Closed-Form Expressions of 3-D Via Resistance, Inductance, and Capacitance

Closed-form expressions of the resistance, capacitance, and inductance for interplane 3-D vias are presented in this paper. The closed-form expressions account for the 3-D via length, diameter, dielectric thickness, and spacing to ground. A 3-D numerical simulation is used to extract electromagnetic solutions of the resistance, capacitance, and inductance for comparison with the closed-form expressions, revealing good agreement between simulation and the physical models. The maximum error for the resistance, capacitance, and inductance is less than 8%.      

Determination of the Capacitance, Inductance, and Characteristic Impedance of Rectangular Lines

This paper determines the capacitance, inductance, and characteristic impedance of rectangular lines by the method of conformal transformation. In practical applications, such lines may be used as transmission links of RF energy, as impedance-transforming sections, or as components in electron tubes. Formulas are given for the calculation of the parameters of rectangular lines having the following characteristics: 1) The inner conductor may have varying thickness compared with the depth of the outer conductor. 2) The axes of the conductors may coincide or may be displaced with respect to each other. 3) The edges of the inner conductor may be rounded to lessen the electrical stress occurring at sharp corners. Excellent agreement has been obtained between the calculated results and those found by use of the relaxation method, by direct measurement of models, and by electrolytic tank measurement.     

基于CPLD实现电阻、电感、电容的测量

介绍了基于EDA技术的电阻、电感、电容的测量。本系统以CPLD为控制核心,在MAX PLUSⅡ10.0环境下采用VHDL语言实现了数据采集、转换及显示。该系统具有测量精度高、硬件简单、灵活性强、易于开发等特点。     

先进的阻抗与电容测量转换器

本次在线座谈主要介绍了ADI先进的阻抗与电容测量转换器的原理及应用。本文包括两部分内容：第一部分主要讨论阻抗转换器,第二部分主要讨论电容转换器。在这两部分中,我们先回顾电阻和电容测量方法的主要特点,然后介绍ADI针对这两种应用推出的先进的阻抗数字转换器及电容数字转化器。     

分布电容和分布电感比拟关系的严格推证

比拟法是强电类“电磁场”教学的一个重要内容,本文首先分析某些现行“电磁场”教材利用比拟原理在推导平行平面场中关于分布电容和分布电感参数之间的比拟关系所存在的缺陷,同时详尽地给出了比拟关系的严格推证。该研究工作对本科生和研究生在学习过程中深化理解比拟法,提高理论素养也具有重要的意义。     

射频E类功率放大器并联电容技术研究

为了使E类放大器工作效率最大,需要得到并联电容的确切数值.分析了含线性并联电容E类放大器的和含非线性晶体管寄生输出电容E类放大器的不同特性,给出了不同的设计方法.指出了E类功率放大器设计过程中分析和计算并联电容的难点,阐述了E类功率放大器中并联电容对电路性能的影响,同时给出了考虑并联电容的E类功率放大器的设计方法.     

基于泰勒级数法的矩形互连线自感计算公式

根据Ruehli的PEEC(Partial (Partial Element Equivalent Circuit)模型[5],矩形截面互连线(Interconnect)的部分电感定义为一个六重积分解析式,由于使用该式计算自感时,被积函数会存在奇异点,因此需要研究准确简便的自感计算方法.文中首次使用泰勒级数展开法计算得到了矩形互连线自感公式.该方法从自感公式出发,先计算二重解析积分,然后把被积函数中的复杂函数展开成泰勒级数,从而转化为幂级数的逐项积分,推得自感计算公式是以导体尺寸为变量的简单显式函数.计算结果表明,该公式与直接积分方法具有同样的计算精度,并且比其它自感计算公式更加准确有效.     

利用实测数据制定可靠性试验剖面综述

首先,分析了利用可靠性试验标准计算可靠性试验剖面的局限性;然后,介绍了利用实测数据制定可靠性试验剖面的益处;最后,总结了利用实测数据制定可靠性试验剖面的一般过程及常用的数据处理方法,对于今后可靠性试验剖面的制定具有一定的指导意义.     

Capacitance and Inductance Matrices for Multistrip Structures in Multilayered Anisotropic Dielectrics

In this paper we present a unified variational approach to determine the capacitance and inductance matices of generalized multistrip systems embedded in a multilayered iso/anisotropic dielectric lossless medium. The analysis is earned out in the spectral domain to take advantage of previously obtained recurrence relations which calculate the Green's function in the spectral domain. The method leads to a low-order system of linear equations, which is shown explicitly. Examples and comparison with previously published results have been included.     

电阻电容电感测试仪的设计与制作

本电阻电容电感测试仪以AT89S52单片机为控制核心,通过测量频率来间接测量电阻器的阻值、电容器的容量和电感器的电感量,并对测试数据和测试结果进行保存记录,可调出最近十次的测量结果并显示测试的时间、元件类型、参数;所有测量的量程均能自动转换量程,并显示相应的提示语句。     

Approximate Formulas for Line Capacitance and Characteristic Impedance of Microstrip Line

A numerically efficient and accurate method for the derivation of line capacitance and characteristic impedance of a thin microstrip line is discussed. Galerkin's method is found to give highly accurate results when only one or two basis functions are used. We use three methods to derive approximate formulas for microstrip line capacitance and characteristic impedance. Asymptotic lower bounds derived through the variational method and matched asymptotic expansion methods give expressions which reveal the functional forms of these approximate formulas. Seminumerical approximation gives rise to formulas usable on a desk calculator. It is found that there is excellent agreement between the seminumerical formulas, the asymptotic formula derived through matched asymptotic expansions and numerically derived results.     

物联网感知线圈电感量设计与阻抗匹配

阐述了13.56 MHz工作频率线圈的电感、电容满足一定条件下实现电磁振荡的原理,设计了线圈的电感量,提出了并联谐振电路电容、电阻混合阻抗匹配的计算公式.通过计算,矩形PCB微带线线圈和矩形空心线圈电感值分别约1 ìH和2 μH.根据线圈电感量,理论计算与Smith圆图仿真相结合确定电容、电阻混合阻抗匹配参数值.匹配电路简单,经单个参数和系统测试,测量值与理论值相符,且线圈能正常使用.该设计成果可广泛应用于13.56 MHz的RFID等物联网系统中.     

T型甚低频多调谐发射天线电容与电感研究

甚低频天线理论认为,采用多调谐方式,T型甚低频多调谐天线可以基本按比例增加天线电容,在实际工程中常用五组或六组天线.本文利用甚低频天线输入电抗的实测值,计算了在不同频率下天线所呈现的等效电容和等效电感,研究了T型甚低频发射天线的等效电容、电感、功率容量与天线组数及频率之间的关系.研究结果表明T型甚低频多调谐天线的组数过...     

A Simple and Enriched Closed-Form Formula for Cell Residence Time in 5G Heterogeneous Networks

Wireless Personal Communications - Libraries may become a liability for users security. Existing studies show that libraries can be exploited to propagate malware. Hackers utilize fake or modified...     

A Versatile Active Circuit for Realising Floating Inductance, Capacitance, FDNR and Admittance Converter

An active circuit suitable for realizing floating inductance, capacitance, FDNR and admittance converter depending on the selection of passive elements of the circuit is presented. The proposed circuit employs only two dual output second-generation current conveyors (DO-CCIIs) and does not require passive element matching. The proposed network has a grounded capacitor for the floating inductance and capacitance simulation. Frequency performance of the circuit is tested using SPICE.     

一种基于TDR测量的高速连接器的MMTL模型

该文提出了一种全新的高速连接器时域模型MMTL(Multi-segment Multiple Transmission Line model)。该模型克服了MLC模型不稳定和仿真效率低的缺点,具有直观、精度可控、便于优化等优点。实验结果表明,该文所建模型精度高,与实际测量的最大误差小。     

压电分流阻尼系统中压电元件形状与布局优化

根据压电方程和材料力学方程推导出机电耦合情况下压电元件表面电荷计算公式,以此为优化目标,对压电分流阻尼抑振系统中的压电元件形状和位置/布局进行了优化分析。在考虑了压电元件附加质量和附加刚度的影响下,采用ANASYS的APDL语言对四边固支弹性薄铝板进行参数化建模,根据压电元件的模态应变来计算电荷数量。使用拓扑优化方法得到对应于各阶模态的压电元件最优形状,并针对采用单片和多片压电元件的情况,进行了对应于结构各阶振型的布局优化。根据分析结果,提出了压电分流阻尼系统的压电元件形状和位置/布局优化的基本原则。将分析结果应用于一四边固支薄板的振动响应抑制实验,取得了良好的抑振效果,分流电路闭合后第1阶和第5阶模态响应的幅值分别降低了52.9%与62.6%,验证了压电元件形状和位置/布局优化的有效性。     

基于有源电容倍增器的新型电荷泵DC-DC变换器

电荷泵中浮置电容是影响输出特性的关键因素,针对大容量浮置电容难以集成的问题,提出利用电流传输器构成有源电容倍增器代替浮置电容的方法,可使等效的浮置电容容量提高1~3个数量级.利用PSPICE软件对反压及倍压电荷泵分别在采用有源电容倍增器和理想电容的情况下进行仿真,对比分析的结果说明采用有源电容倍增器的电荷泵电路仅需要很小的电容就能得到与外加大容量浮置电容电荷泵电路相同的输出特性(实例中100pF可等效50nF),从而基于有源电容倍增器的电荷泵将更易于全单片集成.     

The Effect of Mutual Inductance and Mutual Capacitance on the Transient Response of Braided-Shield Coaxial Cables

A quantitative comparison is made of the importance of mutual inductance and mutual capacitance in the leakage of transient signals through the braid of a coaxial cable. The difference between mutual inductance and mutual capacitance coupling is vividly exhibited in the transient predictions. Comparisons of predictions to measurements made on a length of RG-214 test cable are also included.     

Erratum to "Approximate Formulas for Line Capacitance and Characteristic Impedance of Microstrip Line"

It has been called to the author's attention that (3) in the above paper appears to be inadequate, especially for scaling.