共查询到20条相似文献,搜索用时 19 毫秒
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Yumin Xiang 《Journal of Electrostatics》2008,66(7-8):366-368
Developing the expression for calculating the capacitance of an inclined plate capacitor is investigated. From the result when the intersection line of the two planes containing the two electrodes separately lies outside the electrodes, the situation that the intersection line locates on an electrode is treated as a combination of two capacitors. Then the capacitance is achieved in term of complete elliptic integrals. The perpendicular-plate capacitor in such a case is taken as an example for capacitance calculation. 相似文献
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Modeling and calculation of the capacitance of a planar capacitor containing a ferroelectric thin film 总被引:1,自引:0,他引:1
The capacitance of a two-layer planar capacitor containing a thin layer of SrTiO3 is calculated by conformal mapping using the partial capacitanc e method. Simple formulas are obtained for approximation
calculation of the capacitances of individual components of a planar structure, and their limits of applicability are determined.
A relation for the capacitance of a planar capacitor is derived which takes account of the size effect in a ferroelectric
film within the context of the partial capacitance method. The calculated result is compared with the experimentally measured
capacitance.
Zh. Tekh. Fiz. 69, 1–7 (April 1999) 相似文献
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非平行板电容器电场和电容的另一种计算 总被引:13,自引:0,他引:13
通过求解电势的拉普拉斯方程,得到非平行板电容器两极板间的电势分布,从而求出其电场和电容,结果与用其他方法所得结果完全相同. 相似文献
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AlGaN/GaN HEMT外部边缘电容Cofd是由栅极垂直侧壁与二维电子气水平壁之间的电场构成的等效电容.本文基于保角映射法对Cofd进行物理建模,考虑沟道长度调制效应,研究外部偏置、阈值电压漂移和温度变化对Cofd的影响:随着漏源偏压从零开始增加,Cofd先保持不变再开始衰减,其衰减速率随栅源偏压的增加而减缓;AlGaN势垒层中施主杂质浓度的减小和Al组分的减小都可引起阈值电压的正向漂移,正向阈值漂移会加强沟道长度调制效应对Cofd的影响,导致Cofd呈线性衰减.在大漏极偏压工作情况下,Cofd对器件工作温度的变化更加敏感. 相似文献
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利用共焦椭圆柱坐标给出共焦椭圆柱电容器电容的一般表示,求解椭圆柱形电容器和双曲柱形电容器的电容,丰富了此类电容器电容值计算的结果. 相似文献
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Yen-Ru Huang Jing-Ru Huang Yi-Min Chen Ying-Sheng Huang Gerd Keiser San-Liang Lee Kuei-Yi Lee 《Solid State Communications》2011,151(14-15):1022-1024
To achieve the maximum area utilization ratio for a parallel electrode capacitor, an Archimedean spiral was used to design the capacitor pattern. Multi-walled vertically aligned carbon nanotubes (VACNTs) were used for the capacitor electrodes because of their metallic properties and their endurance toward various chemical reagents. In contrast to the parallel plate capacitor, the total capacitance was formed by parallel connections of all unit cells of the individual VACNT capacitors, so that a relatively higher capacitance was obtained. This design can provide a new approach to fill diverse dielectrics into a spiral capacitor to obtain different capacitances for various applications. 相似文献
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采用固体物理理论和方法,研究了单层石墨烯的量子电容和它的温度稳定性随温度和电压的变化规律,探讨原子非简谐振动对它的影响.结果表明:(1)当电压一定时,单层石墨烯的量子电容和温度稳定性系数均随温度升高发生非线性变化,电压小于2.3 V时,量子电容随温度升高而增大,温度稳定性系数随温度升高由缓慢变化到很快增大,电压高于2.3 V时,量子电容随温度升高先增大后减小,而其温度稳定性系数随温度升高由缓慢变化到很快减小.温度一定时,量子电容只在电压值为0.4~2.8 V范围内才变化较小,而电压值大于2.8 V时,量子电容迅速减小并趋于0;(2)与简谐近似相比,非简谐项会使石墨烯量子电容有所增大,且温度愈高,两者的差愈大,非简谐效应愈显著,温度为300 K时,非简谐的量子电容要比简谐近似的值大0.33%,而温度为1 000 K时,差值增大到1.47%;(3)电压在1.5~1.8 V之间,而温度低于800 K时,石墨烯量子电容的温度稳定性系数最小且不随温度而变,储能性能的温度稳定性最好;(4)非简谐项会使它的量子电容热稳定性系数比简谐近似的值增大,且增大的情况与温度有关,当温度为400 K时量子电容热... 相似文献
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介绍了一台大型垂直极化有界波模拟装置所用中间储能电容器(简称中储电容器)的设计过程和实验结果。电容器采用基于元件和组件的模块化设计,呈锥台状结构,支撑壳体为真空工艺玻璃钢材料。电容器容值由模拟装置等效的二级脉冲压缩回路决定,取值为1.8 nF。电容器内部绝缘介质为十二烷基苯,外部绝缘介质为45#变压器油,设计耐压3 MV,其绝缘长度主要由元件的体绝缘特性决定。采用三维电磁仿真软件估算中储电容器与中储开关构成回路的电感为659 nH,接近于实测数据623 nH。电容器上脉冲电压的测量通过对电容器电流进行积分来获取,而电流的采集采用封装在SF6气体中的3个膜电阻并联后所构成测量模块实现。实际运行数据表明,中储电容器容值达到设计值,测量探头标定系数稳定,在工作电压3.1 MV条件下未发生绝缘问题。 相似文献
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A. N. Deleniv 《Technical Physics》1999,44(4):356-360
An analytical method is proposed for calculating the capacitance of a planar capacitor constructed in the form of a two-layer
structure. The method is used to calculate the capacitance of a planar capacitor containing a ferroelectric film. A number
of calculations were performed to check the accuracy of the partial capacitance method. The calculations made it possible
to determine the limits of accuracy of the partial capacitance method for a permissible calculational error of ±3%.
Zh. Tekh. Fiz. 69, 8–13 (April 1999) 相似文献
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利用电场能量和电容器的能量公式,解出非平行板电容器的电容和电场分布.该方法严谨易懂,图像清晰,另辟新径. 相似文献
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介绍了在微机控制的自动测量装置中采用的双极性电容器的测试方法。这种方法用反相运算放大器微分电路获得与电容器相关的两个工频电压,并通过对它们数字化输入微机内存,最后通过对数字化后的两个周期信号进行处理求得电容量和损耗角正切。 相似文献
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本文分别研究了平行圆形板和矩形板电容器的电容随其尺寸变化的规律.对于每种电容器,首先假设电荷在极板上均匀分布,由此能较简便地得出电容的近似值,然后用Ansoft软件作有限元仿真,得出更精确的数值.通过对比发现,用均匀带电近似得出的结果能够正确地反映电容随其尺寸变化的趋势,优于教科书中的平行板电容器公式;但其数值偏小,原因在于电荷在极板上并非严格地均匀分布,而是中间少、边缘多. 相似文献
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Accurate capacitance-voltage characterization of organic thin films with current injection 下载免费PDF全文
To deal with the invalidation of commonly employed series model and parallel model in capacitance-voltage (C-V) characterization of organic thin films when current injection is significant, a three-element equivalent circuit model is proposed. On this basis, the expression of real capacitance in consideration of current injection is theoretically derived by small-signal analysis method. The validity of the proposed equivalent circuit and theoretical expression are verified by a simulating circuit consisting of a capacitor, a diode, and a resistor. Moreover, the accurate C-V characteristic of an organic thin film device is obtained via theoretical correction of the experimental measuring result, and the real capacitance is 35.7% higher than the directly measured capacitance at 5-V bias in the parallel mode. This work strongly demonstrates the necessity to consider current injection in C-V measurement and provides a strategy for accurate C-V characterization experimentally. 相似文献