MOS反型层和多晶硅栅量子效应的解析模型

在超深亚微米MOS器件中,量子效应对器件特性的影响很大.根据改进后的三角势场近似和曲线拟合,同时对MOS器件反型层和多晶硅栅中电子的量子效应进行了建模,得到了一个基于物理的解析模型,利用该模型计算MOS器件的阈值电压,与数值模拟的结果比较表明,模型的精度令人满意.     

具有双n+发射区的MCT

提出一种新型的MOS控制晶闸管结构DNMCT器件。该器件同MCT相比减弱了寄生JFET效应，并利用PISCES-IIB器件模拟软件验证DNMCT具有较好的正向导通电流-电压特性。该结构在一定程度上可缓解器件开关速度与导通压降之间的矛盾。     

具有误差修正的神经元MOS数模转换器

基于神经元MOS (νMOS)加权运算的功能设计一种结构简单的新型数模转换器.该转换器通过附加电路来修正MOS管阈值电压、减小积分非线性和微分非线性以及输入栅电容精度工艺偏差等影响,使输出误差限定在 0.5LSB以内.在转换时间分别为100ns、50ns两种情况下, 采用Charted 0.35μm工艺、用 Candence spectre工具对其动态特性进行了模拟研究,结果表明:在转换时间为100ns的输出误差均在 0.5LSB以内.     

双极晶体管导通状态对功率纵向双扩散MOSFET静态电流—电压特性的影响

通过对DVMOS结构器件测量的I-V特性和模拟结果的分析，发现在此结构中，寄生的双极管对器件性能具有不良影响，可以来用一种新型的具有浅扩散p^ 区的自对准VDMOS结构，以完全消除寄生的BJT导通机制，这对MOS技术的发展十分有益。     

具有双n+发射区的MCT

提出一种新型的MOS控制晶闸管结构DNMCT器件。该器件同MCT相比减弱了寄生JFET效应,并利用PISCES-IIB器件模拟软件验证DNMCT具有较好的正向导通电流-电压特性。该结构在一定程度上可缓解器件开关速度与导通压降之间的矛盾。     

功率集成光激MOS控制交流多路开关模拟设计

介绍了一种新型功率集成光激MOS控制多路开关，它由双向晶闸管，MOS器件，光电器件组成。此开关通过光电转换来实现强电与弱电之间的隔离，可工作在交流状态，其通态压降低，约在1．5－3V之间，并对其阻断特性，电流特性，开关特性进行了全面的模糊分析，此开关适用于开发各种电源开关产品。     

基于R-MOSFET-C的低通滤波器的设计

利用R-MOSFET-C器件和CMOS全平衡结构运算放大器设计一个截止频率为500 kHz的四阶巴特沃斯(Butterworth)低通滤波器,该滤波器由工作在线性区的MOS管来做为压控电阻,从而代替一般有源RC滤波器中无源电阻R,通过调节栅极电压大小来改变其等效电阻,达到滤波器截止频率的精确可调.     

高温6H-SiC CMOS运算放大器的设计

目的设计可工作在高温下的6H-SiC CMOS运算放大器。方法该电路基于标准的PMOS输入两级运放而成,考虑泄漏电流匹配添加Dcomp二极管。利用零温度系数理论和泄漏电流匹配的原则对电路管子的尺寸进行确定。通过求解SiMOS管和6H-SiC MOS管零温度系数点来稳定偏置电路。结果利用Hspice进行仿真,当温度从300K变化到600K时,SiC运放的增益和相位裕度的变化率分别为2.5%和3.3%,而Si电路的增益从300K的64dB降到600K的-80dB。由于SiC MOS器件沟道迁移率低导致器件的跨导低于相同尺寸下的Si器件,所以其开环增益也小于相同结构和尺寸的Si OPAMP。结论此电路可以在高温下稳定工作,但是单管的性能较Si单管差。     

EWB仿真运算放大器混沌电路

运算放大器自身的限幅特性是典型的非线性特性,使得非线性或分段线性器件无须特意构造,简化了电路设计。本文分析一种限幅运算放大器混沌电路结构及其电路方程,仿真该电路的混沌相图与混沌演变。     

硅双栅MOS场效应晶体管的模型和实验特性

硅双栅MOS场效应晶体管或称MOS场效应四级管(简写为DG—MOSFET′S),是一种超高频、低噪声、增益可控的新型固体电子器件。本文是根据电流连续性原理系统的推证了该器件的物理模型及实验特性。其结果通过电子计算机所计算出的工作曲线与实测都基本与Brown和Barsan等人的一致。故本文认为这是一种比单栅MOS场效应晶体管(简写为SG—MOSFET′S)性能好,应用更加广泛的MOSFET器件。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the