最新刊期
卷 ， 期 11 ， 1994
- 摘要：From the practical requirements of new astronomical photoelectronic imaging detectors,much attention has been paid to the design of new permanent magnet focusing field systems,in which curved input-image and demagnification are allowable.The constrained inverse design of the focusing magnetic field in electrostatic and magnetic imaging systems applying new permanent magnet materials is discussed and investigated using the constrained optimization CVM （Constrained Variable Metric） method.关键词：electron optics;image intensifier;Image detector for space astronomy;Permanent magnet focusing;Electron optics system CAD2|38|1更新时间：2025-12-08
- 摘要：This paper reported a novel bulk acoustic wave （BAW） microresonator structure based on piezoelectric thin films and polysilicon membrane. In contrast with conventional BAW composite resonators based on Si membrane,the poly-Si mambrane is fabricated with surface micromachining technology. The process is a completely planar approach and the double-side lithography and back-side etch are deleted. The c-axis oriented piezoelectric thin film ZnO is grown on poly-Si membrane by S-gun magnetron reactive sputtering.The size of a microresonator is less than 250×250μm2 and the resonant frequency is about 560MHz.关键词：Bulk acoustic wave devices;Piezoelectric thin films;Silicon surface micromachine3|61|7更新时间：2025-12-08
- 摘要：An improved surface acoustic wave （SAW）/diode convolver is presented.It makes use of a SAW tapped delay line and the nonlinearity of an attached array of backward biased diodes.The harmonics of input signals and the influence between the taps can be suppressed well in the new structure.It possesses the advantages of real-time processing,simple structure and high efficiency.The analysis of the convolver and the experimental results of a device with 28 taps are also given.关键词：surface acoustic wave;Convolver2|41|1更新时间：2025-12-08
- 摘要：A new high-efficiency microstrip photoconductor switch ultrashort electric pulse generator is presented in this paper. The effect of photoconductor switch on instantaneous property of output electric pulse is discussed in theory. The experimental results are given.关键词：Ultrashort electric pulse generator;Microstrip circuit;Photoconductor switch2|91|16更新时间：2025-12-08
- 摘要：There is a relationship between LCC（Life Cycle Cost）and R（Reliability）in an electronic product or a complex electronic system.At present,most of the researchers focus their attention on the static relationship at home and abroad. This paper,based on the consideration of the varying reliability with time and the time value of capital,presents a dynamic model and makes simulation analysis.关键词：LCC;reliability;dynamic model;Simulation analysis2|178|7更新时间：2025-12-08
- 摘要：With rapid increasing of the speed of CPU and the mismatch between CPU and I/O,the bottleneck phenomenon of the computer system with high performance becomes even more serious day by day. Disk array technique is a new and bright way to solve this problem. This paper discusses and analyzes the system reliability of RAID that has been paid the most close attention to,so as to establish a justified evaluating system.关键词：计算机I／O瓶颈;磁盘阵列;冗余结构;容错;系统可靠性2|79|5更新时间：2025-12-08
- 摘要：The reliabilrty of 62Sn-36Pb-2Ag surface mount solder joints has been analyzed by means of thermal fatigue tests.Meanwhile,the effect of different plated process for components and substrate on reliability is discussed,and the evolution of thermal fatigue dislocation substrucure and failure mechanism of solder joints have been studied tentatively. The results show that:intermetallic compounds influence the reliability of solder joints significantly,for solder joints of components and substrate plated with Au ,the thermal fatigue cracks initate and propagate in AuSn4 intermetallic compounds ;on the other hand, solder joints plated with Ni/Au ,cracks initiate at the AuSn4/β-Sn interface. TEM observation finds out that there is high density dislocation in β-Sn phase after crack initiation.关键词：solder joints;reliability;Intermetallic compound;Thermal fatigue;Dislocation;Crack2|147|7更新时间：2025-12-08
- 摘要：C-V,I-V,interface,charge density and breakdown characteristics of MLS stucture are deeply studied in terms of device physics in this paper,and a new type of MLS structure field effect transistor with high electrical performance is developed.The experimental results of MLSFET fit well with the theoretical analysis.关键词：LB insulation films;MLS structure;transistor2|24|0更新时间：2025-12-08
- 摘要：The nonlinear characteristics of the 90°bridge coupler power amplifier/combiner are thoroughly analyzed after the dynamic equations at large signal are derived. The formulation of gain at small signal is obtained.The effect of the parameters of each amplifier on the combining results is discussed. Experiments at Ka band are in accordance with the theory very well.关键词：鉨ridge coupler;Vonlinear analysis power;Amplifier/combiner2|119|1更新时间：2025-12-08
- 摘要：This paper presents a digital circuit high-level synthesizer DCS. The synthesis of data path and the implementation of control sequene in DCS are mainly discussed in the following subproblems:the allocation of operators, the allocation of interconnection units,the synthesis of control circuits and the implementation of circuit at gate level.The clique algorithm is used in the allocation of operators, the rule-based method is used in the allocation of interconnection units, and the counterbased method is used to implement the synthesis of comtroller.关键词：High-level synthesis;Data path;controller;logic simulation2|45|3更新时间：2025-12-08
- 摘要：With TLU-based FPGA becoming more and more popular,various specific logic mapping algorithms have emerged for either area optimization or delay optimization. But until now there is no good logic mapping solution for the trade-off between area consideration and delay consideration. In this paper,we present an improved algorithm for above problem,which also adopts a novel heuristic algorithm to partition the DAG into single-output sub-DAGs.关键词：FPGA;TLU;Logic mapping;performance2|85|3更新时间：2025-12-08
- 摘要：The paper presents a new gate matrix layout system:GMS for VLSI CMOS circuits.GMS can be used as a cell generator to produce basic cells automatically.The whole layout procedures in GMS are divided into gate assignment ,net assignment and compaction. Based on the consideration of many practical constraints,GMS uses a new gate assignment algorithm which can improve Li’s algorithm[6] a lot.GMS also transfers net assignment into an extended l-dimensional assignment problem,and a heuristic algorithm is developed. GMS allows users to do interactive improvement on the layout results.It compacts the layout results to further reduce the used area.GMS has been implemented in C language on Micro VaxII.Many practical examples are tested and the experimental results are promising.关键词：Cell generation;Gate matrix.2|23|0更新时间：2025-12-08
- 摘要：The paper introduces the multimedia techniques on computer and communication,the development of multimedia techniques, the status and typical products of the multimedia computer,and the key techniques and trend of the multimedia computer and communication.From this we can see that the multimedia techniques are inexorable trend of nowaday information science and technology development.A brand-new idea inevitably brings a revolution to computer and information processing area with the research of multimedia techniques and provides more convenient tools of information communication to human society.关键词：multimedia;computer communication;data compression;database2|141|2更新时间：2025-12-08
- 摘要：Direct electro-optic sampling is a very powerful technique for characterizing high speed GaAs integrated circuits on wafer,An electro-optic sampling system using semiconductor lasers has been set up. It has been used to test 43.7 ps fuli width at half maximum electric pulses generated by a comb generator,SGHz microwave signaIs, phase shift or time delay of 3GHz microwave signals and static curve of microwave ferrite phase shifter. This system will be applied to the on-wafer tests of dynamic characters of high speed GaAs integrated circuits.关键词：Electro-optic sampling;High speed integrated circuit;On-wafer test;Semiconductor laser;microwave2|41|0更新时间：2025-12-08
- 摘要：TiSi2 technology formed by two step rapid thermal annealing and its compability with other technology,and TiSi2 physical and chemical characteristics have been investigated.Combining to LDD, submicron CMOS Ti-Silicide technology formed by two step RTA,which can improve ICs characteristics,has been used for ICs fabrication.关键词：IC technology;IC fabrication;Thin film2|69|1更新时间：2025-12-08
- 摘要：通过对Ｂｉ代石榴石膜的成核、晶体生长速率和法拉第效应的分析，给出最大成核温度范围（６３０℃～６８０℃）和细化晶粒的途径，膜的磁光性能、结构和成份测试结果与理论分析一致。关键词：晶化;磁光;石榴石2|41|8更新时间：2025-12-08
- 摘要：The paper proposes a five-input adder module with dual carry-out ,which can process more information. As examples,a nine-input adder and a serial carry-propagation adder for three multi-bit numbers are designed.It is shown that the number of adder module can be reduced in the design of arithmetic operation circuits with the module.关键词：Logic design;adder2|79|0更新时间：2025-12-08
- 摘要：A low noise, low offset voltage,high CMRR and PSRR CMOS operatiorial amplifier is presented.The tested input noise voltage is less then 2.5μV peak to peak..The input offset is less than lmV for supply voltage from±2.5V￣±10V experimental and expected results are in good agreement.关键词：CMOS;low noise;amplifier2|206|1更新时间：2025-12-08
- 摘要：Based on the extended physical optics approximation,we obtain the Fourier diffraction theorem for a perfectly conducting object,which is quite similar to the one for a dielectic object derived under the Born or Rytov approximation. This identity relates the object characteristic function with the scattered fields over a measurement plane in Fourier domain.Therefore,it can be used to reconstruct a perfectly conducting target from the scattered dara. The availability of the itientity is exemplified by a circular cylinder case.关键词：Perfectly conducting object;Extended physical optics approximation;Fourier diffraction theorem;reconstruction2|38|0更新时间：2025-12-08
- 摘要：A complete model of PIN-PD is presented in this paper.This model can be used to develop OEIC CAA program for DC,AC and transient analysis.The results from this model for an InGaAs/InP PIN-PD agree well with the reports.关键词：PIN-PD;Model;CAA2|992|15更新时间：2025-12-08
- 摘要：引入了网络矩阵Ｈ的一般ｋ阶余因式的对应ｋ阶缩减图，应用它导出了一般ｋ阶余因式Ｈ的ｋ阶１因子表达式，该表达式简单、实用。关键词：k阶余因式;k阶缩减图;k阶1因子2|20|1更新时间：2025-12-08
- 摘要：The order of complexity and stability of linear time-invariant active networks is studied by means of tha concept of decoupling zeros in polynomial metrix theory,and the network（or system）matrix P（s）is obtained hased on the fundamental loop metrix, fundamental cutset matrix and branch V-I relation matrix.Compared with Reference （3）, the order of network matrix is lower,the elementary row operation becomes easier and the complexity is studied,too.关键词：polynomial matrix;decoupling zero;complexity;stability.2|285|3更新时间：2025-12-08
- 摘要：In this paper,a probability space is introduced to describe IC yield optimization problem,and the probability measure of the feasible region is employed to indicate the yield The weighted Monte Carlo method is snitable in the early optimizzation stage,while the improved SA algorithm is more efficient in the final stage.Using these methods,the yield optimization system for integrated circuits （YOSIC）works very well.关键词：IC Statistical optimization;IC yield;IC CAD2|53|3更新时间：2025-12-08
- 摘要：一种双二次型电流有源滤波电路ＡｎＡｃｔｉｖｅＦｉｌｔｅｒＣｉｒｃｕｉｔｏｆＣｕｒｒｅｎｔＴｙｐｅｆｏｒＢｉｑｕａｄｒａｔｉｃＦｕｎｃｔｉｏｎ刘彦民，袁石文立木纯夫，副井裕（东北重型机械学院）（日本国立岛取大学）近年来在电流型有源滤波器的研究中，一些文...2|124|4更新时间：2025-12-08
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