利用强结构扰动理论确定高维滞环多值电路唯一稳态

利用LYPUNOV方程，得到了确定含有多值元件电路的唯一稳态的新条件。结果中电路元件可以是多值的，这大大放松了目前已有的经典结果中要求电路元件为单值的限制，扩展了已有的结果。     

利用强结构扰动理论确定高维滞环多值电路唯一稳态

利用LYPUNOV方程，得到了确定含有多值元件电路的唯一稳态的新条件。结果中电路元件可以是多值的，这大大放松了目前已有的经典结果中要求电路元件为单值的限制，扩展了已有的结果。     

确定高维非线性电路唯一稳态的λ参数法

本文以元件成份关系斜率变化区间对应的常数矩阵为基础，通过引入一个参变量λ构造出多个新的矩阵。通过对这些包含参变量λ的矩阵的分析，从而确定原电路的唯一稳态。本文的结果对电路元件的约束，仅要求其成份关系斜率有界即可。这大大放松了目前已有的经典结果中要求电路元件斜率为正的限制，扩展了已有的结果。     

用Protel99(se)仿真功能进行的电路仿真研究

参数扫描法是电路CAD软件Protel99(se)的一项重要仿真功能.以一个基本放大电路为例,在一个Protel99(se)的仿真元件库中已有的、和实际电路元件具有相似的主要电学参数的仿真元件的基础上,将其某些参数(本例为β值)扫描到实际电路所需的参数数值,从而实现了在软件Protel 99(se)中改变仿真元件的某些模型参数以进行电路的仿真研究的目的.该方法的意义在于:既可以利用Protel99(se)软件进行电路在各种元件参数下的仿真分析研究,也便于学生利用软件代替实物做各种电路仿真实验.     

用“坐标关联”解非线性元件的串并联问胚

非线性元件的电流与电压不成正比,不易写出具体的函数表达式,用解方程的方法解决非线性电路问题几乎是不可能的,通常是用伏安特性曲线推算近似结果．本文举例说明电路中有多个非线性元件串、并联时的解题方法．     

简谈“减元件法”——介绍一种化简复杂电路的方法

识别复杂电路，画出其等效电路图有很多种方法，“减元件法”就是其中的一种．“减元件法”就是在较多元件组成的复杂电路中，减(拿)掉一个或多个接法特殊的元件，由于减掉了接法特殊的元件，电路也就容易识别了，最后再把减掉的元件接上去，这样做并未改变电路的结构和性质，下面通过几个例子来说明“减元件     

三值GaAs场效应晶体管电路的研究

探讨了具有缓冲功能的三值ＧａＡｓ电路的基本结构,并根据ＰＳＰＩＣＥ程序的模拟结果,提出了逻辑级的电路的结构,建立了对应的开关模型,根据该模型提出了三值ＧａＡｓ在开关元件级的电路设计方法。     

基于Matlab的逆向工程法在电工课程教学中的应用

文章提出了一种分析电路结构的方法,通过测量RLC黑盒电路输入信号和输出信号来分析电路结构及估算电路元件值。整个教学过程基于Matlab Simulink软件环境,减少对硬件及场地的依赖。实验结果及调查问卷表明该教学方法提升了学生的学习兴趣和教学效果,丰富了电工类课程的教学手段。     

“一阶”电路暂态过程中初态值的计算

在研究“一阶”电路RC电路或RL电路)的暂态过程中,电路的初态值是分析暂态过程的三要素之一.电路初态值计算方法一般有两种.下面就此问题作一些探讨.暂态过程的产生是由于物质所具有的宏观能量不能跃变而造成的,即体现为电感元件上的电流和电容元件上的电压不能跃变(换路定则).初态值的计算首先主要指储能元件上的电压或电流而言,我们设t=0为换路瞬间,t—0 表示换路后的初始瞬间,t=0—表示换路前的终了瞬间.由换路定则可知:     

一阶动态电路的三要素法

电路中仅含一个贮能元件(L或C)或经化简后只含有一个贮能元件时,描述电路性状的微分方程为一阶微分方程,相应的电路称一阶电路。用经典法求解一阶动态电路时,必须以贮能元件C两端电压或L上的电流为变量建立微分方程,进行求解,从而求出其他电路的电压或电流。这种方法对多回路、多节点电路求解显得很麻烦。从数学角度并结合电路的物理意义可知:一阶线性微分方     

非线性非自治电路的唯一稳态

本文利用矩阵分解方法 ,在用常数界定元件成分关系斜率条件下 ,得到了确定具有分解形式的高维非线性非自治电路唯一稳态的条件。可以由分解矩阵的稳定性决定     

CCⅡ有源RC电路模拟的新型理想接地可调电感器

本文提出了两种用CCⅡ有源器件实现的模拟理想接地电感新电路,这两个电路均只用两块CCⅡ器件及三个无源接地元件,所模拟电感大小可由这三个无源接地元件独立调节,且对有源参数变化不敏感,适当选取无源元件的类型也可实现理想接地频变负阻。     

Integrated Circuits and Microminiaturization

The meanings of the words microcircuits, molecular electronics, integrated circuits, and functional devices are examined with the conclusions that, as generally used, the only sensible definitions are as follows: a microcircuit is one in which connections are made between circuit elements on a microscopic scale. Molecular electronics, integrated circuits, and functional devices all have essentially the same meaning, which is that connections are made between circuit elements inside a single block of material without bringing leads out. The next order of miniaturization that is required for space vehicles and large-scale computers will use a microeletronic or molecular electronic technology in combination with conventional miniature techniques. The feasibility of very large components of systems being made by a molecular or microelectronic technique depends on the combination of many orders of magnitude reduction in manufacturing shrinkage combined with the design of circuits to tolerate unreliable or defective elements.     

The Moore＇s Law for photonic integrated circuits

We formulate a ＂Moore＇s law＂ for photonic integrated circuits （PICs） and their spatial integration density using two methods. One is decomposing the integrated photonics devices of diverse types into equivalent basic elements, which makes a comparison with the generic elements of electronic integrated circuits more meaningful. The other is making a complex component equivalent to a series of basic elements of the same functionality, which is used to calculate the integration density for functional components realized with different structures. The results serve as a benchmark of the evolution of PICs and we can conclude that the density of integration measured in this way roughly increases by a factor of 2 per year. The prospects for a continued increase of spatial integration density are discussed.     

相乘器在频率变换技术中的应用

频率变换是无线电通信系统中不可缺少的过程，频率变换是由非线性元件及其组成的电路来实现。相乘器是由非线性元件组成，可以实现两个信号的相乘，完成频率变换的电路。该文从原理上分析了相乘器在频率变换中的应用及过程。     

让改革走进课堂——美国新的未来创新项目述评

美国城市学校新的未来创新项目是一个非常典型的只有付出而没有回报的课程改革失败的例子，这一个案分析对我国目前课程改革有着重要的启示。通过对美国新的未来创新项目的反思，能透视我国新课程改革的有利因素与不利因素，提出应对措施。     

微机电系统性能检测的分析与研究

微机电系统是一种集微电子电路和微机械致动器的微小器件,微传感器的性能检测可通过对系统输入量和输出量的检测,选择合适的测试仪器和测试方法来实现.根据角频率的推导,采用频率响应方法,其结果比通过传递函数数值分析得到的谐振角频率精确得多.     

一系列基于CCⅡ的Q增强二阶滤波器

本文提出了一种用单块有源CCⅡ实现的新型有源网络,它可以实现二阶高通、低通和带通滤波器,其特点是电路的ω0和Q值可分别由两个接地元件独立调节,文中还给出了电路的设计、灵敏度分析和实验结果。     

Information Technology and the Emergent Organization

The potential impact of information technology on the workplace is greater than simply changing how work is performed by individuals. Our assumptions regarding information systems in traditional organizations are out of date and being challenged by the capabilities provided by new information technologies. The organization of the future will require a much higher degree of system integration in order to respond to the increasing demands for flexibility and rapid change in the global marketplace. This will require a complete re-thinking of current organizational assumptions and a whole system re-design effort at the organizational level. Performance technologists, in order to play a vital role in building this new organizational future, will need to apply their collective knowledge on the whole system rather than on isolated elements, and to understand the interaction between the technology and the organization.     

Digital Computer Calculation of the Operation of Nonlinear Devices with Energy Storage Elements

This paper presents results on digital computer calculation of the operation of some tube and transistor circuits which combine nonlinear operation with energy storage elements. The Class C amplifier, the frequency multiplier and the blocking oscillator are all circuits of this type. This approach allows many of the conventional restrictions on analysis procedures to be removed. For instance, in the case of the Class C amplifier, it is not necessary to assume that the plate and grid voltages are sinusoidal and the circuit at steady state. Additional features of computer use are the automatic calculation of efficiencies, plotting of waveforms and calculation of harmonic content; the facility of studying the effects of transients and modulation; the possibility of allowing the circuit parameters to take on any values or vary with time or with the voltages and currents; and the possibility of allowing the circuit associated with the device to be more complicated than usually allowed by other methods. Limitations to this approach lie in the cost of programming the problem, and the cost of running the program on an available computer. Questions of numerical accuracy sometimes arise, but can usually be handled with additional programming or running time. If a translator is available which can accept programs in the form of algebraic equations, the programming cost is often negligible. However, running time costs may be appreciable, particularly in the case of a complicated circuit with many storage elements.