摘要:

AbstractAnalogue delay lines, in the form of charge‐coupled or bucket‐brigade devices, are important network elements that may be used in connection with gain elements and summer–subtractor elements to realize microelectronic filters. This paper establishes invariant lower bounds on the sensitivity of the input–output transfer function to perturbations of the gains and delays of the analogue delay lines. Conventional sensitivity criteria, known as the Worst‐case and Schoeffler criteria, are used to represent the nonideal deviation of the transfer function.It is demonstrated that, insofar as tolerance limitations are concerned, the conventional direct‐form structure (which is extensively employed to realize charge‐coupled‐device filters), is far inferior to the l

ISSN:0098-9886    

DOI:10.1002/cta.4490050202

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

年代:1977

数据来源: WILEY

摘要:

AbstractA simple method is outlined for evaluating the residues in a partial fraction expansion when multiple roots are present. Its application along with Frame's algorithm leads to an efficient scheme for the generation of the constituent matrices when multiple eigenvalues are present.

ISSN:0098-9886    

DOI:10.1002/cta.4490050203

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

年代:1977

数据来源: WILEY

摘要:

AbstractThe paper considers the state‐space synthesis of reciprocaln‐ports with a minimum number of reactive elements. After formulating the synthesis problem new procedures are given for the lossless and for the passive cases which use a directly determinable reciprocal minimal realization as starting point. The methods are presented in terms of admittance matrices and then restated for impedance, hybrid and scattering matrix synthe

ISSN:0098-9886    

DOI:10.1002/cta.4490050204

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

年代:1977

数据来源: WILEY

摘要:

AbstractA new property of impedance transformation is presented that can be applied to semiconductor switching‐diodeQfactor measurements. The only parameter that must be known for the diode holder and the diode package is the efficiency of the energy transmission from the source of the signal to the semiconductor junctio

ISSN:0098-9886    

DOI:10.1002/cta.4490050205

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

年代:1977

数据来源: WILEY

摘要:

AbstractIn the tableau approach to large‐electrical‐network analysis, as well as in structure analysis, the finite‐element method, linear programming etc., a very sparse linear algebraic set of equationsAx = bhas to be solved repeatedly. To efficiently solve the systemviaGaussian elimination, an optimization problem has to be faced: the selection of a pivot strategy to maintain the sparsity of the matrixA. It is possible also to follow a different strategy to fully exploit the sparsity ofA, i.e. to transformAinto an equivalent but more convenient form. Both of these problems have been studied and partially solved by means of directed graphs associated withAwhen symmetric permutations onAare allowed.In this paper, a graph theoretical interpretation has been given to nonsymmetric permutations onA, which can be considered a fundamental step towards the solution of the above‐mentioned optimization problems. This interpretation is obtained through decomposition theorems on nonsymmetric permutations, correspondence theorems between column (row) permutations and topological operations on a directed graph repres

ISSN:0098-9886    

DOI:10.1002/cta.4490050206

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

年代:1977

数据来源: WILEY

摘要:

AbstractThe calculation of a rational transfer function is considered using a Laguerre expansion of the impulse response. An algorithm is proposed that avoids the appearance of high‐order surplus factors. Results of computer experiments are presente

ISSN:0098-9886    

DOI:10.1002/cta.4490050207

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

年代:1977

数据来源: WILEY

摘要:

AbstractThe state–space formulation of linear circuits containing periodically operated switches requires one to obtain the state and output equations. Further, it requires one to obtain the switching equations where discontinuities in the state variables occur at a switching instant. A new method for the computation of the state and output equations is given. Further, a procedure is described to obtain the switching equations, in the most general form, at a switching instant. Examples are given to illustrate these methods in finding the state, the output and the switching equation

ISSN:0098-9886    

DOI:10.1002/cta.4490050208

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

年代:1977

数据来源: WILEY

摘要:

AbstractThe applications of the least‐mean‐square‐approximation technique to filter synthesis are discussed, and explicit expressions for the characteristic function of all‐pole lowpass filters are derived using a weighted least mean‐square error norm. The weight function depends on one variable parameter which controls the shape of the magnitude response both in the passband and in the stopband. It is shown that most of the filter functions in common use are special cases of this approximation procedure, including Legendre monotonic passband filters as a limiting, degenerate case. Also, a useful generalization of Legendre filter functions is

ISSN:0098-9886    

DOI:10.1002/cta.4490050209

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

年代:1977

数据来源: WILEY

摘要:

AbstractA circuit element is nonenergic if the instantaneous power flow into it is always zero. Well‐known examples include the ideal diode, transformer, gyrator and circulator. Most of the interesting nonenergic elements are nonlinearN‐ports withN⩾ 2, and many of their properties are quite counterintuitive. For example, there exists a surprisingly large class of nonenergic multiport capacitors and inductors, all of which, it turns out, are nonlinear and reciprocal. Nonenergic linearN‐ports, on the other hand, are necessarily resistive and antireciprocal.In this paper, we present a rigorous fundamental theory of nonenergicN‐ports that results in a general canonical representation. Special canonical forms are developed for nonenergic resistors, capacitors and inductors, and numerous examples

ISSN:0098-9886    

DOI:10.1002/cta.4490050210

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

年代:1977

数据来源: WILEY

摘要:

AbstractThe main weakness of the Yanagisawa negative‐impedance‐converter circuit is the large phase shift of its current conversion gainh21at higher frequencies. The reason for this phase shift is the collector capacitances of the two transistors. The addition is suggested here of a capacitor that balances out the effect of these capacitances as far ash21is concerned. A real and constanth21results, up to higher frequencies. Another capacitor compensates for the effect of the transistor capacitances onh22. The remaining twohparameters need no such compensation. Experimental results confirm all these conclusi

ISSN:0098-9886    

DOI:10.1002/cta.4490050211

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

年代:1977

数据来源: WILEY