含理想二极管电阻电路的分析

理想二极管是“电子线路”课程中学生第一个接触的非线性理想器件,也是最为简单的非线性器件。含理想二极管电阻电路虽是一类简单的非线性电路,但对于学生理解非线性器件的特性、掌握直流大信号电子电路的分析方法具有引导性的意义。笔者总结了含理想二极管电阻电路的三种分析方法：观察法、预猜验证法和开路电压法,并应用于教学实践中,取得了...     

2004'北京大学生EDA竞赛分析

电子系统与元器件的建模分析技术是现代电子技术研究与应用的核心,而CMOS单元则是目前绝大多数集成电路的基本元件。2004’北京大学生电子电路设计竞赛中,以促进模拟电路教学改革为基本目标,突出了现代电子技术的主要器件MOS管的应用与电子电路建模方法及其应用设计技术。竞赛以EDA工具为基本分析和设计工具,以仿真分析为基本内容,比较全面地突出了现代电子技术的应用技术与方法。本次竞赛对教学起到了良好的促进作用。本文是赛前辅导教师培训课题的内容总结,同时也是对竞赛背景的介绍。     

Hybrid Analysis of Nonlinear Circuits: DAE Models with Indices Zero and One

We extend in this paper some previous results concerning the differential-algebraic index of hybrid models of electrical and electronic circuits. Specifically, we present a comprehensive index characterization which holds without passivity requirements, in contrast to previous approaches, and which applies to nonlinear circuits composed of uncoupled, one-port devices. The index conditions, which are stated in terms of the forest structure of certain digraph minors, do not depend on the specific tree chosen in the formulation of the hybrid equations. Additionally, we show how to include memristors in hybrid circuit models; in this direction, we extend the index analysis to circuits including active memristors, which have been recently used in the design of nonlinear oscillators and chaotic circuits. We also discuss the extension of these results to circuits with controlled sources, making our framework of interest in the analysis of circuits with transistors, amplifiers, and other multiterminal devices.     

现代电子设备的可靠性设计技术

可靠性设计是现代电子设备可靠性保证体系的关键环节。阐述了电子设备可靠性设计的基本原则与实施途径，包括元器件的可靠性选用、电子线路的可靠性设计以及印制电路板的可靠性设计等。     

探析电路定理在电子线路中的应用

电子线路这门课程是一门应用性很强的电子类学科,这就要求我们学习这门学科的时候要多注重理论联系实际,这样才能帮助我们更好的理解.电路定理是电子线路学习中的一种非常重要的工具,它可以把电子线路的分析过程中较为繁琐的计算步骤变得简单又容易理解.在学习电子线路知识的过程当中注意合理的运用电路定理可以使电路知识学习起来更加简单高效.是电子类专业的学习中一项基本的理论.本文着重研究电路定理在电子线路中的应用,来帮助大家更好地理解电子线路这门课程.     

A unified discrete-time state-space model for switching converters

A unified nonlinear state-space model for arbitrary switching converters is presented, which uses discrete-time modeling of switches. Although its compact and powerful notation is valid for all types of switching circuits, perhaps its main application field is power electronics. The proposed model is valid for any electric circuit composed of ideal switches (externally or internally controlled), RLC elements and energy sources. Therefore, the model is general considering semiconductor devices as ideal switches, which are dealt with as discrete-time dynamic systems. Thus the developed model may be either a hybrid continuous-discrete-time one or a full discrete-time one. Moreover, this model is valid as a circuit simulator     

Study of Novel Slow Wave Circuit for Miniaturized Millimeter Wave Helical Traveling Wave Tube

Two kinds of novel helical slow wave circuit, supported by Chemical Vapor Deposition (CVD) diamond, are presented. They are applying in miniaturized millimeter wave helical traveling wave tube. Cold test characteristic of these circuits are simulated by MAFIA code. Higher performances are achieved with smaller size, compared with conventional circuit supported by BeO rods. The nonlinear analysis is implemented by Beam and Wave Interaction (BWI) module, which is a part of TWTCAD Integrated Framework. Results have been found to be consistent with the expectation. It should be wider apply in microwave and millimeter wave vacuum electronic devices.     

模电教学中BJT与MOS的近似性分析

BJT 与MOS器件及电路是模电重要内容；教学中二者的电路模型与分析方法不一致，学生困惑于两套不同的器件及电路知识。本文在遵循器件及电路工作原理的基础上，首次将二者在小信号模型、电路参数、I-V方程、特性曲线、工作区间、指标计算上进行完整的近似性分析及一致性推导；在二者电路计算中，用三种单管单级放大器实例，阐述近似分析方法的便利性。本文是模电教学的有力补充。     

Nonlinear circuit theory: Resistive networks

The impact of computers on circuit analysis and design and the advent of new electronic devices and integrated circuits have generated much interest in nonlinear circuit theory. Recent successes in the analysis of large-scale systems using network models have further enhanced the importance of the subject. A key to the understanding and analysis of nonlinear circuits is the study of nonlinear resistive networks both in theory and in computation. In the study of nonlinear resistive networks it is necessary to know the global properties of nonlinear functions. Thus Palais' global inverse function theorem is of paramount importance. In addition, a global implicit function theorem is often needed. The latter is given in this paper. We apply the global theorems to derive results on nonlinear networks with unique solutions and with multiple solutions. The theory obtained for networks with multiple solutions can be used to analyze and design bistable circuits. In computation, we extend Katzenelson's piecewise-linear analysis to general nonlinear resistive networks. For networks which have a unique solution under all possible inputs, the method converges in a finite number of steps. In addition, we present an efficient method of computing input-output characteristics of networks with single or multiple solutions.     

基于Multisim的电子线路分析与仿真

针对传统电子技术课程教学中存在的问题,提出在教学中引入Multisim进行辅助分析。利用Multisim对电子技术课程中的典型电路进行仿真,其各项结果与理论一致,且可以很方便地改变电路元件参数,观察不同条件下电路的工作情况。将虚拟实验和传统教学有机结合起来,能更好地提高学生的学习积极性和探索精神。     

Computer models of the field-effect transistor

The use of general network analysis programs to analyze complex electronic circuits requires that valid models be developed for the active devices in these circuits. A nonlinear model of the field-effect transistor is presented for use in large-signal applications. From this model several piecewise-linear models suitable for use with an Electronic Circuit Analysis Program (ECAP) are derived. The approximations usable in these models are evaluated, and models intended for use in pulse inverters are presented. Techniques for measuring the parameters in the models are described and results of the measurement of these parameters for a sample of field-effect transistors are given. Finally, the behavior of actual pulse inverter circuits is shown to compare favorably with ECAP-Computed circuit performance.     

On the analysis of nonlinear resistive networks considering the effect of temperature

In this correspondence a new method is presented for the analysis of nonlinear resistive networks considering the effect of the dissipated-power-dependent inner temperature of electronic devices on the electrical behaviour of circuits. It is shown that this consideration is only possible if the equations of the electrical network are extended by equations of the corresponding thermal network of the circuit and if all equations together are solved simultaneously. The temperature is introduced as variable and not as a parameter.     

Data structure and man-machine communication for network problems

A program which provides man-machine communication for the analysis of electronic circuits on a time-sharing computer is presented. The program is a part of AEDNET, a simulator for nonlinear networks, written in the AED-0 language and operating on the Project MAC time-sharing computer. The Electronic Systems Laboratory display console is used as a graphical input-output device on which the circuit diagram is plotted and the calculation results are observed. The requirements imposed on such a man-machine communication system are discussed and a unified way of answering these requirements is presented by developing some basic network concepts and their associated data structure. From the experience gained in writing and using the system, several conclusions are reached regarding the features that such a communication program should have to insure convenient and natural man-machine interaction.     

A woven inverter circuit for e-textile applications

We present a new type of electronic circuits: e-textiles. Such circuits are made by weaving together specialized component fibers. The fibers have electronic components integrated onto them. Various circuits can be formed by weaving these fibers in various patterns. Connections between fibers are made using contact pads, which are free to move against each other, thus keeping the fabric flexible. We use amorphous silicon thin-film transistors as the active devices and present their fabrication on fiber as well as an inverter circuit woven from the fibers.     

Modeling non-linear power electronic circuits with thetransmission-line modeling technique

This paper describes a nonlinear transmission line modeling technique that can be employed to model power electronic circuits. The nonlinearities that can be dealt with also include the switching action of the power devices as well as the nonlinear behavior of saturable inductors and multilayer capacitors. With this new nonlinear technique, the transmission line modeling technique can now be used as a generalized discrete-time modeling tool for power electronic circuits. The nonlinear technique is demonstrated in two examples and the simulations are found to be satisfactory     

电路课程工程实例教学探索与研究

电路的工程应用性是电路课程教学的一个显著特点,这就要求电路的教学除了注重电路的基本理论和基本方法之外,应将电路的工程应用放在重要的位置。本文讨论了工程实例电路在电路课程教学中的应用。提出了工程实例电路的选择原则,介绍了工程实例电路的具体教学表现形式和实际应用效果。     

PSpice仿真软件在收音机电路分析中的应用

电子设计自动化(EDA)技术已渗透到电子系统和专用集成电路设计的各个环节,各种软件被应用到电子设计和仿真中,使电路的设计、调整和改进更加高效便捷。简单分析了超外差式调幅收音机电路的工作原理,并采用在业界广泛使用的PSpice仿真软件,以456 kHz调幅产生电路代替调谐输入电路,通过电路网单方式对该电路进行直流工作点分析、瞬态响应分析及交流分析,仿真其直流工作点、瞬态响应波形及幅频特性曲线,较真实地反映了电路的特征。     

Compensation of Low-Frequency Disturbances by Means of Linearization of the Electronic Systems Characteristic

A mechanism to demodulate a two-tone high-frequency oscillation in nonlinear electronic devices due to an external electromagnetic field is investigated. The results of a demodulation are low-frequency disturbances to the internal circuits of electronic devices. A method for the synthesis of nonlinear compensators on the basis of the operational equations of electronic devices is offered for protection against low-frequency noise. The nonlinear operator of the compensator is designed so that a cascade connection of the electronic device and the compensator is described by the linear Volterra functional. As an example, the compensation of nonlinear transformations of a detector at high-frequency oscillation is synthesized with the use of results of measurements. The accuracy of the executed compensation is estimated.      

Switching delay of a switching system related to the characteristics of the input signal

The systematic dependence of the switching delay occurring in a regenerative circuit is briefly analysed as a function of the input signal. The switching circuits are identified as circuits with positive-feedback loops, where the differential gain is controlled by nonlinear elements, and circuits using negative-resistance devices.