重建一维多层媒质的时域信号流图法

本文首次提出重建多层媒质的时域信号流图法。通过多层媒质的等效网络,引出时域信号流图的概念,建立其使用法则。借此分析了多层媒质的时域反射机理,并给出重建方法。     

S参数微波网络的增广网络原理及其计算机辅助符号分析

本文提出了分析S参数微波网络的增广网络原理,给出其封闭信号流图和约简信号流图,并详细讨论了它们的拓扑和代数特征。导出了一个一次生成网络全部外特性的全符号表达式的代数直接算法。最后给出其应用实例。     

关于复归一化反射系数不变性定理

本文通过对给定阻抗的Darlington等效网络的单位归一化散射矩阵的研究,提出了一个n端口网络对n个非Foster正实阻抗复归一化散射矩阵和其增广网络单位归一化散射矩阵之间的关系,这里Darlington等效网络是互易的,也可以是非互易的。从而进一步证明了Carlin-Yarman复归一化反射系数不变性定理是不正确的。     

线性n端网络的等效网络定理

本文给出了线性n(≥2)端网络的等效网络的最简结构,证明了线性n端网络的等效网络定理。二端网络的戴维宁-诺顿等效网络定理,是本文所提出的多端网络等效网络定理的特例。     

规范正交梯形结构对数域滤波器

提出了一种基于规范正交梯形网络信号流图模拟的对数域滤波器设计方法.能直接对给定的任意高阶传输函数进行综合.用该方法设计了1dB波纹三阶椭圆埘数域低通滤波器.Pspice仿真表明,所设计的滤波器实际频响特性几乎是理想的,而且具有电路结构简单、需要的元件数少、灵敏度低和最优的动态范围等特性.     

信号流图在微波网络中的应用

在文献[1]中已对信号流图及其在电子电路中的应用作了阐述,本文拟介绍它在微波网络中的应用.为此,先对用来描述微波结构外特性的网络参数作一简要说明;给出一些常用的微波结构及其相应的信号流图;举几个应用的例子.利用信号流图来研究微波网络,不仅物理概念清晰,且可简化很多繁杂的计算.     

开关电容网络的一种新的符号分析法

本文给出了一种获得一般开关电容电路全符号网络函数的新方法。这种方法是从网络的最小系统方程出发,推出描述网络的闭合信号流图矩阵,从而通过寻找回路和分类获得符号网络函数。最后给出了计算机分析实例。     

一种新型的ShuffleNet多跳等效时分复用网络

文章介绍了多跳网(ShuffleNet)的结构和路由算法,提出了一种新型的ShuffleNet等效时分复用网络,给出了该网络结构的路由算法,并对8节点的基于光时分复用的ShuffleNet等效网络性能进行了分析。     

负反馈放大器的信号流图解法

计算负反馈放大器的电压放大倍数需要按照反馈类型分解为基本放大电路和反馈网络,确定应采用的广义放大信数A和反馈系数F的公式,利用反馈深度求得A_f,再经换算才能解出电压放大倍数。有时放大器包含几种类型的反馈,反馈深度也不是很大于1,都更增加了求解的困难。对于线性系统,信号流图分析的应用极为广泛。应用网络信号流图将来知变量与有向图的节点相对应,变量的因果关系通过流图直接显示出来。同时,由图的结构可以直接对系统求     

信号流图的简化规则

在本刊1964年第3期曾介绍过计算网络的信号流图法.该文主要根据麦孙(Mason)公式进行计算.显然这是一个系统的典型方法,但是复杂的麦孙公式也带来了不易记忆以及在考虑通路与互不接触回路时容易遗漏等缺点.在信号流图理论中,麦孙以及后来的一些学者叙述了将信号流图进行简化的方法.这种方法的优点在于很直观,容易记忆.本文就对这一方法略作介绍.     

On the analysis of switched capacitor networks using equivalent networks in the z-domain

The approach using the equivalent networks in the z-domain to analyze switched capacitor (SC) networks is very attractive. The proposed analysis method in this paper permits calculation of the frequency response of SC networks by means of the signal flow graph (SFG). In the first place the equivalent network is derived by applying a group of basic building blocks which are obtained under the consideration of generality and practicability. At the same time some specified transformations are proposed, with which the basic building blocks can be greatly expanded to fit into direct use. These transformations are also found to be useful in designing SC filters. The application of the well-known SFG facilitates the derivation of discrete transfer functions. Furthermore the sensitivity of SC network can be calculated with a simple topological formula. The whole work can be done by inspection; this is the highlight.     

Simple technique for analysis of SC networks using general-purpose circuit simulation programs

A new technique is proposed which enables the transformation of a large class of switched-capacitor (SC) networks into equivalent time-continuous (analogue) circuits to analyse them by use of standard, general-purpose circuit simulation programs such as SPICE It is based on a block partitioning, i.e. a total SC network is divided into small building blocks. It is shown how basic SC building blocks like integrators and summers can be modelled by equivalent two-ports containing only resistors, lossless transmission lines and current-controlled voltage sources. Furthermore, some new offset-free SC integrator schemes based on multi-step integration algorithms are also described.     

By-inspection analysis of switched-capacitor networks †

The recent advances in implementation of analogue MOS switched-capacitor (SC) networks have established a need for new methods of analysis of these circuits. In this paper an analysis method of SC networks operating with an n-phase clock is presented. The method is based on a building block approach which facilitates the derivation of a z-domain equivalent circuit. The equivalent circuit is then analysed using the flow-graph technique.     

Simple approach to analysis of switched-capacitor circuits with nonideal op-amps

A possible method for the simulation of nonideal op-amps with a finite gain and bandwidth by means of an equivalent SC circuit, containing ideal components, is presented. The approach is extended by the case of an op-amp with non-switched input SC building blocks.     

不含频相关元件的连续时间等效电路的SC网络分析

正 1.引言 近年来,对SC网络分析方法的探讨引起了人们的注意。一些作者提出并发表了若干利用连续时间等效电路分析SC网络的方法。 在文献[1,3]中,作者应用标准Z变换和LDI变换推导了连续时间等效电路,导出的电路含有频相关元件。进行网络分析时,确定这种频相关元件的参数值对每一频率点都     

开关电容网络的广义节点故障诊断及可诊断性

本文首次引入了开关电容网络广义节点故障诊断的概念,提出了一个简单、准确、有效的算法,并着重强调了应用广义节点概念的优点。本文还探索性地研究了开关电容网络的可诊断性,并给出了可诊断性的必要条件。     

SC integrator for high-frequency applications

The time discrete integrator is a basic building block for a wide range of SC networks. Owing to the finite bandwidth of the amplifier, most of these networks are limited to applications in the audio frequency range. To overcome this restriction, a simple modification of the integrator circuit is presented, which allows the realisation of integrator-based SC networks at frequencies much higher than the audio range.     

SC网络分析的标度-Pauper算法

本文讨论了一种SC网络的频域分析方法,首先探讨了SC网络的标度性质,根据这条性质和特定的Pauper算法,可以用积木块法将SC网络用一个由放大器、电阻和电容组成的连续时间模拟电路来等效.于是,SC网络的频率响应和灵敏度可以调用现有的标准模拟电路分析程序算出,而无须编制专用程序,与已有方法比较,本方法具有计算速度快的优点。     

模拟神经网络稳定性研究

本文提出了模拟神经网络稳定性分析的静态等效模型,通过推广特勒根定理,从等效模型导出了物理意义清晰的能量函数。由一阶微分方程组求网络能量函数的方法普适于所有的一阶连续自治系统。文章并利用能量平稳原理对点格神经网络的稳定性质进行了讨论,得到了一些对于网络的电路实现具有一定指导意义的结果。     

Simplified Analysis of Coupled Transmission-Line Networks

A relatively simple method is presented for analyzing coupled transmission-line networks by using network graphs and graph transformations. The network graph symbolism is easy to draw and to manipulate. All the graphs consist only of inductor, capacitor, and transformer symbols, and straight lines, which represent unit elements. The method of analysis is illustrated by several two-wire-line and multiwire-line examples. Also presented are several new useful transmission-line transformations and a graph equivalent for the general coupled transmission-line network. The graph-transformation method has four principal advantages: 1) explicit open-wire-line equivalent circuits of coupled line networks can be obtained relatively easily and without knowledge of network synthesis techniques; 2) the form of equivalent circuits can often be obtained without using any algebra; 3) at each step of the analysis, a positive-real network in graph form is available; consequently, in many analysis problems several equivalent circuits for the same network are derived; and 4) multiport networks are as easily dealt with as two-port networks.