A general interface between TLM models and lumped element circuit models

Russer, P.; Isele, B.; Sobhy, Mohammed; Hosny, E.A.

doi:10.1109/mwsym.1994.335214

Cited by 9 publications

(6 citation statements)

References 5 publications

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“…The general interface technique introduced in [6] is used for field excitation as well as the extraction of currents and voltages at the ports. Then we apply system identification methods for the generation of compact circuit models for the distributed sub-circuits.…”

Section: Theorymentioning

confidence: 99%

Modelling of microwave circuits by system identification methods

Sobhy

Bakkar

et al. 1995

25th European Microwave Conference, 1995

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Microwave circuits containing lumped as well as distributed sub-circuits are investigated by a method combining circuit simulation with system identification models. The signal transmission behaviour of the distributed sub-circuits is computed in the time domain using the transmission line matrix (TLM) method. Applying system identification methods to the TLM results compact circuit models are generated. By this way efficient circuit simulation is achieved. I IntroductionIn this paper microwave circuits are investigated by combining the TLM method with system identification. In many cases microwave circuits can be separated into linear distributed sub circuits and lumped subcircuits containing linear and nonlinear elements, active devices and input sources. The linear distributed subcircuits are modelled field-theoretically whereas network-oriented methods are applied to the lumped element sub-circuits. We use the TLM method for the simulation of the distributed sub-circuits. System identification methods have emerged as a powerful tool in recent years [1][2][3][4][5]. Prony's method allows to match a deterministic model of the circuit to the data obtained by electromagnetic field simulation [1]. Mostly it has been used in combination with full-wave analysis for reducing the computational effort in time domain analysis [2][3][4]. Time domain circuit simulation of complex distributed circuits may exhaust the available computing resources. In this case time domain diakoptics allows to subdivide the task of circuit modelling. However time domain diakoptics still needs large computer storage for the time responses and considerable computing time, especially if the circuits contain sub-circuits exhibiting long time responses. Prony's method may also be used to determine the poles for the generation of canonical equivalent circuit models [7,8]. However, in general it is difficult to find lumped equivalent circuit models for distributed subcircuits. In our approach we introduce a mathematical model based on the residues and poles description of the time responses obtained by system identification methods from TLM data. By this way efficient circui simulation is enabled avoiding the conventional convolution approach and the results of time consuming field analysis are made easily accessible for network analysis. TheoryIn the first step the distributed sub-circuits are characterized by time responses obtained by TLM method. The general interface technique introduced in [6] is used for field excitation as well as the extraction of currents and voltages at the ports. Then we apply system identification methods for the generation of compact circuit models for the distributed sub-circuits. Prony's method attempts the approximation of a time series x(n) by a linear superposition of complex exponentials.The extended Prony's method utilizes two leastsquares steps with two data sets of the length N for determination of the complex parameters Zk and hk [21. This method limits also the number of poles to half of the total number 2N...

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Section: Theorymentioning

confidence: 99%

Modelling of microwave circuits by system identification methods

Sobhy

Bakkar

et al. 1995

25th European Microwave Conference, 1995

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“…To overcome this problem, many methods based on co-modeling have been proposed to design complex RF components, circuits and modules containing passive and/or active domains [1][2][3][4][5][6][7][8][9][10][11][12]. Numerical electromagnetic methods developed in the spectral or time domain are coupled to physical and/or circuit methods for hybrid modeling of complex structures.…”

Section: Introductionmentioning

confidence: 99%

“…Their electrical behaviors are described by Kirchoff laws and are modeled by equivalent lumped element circuits or measurements. Lumped accesses [6,7] placed inside the meshed volume allow the connection between the distributed passive part and the localized domain. Using this technique, it is possible to consider both the MMICs behaviors, the EM packaging and/or parasitic coupling effects.…”

Section: Introductionmentioning

confidence: 99%

An EM-circuit-ANN co-modeling approach for RF module design

Zoghbi

Baillargeat

Bila

et al. 2007

Int J RF and Microwave Comp Aid Eng

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A new co-modeling technique dedicated to RF module design and optimization is described. This approach is based on combined EM, circuit, and artificial neural network simulations. Generic segments are parameterized in geometry, physical properties and frequency by analytical models and are integrated into commercial circuit software. This comodeling combines speed and flexibility of circuit simulators and accuracy of EM-based simulators.

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“…Full-wave analysis methods used for the modeling of distributed parts have to be combined with lumped subcircuits. One possible way is to directly integrate lumped elements into a full-wave analysis [1]- [3], but it is advantageous to separate EM and network simulation combining the single simulation results afterwards [4]. This procedure reduces the modeling effort and increase efficiency.…”

Section: Introductionmentioning

confidence: 99%

Full-wave modeling and automatic equivalent-circuit generation of millimeter-wave planar and multilayer structures

Mangold

Russer

1999

IEEE Trans. Microwave Theory Techn.

Self Cite

102

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A general method for the automated extraction of lumped-element equivalent circuits for linear passive reciprocal distributed microwave circuits from time-domain scattering signals is presented. The proposed method autonomously generates network topology as well as parameter values while preserving circuit properties like reciprocity and passivity. Modeling examples for a two-and three-port structure are given.

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A general interface between TLM models and lumped element circuit models

Cited by 9 publications

References 5 publications

Modelling of microwave circuits by system identification methods

Modelling of microwave circuits by system identification methods

An EM-circuit-ANN co-modeling approach for RF module design

Full-wave modeling and automatic equivalent-circuit generation of millimeter-wave planar and multilayer structures

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