摘要:

AbstractHigher derivative sensitivity coefficients for a lumped linear time‐invariant networks are derived by an extension of the method used by Richards to calculate second derivative sensitivity coefficients. A computer algorithm to generate these coefficients efficiently is provided together with array space and the number of operations required at each stage. Extensions of the above approach for networks containing distributed and nonlinear elements are also discussed. Finally, time domain sensitivity results are derived and the corresponding changes in the computer algorithm indicate

ISSN:0098-9886    

DOI:10.1002/cta.4490010302

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

年代:1973

数据来源: WILEY

摘要:

AbstractIt is shown that the analysis of a network comprising passive, active, reciprocal, nonreciprocal, lumped or distributed elements and excited by voltage and current sources distributed throughout the network can be very effectively undertaken with the aid of the discrete Green's function concept if the network may be represented as a chain of sub‐networks having known two‐port parameters and if independent sources are only present at ports joining these sub‐networks.The procedure offers computational advantages when the number of sub‐networks is large and moreover, it may be applied to the solution of other problems which are described by a large system of linear equations, when the coefficients form a band

ISSN:0098-9886    

DOI:10.1002/cta.4490010303

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

年代:1973

数据来源: WILEY

摘要:

AbstractIn many applications, a network has to be solved repeatedly while certain element values are changed. The computation is reduced significantly if the network functions are generated in terms of these variable parameters explicitly. This paper presents a method of doing this which requires the solution of the network with at mostm+1 excitations when there aremvariable parameters.

ISSN:0098-9886    

DOI:10.1002/cta.4490010304

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

年代:1973

数据来源: WILEY

摘要:

AbstractPrevious methods1–4for inverting the nodal admittance matrix when the elements are rational functions of the Laplace transform variablesused pivotal techniques. Problems of numerical stability made this type of approach suitable only for quite small circuits.A new method based on diagonalizing the A‐matrix of a set of state equations defining the circuit has greatly improved stability. The state equations are derived directly from the nodal equations using a newly developed algorithm. These equations are then used to compute the inverse of the nodal admittance matrix as a matrix of rational functions ofs.An example is presented of the application of these methods to a system of 21 degrees of free

ISSN:0098-9886    

DOI:10.1002/cta.4490010305

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

年代:1973

数据来源: WILEY

摘要:

AbstractIn this paper the synthesis problem of power‐network extensions will be studied under the assumption that the loads are deterministic. The extended network satisfying conditions on the branch voltage limits will be optimized by the minimization of the network ‘first‐cost’. Useful notions such as network extension impedance and extension coefficient matrices will be introduced to describe the effect of network extensions. Two optimization methods will be presented. In the first one the cost function is linear and the constraints appear in the form of simple fractions. In the second method the cost function is assumed to be quadratic but the constraints are linear. In the latter case the extensible branches have to form a tree. It will be shown that sequential unconstrained optimization techniques can be applied in bot

ISSN:0098-9886    

DOI:10.1002/cta.4490010306

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

年代:1973

数据来源: WILEY

摘要:

AbstractThe paper contains the following new results concerning the solvability of the DC equations and the implicit integration formula of a broad class of nonlinear networks.(i)A new method of proof is given.(ii)Conditions are given for checking the unique solvability of the DC equationF(x)+Ax = bin case of monotone (not strictly monotone) and ‘steep’ characteristics and in the case when the characteristics have negative slope. Furthermore existence theorems are given under very weak conditions.(iii)In the case of a broad class of nonlinear networks sufficient conditions are presented for the unique solvability of the implicit integration formula when the characteristics are monotone or have negative slope.Some practical consequences of the theorems are also discus

ISSN:0098-9886    

DOI:10.1002/cta.4490010307

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

年代:1973

数据来源: WILEY

摘要:

AbstractCircuit models of multiconductor, longitudinally homogeneous guides having cross‐section of arbitrary geometry and filled with several different dielectric materials are investigated in the framework of the TEM and quasi‐static approach.The existence of uncoupled and orthogonal TEM modes is established providing a good approximation for multi‐conductor low‐loss lines having inhomogeneous dielectric filling. Utilizing these modes the lossyZandYmatrices are derived. The circuit models can be used for frequency‐domain analysis of lumped‐distribut

ISSN:0098-9886    

DOI:10.1002/cta.4490010308

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

年代:1973

数据来源: WILEY

摘要:

AbstractTwo different realizations are given for synthesizing a second order nonminimum phase transfer function. The first circuit uses a single operational amplifier and a passive RC bandpass building block and has the advantage of being always stable. The second configuration uses two operational amplifiers to activate a symmetrical twinT, and has the advantage of providing a unity gain factor. Sensitivities to all circuit components and the frequency limitation equations for both networks are given.

ISSN:0098-9886    

DOI:10.1002/cta.4490010309

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

年代:1973

数据来源: WILEY

摘要:

AbstractThe variations in varactor parameters which can be compensated by the electrical re‐tuning of two specific amplifiers have been studied using a digital computer. The designs of two different microstrip parametric amplifiers were at first optimized with respect to the bandwidth. Then after changing the varactor parameters, pumping and biasing conditions were optimized in order to attain maximum flat gain bandwidth within certain acceptable limits for gain and frequency. The results show that considerable variations can be compensated electricall

ISSN:0098-9886    

DOI:10.1002/cta.4490010310

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

年代:1973

数据来源: WILEY

摘要:

AbstractThe article includes two fundamental sets of relations for minimum phase digital filters; the one set defines the relations between the gain and phase components, and the other set defines the relations between the group delay and gain slope components of the pulse transfer function of the filter. Two applications of these relations are considered: (i) Graphical computation of the phase characteristic of a digital filter with a prescribed gain characteristic. (ii) Computation of the gain characteristic of a linear phase digital filter.

ISSN:0098-9886    

DOI:10.1002/cta.4490010311

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

年代:1973

数据来源: WILEY