一种电流放大型自旋晶体管

该文提出了一种电流放大型自旋晶体管设计思想，并对其电流放大系数作了一定的分析讨论．自旋晶体管中的电流放大系数主要取决于注入基区的自旋极化电子的极化程度，基区中自旋的驰豫时间及基区的宽度．     

基于晶体管电流源的1比特DAC设计

提出了一种基于晶体管电流源的1比特DAC电路设计,电路由晶体管、电阻等分立器件构成,电路前端是FPGA将数字信息‘1’和‘0’编码为4路TTL电压脉冲,4路TTL电压脉冲分别控制4路晶体管电流源,然后将输出叠加为"阶梯"余弦信号,最后经过低通滤波得到适合基带传输的模拟信号,电路在ADS软件中仿真验证.     

硅低温双极型晶体管电流增益的分析

从理论和实验两方面研究了硅晶体管电流增益的低温特性,建立了电流增益的温度模型,阐明了电流增益低温下降的机理,在此基础上探讨了获得具有良好电性能的硅低温晶体管的方法,结论如下:电流增益由发射效率决定时,具有正温度系数,且随温度下降而下降,下降程度随工作电流的减小而增强.发射区采用轻掺杂技术以减小禁带变窄量,并考虑载流子冻析效应,可获得适于低温工作的硅双极晶体管.     

石墨烯晶体管研究进展

针对集成电路的特征尺寸小于10nm以下所面临的短沟道效应、隧道效应和制造工艺限制困难引发的研究热点——石墨烯能否替代硅,着重从数字晶体管、射频晶体管和柔性透明晶体管3个方面概括和分析了新型石墨烯晶体管的发展现状。分析认为:石墨烯平行纳米带阵列结构和异质结结构有望打开石墨烯禁带以实现大的电流开关比,将是石墨烯数字晶体管的研究热点;通过降低接触电阻、接入电阻以及衬底、栅介质的匹配来提高截止频率和最大振荡频率将是石墨烯射频晶体管的主要发展趋势;基于聚对苯二甲酸乙二醇酯(PET)衬底和离子凝胶栅介质的柔性制造技术,最有希望在保证石墨烯高迁移率的基础之上实现全石墨烯透明柔性电路,使石墨烯晶体管得以实用,必将对集成电路行业产生巨大影响。     

晶体管反向传输现象的讨论及应用

本分析了晶体管在发射结加正向偏置电压而集电极回路加入脉冲信号时有关电压、电流的波形特点及其物理解释．由此，提出了一种鉴别晶体管高频特性的方法，并解释了黑白电视机的一种故障现象，纠正了献[4]、[5]的错误。     

改善高频大功率晶体管二次击穿提高fT的特殊设计方法

本文主要讨论改善高频大功率晶体管正偏（电流集中型）二次击穿并以３ＤＡ１５０、３ＣＡ１５０型高频大功率晶体管为例，介绍一种特殊的版图设计方法，使发射结面积得到充分利用，有效地提高了电流容量，消除了大电流时发射极电流集边效应，改善了电流集中型二次击穿，减慢了大电流时β０的衰减程度，从而相应地提高了特征频率ｆＴ。     

多晶硅发射极晶体管的数值分析及模拟

通过对多晶硅发射极晶体管（ＰＥＴ）的多晶硅及界面层导电特性的分析， 得到单晶发射区边界上电流密度与少子浓度之间的关系式，并以此为自洽的 边界条件，在单晶区数值求解一组描述晶体管电学特性的微分方程，得到晶 体管内部电势分布和载流子分布以及ＰＥＴ的端电流特性．     

超低hFE温度系数晶体管研制

采用poly-Si(n )/UTSiO2/n -Si/P-Si发射结构，研制出参数与常规晶体管相近，能长期稳定工作，在－55－100度温度范围内，hFE温度系数小于20％的硅晶体管。     

功率晶体管背面金属化研究

本文对比研究了磁控溅财、化学镀镍和蒸发等不同方法制备的背面金属化层对功率晶体管性能的影响。结果表明，采用磁控溅射方法制备的银系多层金属电极能显著降低功率晶体管的热阻，减小饱和压降和改善在电流特性。特别是，间隙工作寿命试验超过38000次以上，达到高可靠质量要求。文中还研究了金属化层制备中芯片背面状况对晶体管性能的影响。     

改进型大功率晶体管自保护驱动器

本文在分析大功率晶体管过电流保护技术的基础上,提出一种新型大功率晶体管自保护驱动器。它在功率晶体管直通和输出短路情况下,自行关断晶体管,没有保护死区,实现了可靠的过流快速保护     

低温双极晶体管的低温1／f噪声

对自行研制的低温晶体管于液氮温度下进行了低频噪声测量，结果表明：与室温相比１／ｆ噪声显著增大，根据１／ｆ噪声理论，并参照器件室温和低温下ＩＢ－ＶＢＥ曲线的不同，认为在低温下ＥＢ结正向压降增大和载流子的冻折效应是使该器件１／ｆ噪声等效输入电流功率谱密度变大的主要原因。     

用双电流法测量双极晶体管的结温

基于Shockley 方程提出用双电流法测量半导体器件的结温,并与传统的线性近似法进行对比,消除了由于不同器件热电性能的差异引入的误差,提高了结温测量精度     

物理法造型在NPN晶体三极管模型建立的应用

该文介绍器件物理法造型的基本步骤和方法,指出在建立NPN晶体三极管造型的过程中,如何选取物理变量,建立和简化模型方程,最终得出NPN晶体三极管的直流模型和直流伴随模型。     

双极晶体管结温分布均匀性的一种判定方法

分析了当双极晶体管结温分布不均匀时用ΔＶＢＥ法测得的温度与器件结温分布以及测量条件的关系,提出了一种快速判断双极晶体管结温分布均匀性的方法．     

低温下晶体管击穿电压的温度特性与分析

本文给出了从２００Ｋ到１０Ｋ低温下，硅双极晶体管击穿电压随温度而变化的实验结果，建立了理论模型，并对实验结果作出合理解释     

低能量Ar~+背面轰击对晶体管电流放大系数和特征频率的影响

在制造硅ｎｐｎ型高频、超高频小功率晶体管管芯和形成铝电极后，用低能量氩离子束进行背面轰击，能显著增大晶体管的直、交流电流放大系数，提高特征频率和使击穿特性变硬。实验结果表明，上述参数的改善，是轰击后界面态密度减小和基区少数载流子寿命增长的结果，而且与轰击时间及束流密度有关。     

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.     

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.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.