Si微电容式加速度计动态参数的提取

介绍了一种电容式微Si加速度计的基本结构以及静电激振法用于电容加速度计动态参数测试的基本原理。提出了在开环条件下,采用静电激振法对该类型电容加速度计动态参数测试的电路方案。通过分析获得了扫频特性曲线和阶跃响应曲线,得到了传感器的固有频率、阻尼比。试验结果表明,采用静电激振法得到的结果与传感器设计值比较接近。可以认为,开发的动态参数测试系统是快速且有效的。     

铝电解电容器阴极箔的后处理和稳定化处理

研究硝酸后处理对阴极箔比容的影响和稳定化处理形成氧化膜的机理。硝酸浓度和温度低 ,侵蚀箔稳定化处理后氧化膜不稳定 ,容量衰减快。浓度和温度高 ,侵蚀箔容量损失大 ,侵蚀箔的初始比容低。加入硫脲和六偏磷酸钠可提高铝箔的初始比容。磷酸和钼酸钠迭加处理使侵蚀箔获得高的初始比容和低的容量衰减率 ,磷酸处理形成氧化膜可分为 Al PO4结构的表面层及 Al PO4和部分 Al被 P代替的水合氧化铝的过渡层。钼酸钠处理形成的氧化膜可分为 Al2 (Mo O4) 3结构的表面层及 A12 (Mo O4) 3和部分 Al被 Mo代替的水合氧化铝过渡层     

用于液体违禁品检测的电容传感器设计

提出了利用液体介电常数的电子测量,实现一种快速、无辐射、非接触、低成本的液体违禁品探测的新方法。在研究了液体介电常数测量的理论,并结合具体应用场合的基础上,提出了基于平面板电容器原理的平面板电容传感器和改进型的梳妆电容传感器电极,从理论的角度上对电极的参数进行了探讨。通过实验证明了改进型的梳状电极能够在不开瓶取样的情况下,有效鉴别出在厚度为4mm以下的非金属容器中浓度50%以上的酒精和水,可以用于非接触式液体违禁品快速检测。     

一种具有预驱动电路的低抖动LVDS驱动器

传统LVDS驱动器由于电源不稳定、驱动器与传输线之间阻抗不匹配等不良因素的影响,输出波形会出现抖动,质量下降.在传统LVDS驱动器的基础上,设计了一种新颖的LVDS驱动电路.该电路采用预驱动技术,控制输出电压的翻转和减少总输入电容,输出波形较为平滑.采用0.18μm工艺对电路进行仿真.结果显示,电路输出波形摆幅为0.345 V,输出共模电压为1.17V,总输入电容为72 fF.     

谐波条件下电容式电压互感器测量影响因素分析

随着现代电网的不断发展,电网系统中的非线性负荷等数量不断增加,谐波问题成为影响电网电能传输质量的关键因素,本文对谐波条件下,影响电容式电压互感器测量的因素进行了分析研究,希望可以对在谐波条件下电容式电压互感器测量技术的发展有所帮助.     

大电流密度下欧姆接触退化机理的研究

对大电流密度下欧姆接触的结构进行了改进,采用只对接触区域老化而其它区域非破坏性的结构特点,保证测量数据的真实有效性。工艺制备中采取多次SiO2铺垫多次光刻技术解决了引线电极断裂的可能。通过施加达到或超过105A/cm2电流密度,利用文中结构测得比接触电阻早期快速失效,且随电流密度增加退化加剧,对样品老化前后进行能谱分析得知,大电流密度下接触层中Al离子发生了扩散从而破坏了良好接触。     

一种电子元器件的简易测量方法

针对电子元件的测量问题,提出了一种简易测量方法。采用555多谐振荡电路,通过C8051F060单片机控制测量电阻、电容对应振荡电路所产生的频率实现各个参数的测量,一方面测量精度较高,另一方面便于使仪表实现自动化,并可语音播报使其更加智能化。应用结果表明:该测量方法所用元器件少、电路简单,误差在±5%以内,满足实际测量要求。     

脉冲电阻分压器的性能分析和电感补偿

在自动检测领域,高压窄脉冲的测量是非常重要的,脉冲分压器结合AD采集卡是常用的测量系统的主要组成部分.电阻分压器因其结构简单、性能优良、使用方便等特性而具有广泛的应用.本文讨论了电阻元件杂散电容对脉冲电阻分压器性能的影响,引入传递函数的概念对其进行理论分析,提出了电感补偿的方法.实验结论和理论计算结果一致,验证了电感补偿的可行性.     

DC and analog/RF performance optimisation of source pocket dual work function TFET

We investigate a systematic study of source pocket tunnel field-effect transistor (SP TFET) with dual work function of single gate material by using uniform and Gaussian doping profile in the drain region for ultra-low power high frequency high speed applications. For this, a n⁺ doped region is created near the source/channel junction to decrease the depletion width results in improvement of ON-state current. However, the dual work function of the double gate is used for enhancement of the device performance in terms of DC and analog/RF parameters. Further, to improve the high frequency performance of the device, Gaussian doping profile is considered in the drain region with different characteristic lengths which decreases the gate to drain capacitance and leads to drastic improvement in analog/RF figures of merit. Furthermore, the optimisation is performed with different concentrations for uniform and Gaussian drain doping profile and for various sectional length of lower work function of the gate electrode. Finally, the effect of temperature variation on the device performance is demonstrated.     

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??Dolomite is the most important rock type for the development of the Ordovician effective reservoirs in the Ordos Basin. Its genesis remains controversial due to its complex and variable rock texture and occurrence. In this paper, through analysis of macroscopic regional geological background, microscopic rock texture, mineralogy, and geochemistry, the Ordovician dolomites in this area are divided into three types, i.e. micritic–fine powder crystal, coarse powder crystal, and fine (medium) crystal. It is pointed out that they were formed in three different dolomitization diagenetic environments, namely, penecontemporaneous dolomization by evaporative pumping, mixture dolomitization of freshwater and magnesium-rich brine, and seepage-reflux dolomitization, respectively. In terms of horizon and spatial distribution, they represent the features of "strata-controlled" and "region-specific". The analysis of genesis provides the following findings. First, the three types of dolomitization are correlated to certain extent in terms of temporal–spatial evolution. In other words, they were all originated along with the deposition of gypsum mineral under evaporation background. Second, the main pore types, i.e. dissolved pores, intercrystalline pores, and organic framework, were respectively formed in three types of dolomites. They generally distribute in "specific" type of dolomite, which indicates that the pore genesis is closely related to dolomitization diagenesis environment. Third, the development and distribution of effective dolomite reservoirs is mainly subject to three types of elements, such as primary sedimentary faices belts, diagenetic environment controlling regional dolomitization, and sequence boundary caused by variation of relative sea level.