最新刊期
卷 ， 期 5 ， 1995
- 摘要：PET-GP model has been set up which can be used directly for the analytical program in SPICE circuit. The result indicates:there are two kinds of way which can be adopted to use PETGP model. In this paper,the parameter βF and cut-off frequency fT of this model have been calculated by using the structure parameters of the devices studied. The calculating value of fT and its experimented result have a better agreement. The calculation of βF indicates that the carrier recombination at polysilicon/monosilicon emitter interface for the studied devices is very strong,and the value of recombination velocity Sp is up to 106cm/s.关键词：Polysilicon emitter transistor（PET）;Gummel-Poon model2|184|0更新时间：2025-12-08
- 摘要：The requirements of a general purpose neuro processor have been discussed. The advantages and disadvantages of all analog,all digital and digital-analog processing mode, used in general purpose neuro processors, have been studied. The structure of a digital-analog general purpose neuro processor has been developed. The performance/cost ratio of this general purpose neuro processor will be high.关键词：神经网络;数字模拟混合处理;处理机;大规模集成电路2|151|15更新时间：2025-12-08
- 摘要：A novel low latency and high throughput programmable tree architecture is proposed,which can efficiently implement both FSA and TSSA algorithms in motion estimation. In the proposed architecture ,the processing elements （PE） are reduced by 1/3 and the delay time of PE is decreased by a half compared to other architectures. Specific buffering structure （ME window） is employed to lower I/O bandwidth and decrease I/O pin count. Pipeline interleaving technique is employed to use the hardware 100%. Owing to these properties,the achitecture is very suitable for VLSI implementation.关键词：Video image code;motion estimation;motion compensation;block matching algorithm;Tree architecture2|42|5更新时间：2025-12-08
- 摘要：As a key field of electronic hi-tech,the efficient management and flexible addition of special real-time devices,whose type and model as well as quantity and quality are increasing day by day with a surprising speed,are essential functions indispensable to any computer-based special realtime system.The driver module for dedicated peripherals has thus become an unavoidable hard nut to crack in designing any special real-time system.In the paper we present the design and implementation of real-time device driver interactive generator which we have developed on our own.关键词：Special real-time parent system;Dedicated peripherals;Device drivers;Data model;Operation model2|22|0更新时间：2025-12-08
- 摘要：Object-oriented paradigm has been well-accepted in CAD and EDB,from which in turn many problems emerged.This paper proposed the term" dynamic object" to meet the requirements of mechanical CAD. A prototype DOC++ （C++ with Dynamic Objects） was implemented , and was used to model the evolution and abstraction of product models.关键词：Object oriented paradigm;Object;Dynamic object;Inheritance;C++2|35|4更新时间：2025-12-08
- 摘要：Based on numerical simulation, the nonlinear state equation of JAWS is linearized through linear approximation of phase differences at nodes. And then, analytical formulas describing the characteristics of voltage-state are derived from approximate state equation. The analytical description is in agreement very well with numerical simulation, and reveals clearly the dependences of isolation, fanout and oscillation on parameters of the gate. The oscillation on voltage-state results from the supercurrent in Josephson junctions,therefore,it may also exist in other superconducting logical gates composed of Josephson junctions,whose state is symbolised as voltage.关键词：Superconducting gate;Voltage-state;High frequency osillation2|19|0更新时间：2025-12-08
- 摘要：Travelling wave rate equations have been used to study the optical bistability of the two-segment laser diodes.Closed form solutions for photon flux inside the cavity have been deduced and some aspects of the bistable lasers discussed.关键词：Bistable semiconductor lasers;Photon flux;Carrier density2|45|1更新时间：2025-12-08
- 摘要：The transit times in the silicon microwave power transistors with the novel structure of N+IP emitter are regionally calculated by one-dimensional numerical simulation. The results indicate that its low current characteristics of the cut-off frequency fT can be obviously improved.关键词：Microwave power transistors;Transit time;simulation2|30|1更新时间：2025-12-08
- 摘要：A new technology for approaching Chinese character input is presented. It uses Chinese character structure database to replace input scan-table" Key pressing freedom"and"method selection Freedom" are given to users by using this new technology. In "Freedom" method, there are 3 ways to input characters: using stroke keys;using component keys; freely switching from stroke to component "Freedom method "includes" Full Freedom","Mini-Freedom" and "Super Freedom". They are suitable for people. both non-specialized and specialized.关键词：Chinese character processing;Input;Encoding.2|55|3更新时间：2025-12-08
- 摘要：The transimission of 780nm Rb Faraday resonance optical filter（Rb-FROF） is measured experimentally and analysed theoretically as a function of the density of atoms and the intensity of magnetic field.The experimental results show that the tuning capability of Rb-FROF by changing the magnetic field is about 100GHz/T,the coefficient of transmission more than 40%,the bandwidth 0. 001nm￣0. 01nm,and the rejection better than 10￣（-4）.关键词：Faraday rotation effect;Anomalous dispersion;Atomic optical filter2|84|3更新时间：2025-12-08
- 摘要：A normalized EDFA gain formula is derived by introducing a parameter Xi, describing the deviation of EDFA parameters from their stable values. The results show that using Xi as the criterion of systern singal-restoration characteristic is simple and practical.For terrestrial systems where EDFAs are less saturated, optical power can regain 90 percent of its original value within 3 stages when the system suffers a 3dB dip. System BER varies with perturbation location. A less saturated EDFA wousld result in a worse BER under perturbation ,and this should be seriouly considered in system design.关键词：Fiber optic communication;System performance;Signal-restoration;Erbium-doped fiber amplifier（EDFA）;BER2|33|1更新时间：2025-12-08
- 摘要：A comprehensive analysis of noise figure of Erbium-doped fiber amplifier（EDFA）has been carried out by including signal shot noise,amplified spantaneous emission （ASE） shot noise,as well as signal-ASE beat noise and ASE-ASE beat noise. Through numerical simulation, we can obtain some useful results under different input singal power and pump power level.We believe that these results will be a major advantage in determining the EDFA’s operation condition and design.关键词：fiber communication;Erbium-doped fiber amplifier;noise figure2|619|14更新时间：2025-12-08
- 摘要：A united control variable which represents the interaction between routing and flow control algorihtms in computer networks is defined. The perturbation formulae of the routing controller and flow controller are obtained. Under various load conditions and perturbation environment,the performance sensitivity estimation in computer networks is studied.关键词：Perturbation analysis;performance evaluation;computer network;Routing decision;Flow control.2|31|0更新时间：2025-12-08
- 摘要：The problem solving ability of ANN is discussed in this paper, problem of capacity,generalization and learning is studied from wide view of point. the computational complexity of ANN learning is discussed in deep. Difficulties in solving practical problems by ANN is also pointed out.关键词：neural network;computational complexity;Learning3|607|145更新时间：2025-12-08
- 摘要：A novel research field of photoelectric conversion has been opened up by LangmuirBlodgett technique. In this paper, the progress of this field is briefly reviewed. The developmental and applied perspective is discussed,some suggestions are also put forward.关键词：Langmuir-Blodgett;Phthalocyanine;Photoelectric conversion;Light generated current;Photoelectric device2|131|6更新时间：2025-12-08
- 摘要：两端线网布局的遗传算法蔡煜东（中国科学院上海冶金所，上海２０００５０）１．遗传算法１９７５年，Ｈｏｌｌａｎｄ受生物学中＂生物进化＂和＂自然选择＂学说的启发，提出了著名的遗传算法，经过近２０年的研究、应用，遗传算法已成为非线性优化和系统辨识的有效工具，...2|34|2更新时间：2025-12-08
- 摘要：The effect of implantation dose, implantation methods （Single implantation,Sequential implantation）on characteristics and structures have been described by techniques of RBS and TEM. Especially the transition region of Si/SiO2 interface is emphatically studied. The results show that the sequentical implantation and annealing（compared with single implantation in the same implantation dose）can not only evidently improve the quality of top layer and buried layer of SIMOX,but also evidently reduce the width of Si/SiO2 interface transition region.关键词：Oxygen implantation;SOI;Single implantation;Sequential implantation2|40|1更新时间：2025-12-08
- 摘要：We report a-Si:H thin films prepared by layer-by-layer deposition. The influences of deposition rate,sublayer thickness and H-plasma treatment of film properties were studied. Our results indicate that H-plasma treatment can induce the samples changing from amorphous to microcrystalline phase ,and also shift the Fermi energy level upwards or downwards,depending on the deposition and H-plasma treatment conditions.a-Si: H with higher photosensitivity and stability can be obtained under lower deposrtion rate and smaller sublayer thickness combining with suitable H-plasma treatment.关键词：a-Si:H;H-plasma treatment;stability2|31|0更新时间：2025-12-08
- 摘要：Effect of external optical feedback on strongly coupled external cavity semiconductor laser is theoretically analyzed for both coherent and incoherent external optical feedback. The results show that the critical tolerable level of external optical feedback can be greatly increased by about 20dB for strongly coupled external cavity semiconductor laser compared to solitary laser diode.It is also obtained that long external cavity length and strong external cavity coupling are beneficial to resist feedback for external cavity semiconductor lasers.关键词：Semiconductor laser;Optical feedback2|153|5更新时间：2025-12-08
- 摘要：Based on the rate equation theory of Erbium-doped fiber amplifier, the relationships between parameters of Erbium-doped fibers and gain characteristics of EDFA are analysed and calculated.The analytic expressions for cutoff wavelengths of the Er fiber are obtained for the first time.关键词：Erbium-doped fiber amplifier（EDFA）;Rate equations;gain2|174|2更新时间：2025-12-08
- 摘要：A modified formula for the locking bandwidth in an injection-locked semiconductor laser is presented by consideration of the influence of nonlinear gain. The lower limit of the frequency detuning for the laser stably operating will be reduced by this influence, especially for a laser with large bias current or with large nonlinear gain coefficient.关键词：Semiconductor laser;Injection locking;Locking bandwidth;Nonlinear gain2|101|5更新时间：2025-12-08
- 摘要：Based on the new nondestuctive method-Continuous Wave Electro-Optic Probing （CWEOP）,we detected the electric field distribution for GaAs/AlGaAs LD,LD array and LED array.The features of the electric field, injected current distribution in different layer and the optic homogeneous for arrays are presented.关键词：LD;LD array;LED array;Electronic field distribution;CWEOP2|32|1更新时间：2025-12-08
- 摘要：A three-layer mechanical model is presented for a quartz crystal humidity sensor and a formula is deduced for calculating the relationship between surface sorption and frequency shift of a coated quartz crystal resonator. Experiments have proved that this formula is more identical with experimental results than G. Sauerbrey’s formula, and it can also be applied to other quartz crystal gas or ion sensors.关键词：Quartz crystal resonator;Physical sorption;Surface coating;Shear acoustic wave2|107|6更新时间：2025-12-08
- 摘要：A CCII-based fully integrated universal MOSFET-C continuous-time filter is proposed.The proposed circuit can realize generic transfer functions such as lowpass,bandpass, highpass,band rejection and allpass.It achieves MOS non-linearity cancellation and does not require the use of fully balanced structure. The paseband sensitivity is rather low.关键词：current-mode;Integrated filter;circuit implementation2|46|1更新时间：2025-12-08
- 摘要：This paper describes a boundary element formation together with the moment method analysis, which is used to calculate the equivalent resistance among multiport for packaging structure consisting of uniform conducting plane with arbitrarily shaped boundaries.关键词：Boundary element;moment method;Multiport;Interior apertures and exterior boundary2|35|2更新时间：2025-12-08
- 摘要：The structure and performance of the external pressurizing capillary ultrafiltration modules are described and compared with internal pressurizing capillary ultrafiltration modules. The colloidal silica ,bacteria and endotoxin with diameter greater than 70 can be removed completely by the external pressurizing capillary UF modules ,which can meet the requirement of VLSI,therefore,they are excellent to by used as a final step in the polishing system.关键词：Ultra-pure water;External pressurizing ultrafiltration;VLSI2|39|1更新时间：2025-12-08
- 摘要：The characteristic of annealed proton-exchanged optical waveguides in LiNbO3 was reported. The refactive-index profile before and after annealing was calculated with IWKB method.We found that a generalized Gaussian function is suitable to the IWKB refractive-index profile.It was found in experiments that the modes disappear when annealed under higher temperature for longer time.关键词：Proton exchange;Anneal;Generalized Gaussian function2|79|9更新时间：2025-12-08
- 摘要：A 3-D non-uniform Finite-Different Time Domain method is proposed to characterize either air bridges or holes in MMIC. Numerical results show that the new method reduces a lot of CPU time and has high accuracy.关键词：Time domain;MMIC;Air bridge;Holes;Nonuniform grid2|42|1更新时间：2025-12-08
- 摘要：An oxygen sensitive YSZ-Gate MOSFET is new type oxygen sensor, The sensor is fabricated by depositing a thin layer of YSZ（Yttria-Stabilized Zirconia）on a gate insulator of FET.The response mechanism of the sensor is introduced and the influence of crystal structure of YSZ solid electrolyte on its electrical conductivity is discussed.The results of microanalysis and the rapid response with time are also given.关键词：Oxygen sensitive sensor;Solid electrolyte;Electrical conductivity2|35|1更新时间：2025-12-08
- 摘要：半导体导电陶瓷的研究薄占满（天津大学材料科学与工程系，天津３０００７２）ＳｎＯ＿２制成的导电陶瓷能否耐强酸腐蚀，至今尚未见报导，且ＳｎＯ２熔点很高，难以烧结成瓷，本文对烧结温度低的半导体导电陶瓷及其耐酸能力进行了研究。采用试剂纯ＺｎＯ，ＣｕＯ作为加入...2|208|2更新时间：2025-12-08
- Technical support is provided by Beijing Founder electronics co., LTD 京ICP备09064830号-19
京公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
0