摘要:

AbstractNecessary and sufficient conditions are given for resistive circuits containing both monotone‐increasing non‐linear resistors andmonotone‐decreasingnon‐linear resistors (called negative non‐linear resistors), in addition to controlled sources and op‐amps, to have a unique solution for all circuit parameters. Several theorems are given for various classes of circuits containing different combinations of active circuit elements. the theorems are couched mostly in topological terms and can therefore be checked by

ISSN:0098-9886    

DOI:10.1002/cta.4490150302

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractThis paper deals with effects of modifications of network structure that may be studied without reference to the type of devices present in the network. We introduce and make systematic use of the notion of a generalized minor of a vector space. This operation generalizes the usual short and open circuit operations for a graph. Using the generalized minor operation we show how to make the equations of a given network appear to be the ‘bordered version’ of the equations of some other specified network. We also consider the decomposition of a network into several ‘multiports’ and a ‘port connection diagram’, and study the properties of a minimal decomposition (with port connection diagram having a minimum number of edges). In each case we present efficient algorithms wherever appropriate. Although the paper makes use of ideas from elementary matroid theory it is entirely self‐contained and requires no more than the knowledge of elementary linear algebra fr

ISSN:0098-9886    

DOI:10.1002/cta.4490150303

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractFour‐port matrix theory is the foundation for various useful methods of analysing switched‐capacitor networks. Thus, for example, signal‐flow graph techniques, the link‐two‐port concept, and nodal computer analysis methods are based on either the four‐port transmission or admittance matrix. In the derivation of these analysis techniques transmission, reverse‐transmission, and transfer matrices are often used, but the relationship between them has not yet been clearly formulated for four‐port networks. In this paper an attempt at formulation and clarification is made. Furthermore, it is shown that, once the considerable simplifications due to the presence of opamps are taken into account, a simple and elegant method of hand analysis for basic SC circuits using a combination of transmission and transfer matrix par

ISSN:0098-9886    

DOI:10.1002/cta.4490150304

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractThe method of averaging has been used for years to prove the existence of oscillations in non‐linear circuits. In the past the application of averaging has tended to bead hocrather than systematic. In addition the validity of the method was not well established. the purpose of this paper is to rigorize and systematize the analysis of weakly non‐linear oscillator circuits via the method of averaging. In particular this paper will put on a rigorous foundation the work of Kuramitsuet al.1‐3on the ‘averaged potential’ and the work of T. Endo and others on the oscillatory modes of coupled oscillator circuits. Furthermore we give a novel way of simplifying the calculation of averages when we have a potential function repre

ISSN:0098-9886    

DOI:10.1002/cta.4490150305

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractThe aim of this paper is to identify the topological entities underlying the construction of a complete (not reduced) network model. Consider an active network as a pair of physically different structures, i.e. a ‘dead network’ and an ‘excitation’. First, we define the general structure of the excitation which can be applied to a dead network; then the graphsGaandGof the active and dead networks, respectively, are introduced. It is shown that, if a complete network model is to be constructed, the topological relations among the voltages and those among the currents of the network elements must be written choosing maximal independent sets of loops and cut‐sets ofGa. It is successively pointed out that the graphGcan be obtained fromGaby means of a reduction operation, and the topological entities ofGcorresponding to the loops and to the cut‐sets ofGaare singled out. It has been found that a complete model of an electric network implies the use of four topological entities defined on the set ofG‐edges, i.e. the closed path, the open path, the cut‐set and the pseudo‐cut, together with two topological entities defined on a maximal set of independent vertex couples ofG, i.e. the ‘junction pair’ extreme of an open path and the ‘family of independent node couples’ split by a cut‐set.Furthermore the different reference frames and the relative topological matrix transformations which allow a complete model of the network to be built up ar

ISSN:0098-9886    

DOI:10.1002/cta.4490150306

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractThe silicon implementation of a transmultiplexer system, from the high level description up to the floor‐plan, is presented. the described realization allows to integrate an entire 12‐channel TDM‐FDM transmultiplexer system on a silicon area of less than 80 mm2in a 5 μm single‐metal race‐free dynamic CMOS technology, making use of an available bit‐serial standard‐cell library. At the architectural level, a hardware‐sharing transformation combined with a number of optimizations for the coefficient quantization and the choice of the data word‐length, have allowed for a global area‐reduction of almost 50 per cent.First a mainly manual approach has been investigated, where the hierarchical decomposition has been exploited to perform global and local optimizations in terms of the hardware. Later on, based on this experience, it has been employed as a major test vehicle for the CAD tool‐box of the bit‐serial silicon compiler1,2which has been developed during the pilot phase of an ESPRIT research project at our laboratory. Extensive use has been made of programs for filter synthesis, optimization, bit‐serial mapping, delay management and standard‐cell placement and routing. the results obtained with both design strategies are compared.This research has given a concrete example of how systems, filter, network, circuit and CAD experience can be effectively

ISSN:0098-9886    

DOI:10.1002/cta.4490150307

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

ISSN:0098-9886    

DOI:10.1002/cta.4490150308

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

ISSN:0098-9886    

DOI:10.1002/cta.4490150301

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY