ＧＨＺ频段，ＮＦ≤２．０ｄＢ，Ｇ≥１８ｄＢ，ＶＳＷＲ（ｉｎ，ｏｕｔ）≤２：１，增益起伏≤０．５ｄＢ；在１．５～２．０ＧＨＺ频段ＮＦ≤２．５ｄＢ，Ｇ≥１８ｄＢ，ＶＳＷＲ（ｉｎ，ｏｕｔ）≤２：１，增益起伏≤±０．５ｄＢ。     

新颖应用电路·实用电路集ANP.571—574

新颖应用电路·实用电路集ＡＮＰ．５７１～５７４５７１．二极管模拟器在某些应用中，为了限制不必要的功率损耗，必须使用一只正向电压低于０．７Ｖ的二极管，可能是理想的。这里的这种电路就能实现这种理想。正向电流为１Ａ时，２个有源元件上的总压降仅为０．０４Ｖ，...     

数控衰减器研究

应用ＣＡＡ技术研究模拟了ＰＩＮ二极管的电参数特性，并用于数控衰减器的ＣＡＤ。频率范围：１．０～１．７ＧＨｚ，衰减范围：２，４，８，１６ｄＢ，插入损耗≤２．３ｄＢ，ＶＳＷＲ≤２．０。     

数控衰减器研究

应用ＣＡＡ技术研究模拟了ＰＩＮ二极管的电参数特性，并用于数控衰减器的ＣＡＤ，频率范围：１．０～１．７ＧＨｚ，衰减范围：２，４，８，１６ｄＢ，插入损耗≤２．３ｄＢ，ＶＳＷＲ≤２．０。     

激光二极管泵浦Nd：Sr5（PO4）3F小型绿色激光器

以激光二极管作为泵浦源，ＫＴＰ用作内腔倍频晶体，我们已从一种新型的Ｎｄ：Ｓｒ５（ＰＯ４）３Ｆ晶体中得到了０．５２９５μｍ的绿色激光输出，阈值功率为１０ｍＷ，当光学效率为１０．１％二极管激光输入射泵浦功率为４００ｍＷ，ＴＥＭ００模绿色激光输入功率为４０．４ｍＷ，给出了ＣＷ内腔倍频激光器的理论公式，并与试验结果一致。     

直流不可逆数字伺服系统功率转换电路的研究

１引言在现代伺服控制中，绝缘栅双极三极管（IGBT）作为一种新型的功率转换元件，与大功率晶体管（GTR）、场效应晶体管（MOSFET）等功率器件相比，以其具有的管压降较低、所需驱动功率小、工作频率范围较广（０．５kHz～３０kHz）、无二次击穿现象等特点得到了越来越广泛的应用。当应用于不可逆伺服控制系统时，考虑到成本和简化电路，而多采用单管IGBT方式实现。利用单管IGBT驱动电机的功率电路如图１所示。调宽波控制IGBT栅极以驱动高速电机；VD１为IGBT模块中集成的快速二极管；VD２为续流二极管，当IGBT关断时为高速…     

二极管端泵浦Nd：YAG连续激光器

我们研制了一台二极管连续端泵浦的Ｎｄ：ＹＡＧ激光器，用国产激光二极管作泵浦源，泵浦激光波长为０．８０８μｍ。激光介质为φ５×５ｍｍ的Ｎｄ：ＹＡＧ棒，输出激光波长为１．０６μｍ，用ＣＣＤ相机和图象处理系统记录和分析激光光斑，得到激光横模为ＴＥＭ００模，当输入谐振腔的泵浦功率为２２５ｍＷ时，输出连续激光功率最高达７６．４ｍＷ，光－光转移效率为３３．９％，电光斜效率达到９．１％，并做了腔外倍频实验。     

8～18GHz双刀双掷开关研究

采用混合集成电路的方法,用ＰＩＮ管芯制作了８～１８ＧＨｚ双刀双掷开关。开关采用管芯全并联结构。反射式ＤＰＤＴ开关插损≤２．０ｄＢ,隔离度＞５９ｄＢ,开态驻波比≤１．６５,承受功率为连续波５Ｗ。吸收式ＤＰＤＴ开关插损≤２．９ｄＢ,隔离度＞５８ｄＢ,开态与全关断态驻波比≤２．１,承受功率连续波２Ｗ。电路由ＴＴＬ信号控制。     

8￣18GHz双刀双掷开关研究

采用混合集成电路的方法,用ＰＩＮ管芯制作了８￣１８ＧＨｚ双刀双掷开关。开关采用管芯全并联结构。反射式ＤＰＤＴ开关插损≤２．０ｄＢ,隔离度〉５９ｄＢ,开态驻波比≤１．６５,承受功率为连续波５Ｗ。吸收式ＤＰＤＴ开关插损≤２．９ｄＢ,隔离度〉５８ｄＢ,开态与全关断态驻波比≤２．１,承受功率连续波２Ｗ。电路由ＴＴＬ信号控制。     

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.     

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.     

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.     

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.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

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.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.