摘要:

AbstractIt is proved that a circuit consisting of non‐linear passive resistances and of any linear invariant passive elements cannot convert power from frequencies ω1and ω2into power at frequencymω1+nω2with an efficiency better than 1/(|m| + |n|)2. Circuits attaining that efficiency are constructed for allm, n, so that the condition is both necessary and sufficient. Form = μt, n = vt, |μ| + |v|= 2s(all literals are integers), the optimal circuit consists of a finite number of rectifiers and tuned circuits. For values ofm, nthat are not of the above form an infinite number of tuned circuits is necessary, but an efficiency better than 93 per cent of the optimum is attainable by simple finite circuits in al

ISSN:0098-9886    

DOI:10.1002/cta.4490020202

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

年代:1974

数据来源: WILEY

摘要:

AbstractThe simulation of electronic circuits by computer has become an important part of present‐day circuit analysis and design, especially in the area of integrated circuit design. One of the goals in computer simulation of integrated circuits is to have a program ‘package’ for which the input consists of chip fabrication data (mask dimensions, impurity profiles, material data such as carrier lifetimes) and the output displays the complete circuit response. This requires both an efficient modelling approach and a fast circuit analysis method.In this paper a simulation method is described which generates dc responses (in the form of operating points or transfer characteristics) of transistor circuits directly from physical parameter data. The basis of the method is a two‐dimensional piecewise‐linear approach to the dc modelling of bipolar transistors. The model is directly used in a piecewise‐linear circuit analysis program to simulate the dc response of a gi

ISSN:0098-9886    

DOI:10.1002/cta.4490020203

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

年代:1974

数据来源: WILEY

摘要:

AbstractA new and practical synthesis procedure is presented for the realization of an arbitraryn × nmatrix of real rational functions of the complex frequency variable as the short‐circuit admittance matrix of a transformerless active RCn‐port network. The realization requires a theoretically minimum number of capacitorsp, wherepis the degree of the matrix, and no more than (n + p+ 1) grounded finite‐gain phase‐inverting voltage‐controlled voltage sources. All the capacitors and ports are grounded.The freedom implicit in the synthesis procedure allows the inclusion of constraints on the passive element values. Furthermore, in special cases the realization is achieved with a reduced number of conductances and voltage‐controlled voltage sources. The synthesis procedure is simple to apply and can readily be implemented on a digital computer. Several exampl

ISSN:0098-9886    

DOI:10.1002/cta.4490020204

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

年代:1974

数据来源: WILEY

摘要:

AbstractThis paper deals with an extension of the wave‐digital filter structures introduced by Fettweis.A new structure is introduced,viz, the digital translation of the Jaumann structure. The Jaumann structure is a well‐known canonical realization of analogue, symmetric, grounded lossless two‐port networks. With this structure, transfer functions with complex transmission zeros can be obtained in a wave‐digital realization, which is not possible by means of a wave‐digital ladder filter. Two examples are given, one of which has been implemented using TTL digital integrated circuits showing excellent p

ISSN:0098-9886    

DOI:10.1002/cta.4490020205

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

年代:1974

数据来源: WILEY

摘要:

AbstractThis note gives new necessary and sufficient conditions for a linear system to be passive or lossless. It will be shown that, by using the theory of operators on an indefiniteJ(t)‐Hilbert space, both the passivity and isometric conditions for an operator to be lossless can be combined into a single condition—namely an operator is lossless if and only if it isJ(t)‐contra

ISSN:0098-9886    

DOI:10.1002/cta.4490020206

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

年代:1974

数据来源: WILEY

ISSN:0098-9886    

DOI:10.1002/cta.4490020207

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

年代:1974

数据来源: WILEY

摘要:

AbstractHigh quality RC‐active filters may be realized using inductance‐simulation or FDNR‐synthesis techniques where generalized immittance converters (GIC) are the basic active two ports of the synthesis. The deterioration of the magnitude transfer function |T(jω)| at high frequencies is determined in terms of the gain bandwidth productsBof the operational amplifiers employed within the GIC's. The basis of the method is to extend Blostein's lossless LC‐twoport tolerance by determining the magnitude and phase errors of the simulated‐inductance or FDN

ISSN:0098-9886    

DOI:10.1002/cta.4490020208

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

年代:1974

数据来源: WILEY

摘要:

AbstractFrom a given composite graph two graphs are derived, which can be interpreted as current and voltage graphs, respectively. It is shown that a complete tree of both graphs is a directed tree of the composite graph. Thus the generation of directed trees is reduced to the generation of complete trees. The matrix belonging to the composite graph is decomposed in the incidence matrices of the current and voltage graphs and in a diagonal matrix whose elements are given by the edge‐weights of the composite graph. The number of directed trees in a composite graph is determined using the incidence matrices of both graph

ISSN:0098-9886    

DOI:10.1002/cta.4490020209

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

年代:1974

数据来源: WILEY

摘要:

AbstractSymmetric wave digital filters derived from reference filters in lattice configuration require, in general, fewer multipliers. They can be designed with excellent pass‐band sensitivity properties. Their theory is easily established by using results from the scattering parameter theory of classical symmetric filters. Numerical results obtained by computer simulation are presente

ISSN:0098-9886    

DOI:10.1002/cta.4490020210

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

年代:1974

数据来源: WILEY

ISSN:0098-9886    

DOI:10.1002/cta.4490020211

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

年代:1974

数据来源: WILEY