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101 results on '"Gotthans, Tomas"'

1. An Extended Analytic Model for the Heating of Bondwires

Author

Duque, David, Gotthans, Tomas, Gillon, Renaud, and Schöps, Sebastian

Subjects
Computer Science - Computational Engineering, Finance, and Science, 78A30, 94C12, 80A20, B.3.4
Abstract

We present an extended analytic formula for the calculation of the temperature profile along a bondwire embedded in a package. The resulting closed formula is built by coupling the heat transfer equations of the bondwire and the surrounding moulding compound by means of auxiliary variables that stem from an \emph{ad-hoc} linearisation and mediate the wire-mould thermal interaction. The model, which corrects typical simplifications in previously introduced analytic models, is also optimised against carefully taken experimental samples representing fusing events of bondwires within real packages.

Published
2017

2. Electrothermal Simulation of Bonding Wire Degradation under Uncertain Geometries

Author

Casper, Thorben, De Gersem, Herbert, Gillon, Renaud, Gotthans, Tomas, Kratochvil, Tomas, Meuris, Peter, and Schöps, Sebastian

Subjects
Computer Science - Computational Engineering, Finance, and Science
Abstract

In this paper, electrothermal field phenomena in electronic components are considered. This coupling is tackled by multiphysical field simulations using the Finite Integration Technique (FIT). In particular, the design of bonding wires with respect to thermal degradation is investigated. Instead of resolving the wires by the computational grid, lumped element representations are introduced as point-to-point connections in the spatially distributed model. Fabrication tolerances lead to uncertainties of the wires' parameters and influence the operation and reliability of the final product. Based on geometric measurements, the resulting variability of the wire temperatures is determined using the stochastic electrothermal field-circuit model., Comment: submitted to DATE, available at http://ieeexplore.ieee.org/document/7459510/

Published
2016

4. Measurements for RF Amplifiers, Bond Wire Fusing and MOS Power Cells

Author

Kratochvil, Tomas, Petrzela, Jiri, Sotner, Roman, Drinovsky, Jiri, Gotthans, Tomas, Wieers, Aarnout, Gillon, Renaud, Reynier, Pascal, Poupin, Yannick, Bock, Hans Georg, Series Editor, de Hoog, Frank, Series Editor, Friedman, Avner, Series Editor, Gupta, Arvind, Series Editor, Nachbin, André, Series Editor, Ozawa, Tohru, Series Editor, Pulleyblank, William R., Series Editor, Rusten, Torgeir, Series Editor, Santosa, Fadil, Series Editor, Seo, Jin Keun, Series Editor, Tornberg, Anna-Karin, Series Editor, ter Maten, E. Jan W., editor, Brachtendorf, Hans-Georg, editor, Pulch, Roland, editor, Schoenmaker, Wim, editor, and De Gersem, Herbert, editor

Published
2019
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5. Ageing Models and Reliability Prediction

Author

Gillon, Renaud, Wieers, Aarnout, Deleu, Frederik, Gotthans, Tomas, Janssen, Rick, Schoenmaker, Wim, ter Maten, E. Jan W., Bock, Hans Georg, Series Editor, de Hoog, Frank, Series Editor, Friedman, Avner, Series Editor, Gupta, Arvind, Series Editor, Nachbin, André, Series Editor, Ozawa, Tohru, Series Editor, Pulleyblank, William R., Series Editor, Rusten, Torgeir, Series Editor, Santosa, Fadil, Series Editor, Seo, Jin Keun, Series Editor, Tornberg, Anna-Karin, Series Editor, ter Maten, E. Jan W., editor, Brachtendorf, Hans-Georg, editor, Pulch, Roland, editor, Schoenmaker, Wim, editor, and De Gersem, Herbert, editor

Published
2019
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6. Bond Wire Models

Author

Guerra, David J. Duque, Casper, Thorben, Schöps, Sebastian, De Gersem, Herbert, Römer, Ulrich, Gillon, Renaud, Wieers, Aarnout, Kratochvil, Tomas, Gotthans, Tomas, Meuris, Peter, Bock, Hans Georg, Series Editor, de Hoog, Frank, Series Editor, Friedman, Avner, Series Editor, Gupta, Arvind, Series Editor, Nachbin, André, Series Editor, Ozawa, Tohru, Series Editor, Pulleyblank, William R., Series Editor, Rusten, Torgeir, Series Editor, Santosa, Fadil, Series Editor, Seo, Jin Keun, Series Editor, Tornberg, Anna-Karin, Series Editor, ter Maten, E. Jan W., editor, Brachtendorf, Hans-Georg, editor, Pulch, Roland, editor, Schoenmaker, Wim, editor, and De Gersem, Herbert, editor

Published
2019
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11. Classification of Microwave Planar Filters by Deep Learning

Author

Vesely, Jiri, Olivova, Jana, Gotthans, Jakub, Gotthans, Tomas, Raida, Zbynek, Vesely, Jiri, Olivova, Jana, Gotthans, Jakub, Gotthans, Tomas, and Raida, Zbynek

Abstract

Over the last few decades, deep learning has been considered to be powerful tool in the classification tasks, and has become popular in many applications due to its capability of processing huge amount of data. This paper presents approaches for image recognition. We have applied convolutional neural networks on microwave planar filters. The first task was filter topology classification, the second task was filter order estimation. For the task a dataset was generated. As presented in the results, the created and trained neural networks are very capable of solving the selected tasks.

Published
2022

37. Experimental evaluation of digital predistortion with FBMC and OFDM signals

Author

Gotthans, Tomas, Marsalek, Roman, Pospisil, Martin, Blumenstein, Jiri, Baudoin, Geneviève, Department of Radio Electronics, BUT, Electronique, Systèmes de communication et Microsystèmes (ESYCOM), Conservatoire National des Arts et Métiers [CNAM] (CNAM), and HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Université Paris-Est Marne-la-Vallée (UPEM)-ESIEE Paris

Subjects
Engineering, Orthogonal frequency-division multiplexing, business.industry, Amplifier, Predistortion, Power (physics), [SPI.TRON]Engineering Sciences [physics]/Electronics, [SPI]Engineering Sciences [physics], Control theory, Linearization, Electronic engineering, Adjacent channel, Point (geometry), Sensitivity (control systems), business, ComputingMilieux_MISCELLANEOUS
Abstract

In this paper we would like to point out one open issue related with filtered bank multi-carrier signals (FBMC). The experiment was trying to give an answer whether the FBMC signals would keep their beneficial properties even whilst real non-linear power amplifiers were employed. As one of the merits that have been used were error vector magnitude (EVM) and adjacent channel power (ACP). Due to higher sensitivity to angle rotations the digital predistortion have been employed in order to evaluate the importance of linearization.

Published
2015
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44. Advanced methods for analyzing non-linear dynamical systems

Author

Gotthans, Tomas, STAR, ABES, Electronique, Systèmes de communication et Microsystèmes (ESYCOM), Conservatoire National des Arts et Métiers [CNAM] (CNAM), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Université Paris-Est Marne-la-Vallée (UPEM)-ESIEE Paris, Université Paris-Est, and Geneviève Baudoin

Subjects
Systèmes non-Linéaires, Dynamical systems, Exposant de Lyapunov, Pre-Distortion, Power amplifier, Lyapunov exponents, Amplificateur de puissance, Chaos, Systèmes dynamiques, Pré-Distorsion, [SPI.TRON] Engineering Sciences [physics]/Electronics, [SPI.TRON]Engineering Sciences [physics]/Electronics, Non-Linear systems
Abstract

In order to achieve better performance of modern communication devices, that have to be operated on its physical limits, the nonlinear phenomena need to be taken into the account. This thesis brings insight into two different subjects related with nonlinear dynamical phenomena. The thesis itself is divided into two parts : the first part is focused on the domain of nonlinear power amplifiers from the system point of view. Several methods for modelization and linearization of power amplifiers have been designed and discussed. A test-bench has been assembled in order to evaluate the proposed methods on real power amplifiers. Then the robustness to time misalignment in the system and the ability to deal with spectral artifacts in the system of presented methods have been evaluated. Also a theoretical study has been conducted on the existence and management of multiple solutions in the frame of adaptive indirect learning approach. The second part deals with nonlinear dynamical systems that are exhibiting chaotic solutions. Such systems are well known, but techniques for identifying reliable such solutions are either missing or are computational intense. In this thesis several methods using also parallel computing are presented. Systems with fractional differential order are briefly discussed. It is as well shown, that there exists systems related with quantified nonlinear transfer functions for which the standard analyzing methods fails, L'augmentation des performances des futurs systèmes dynamiques nécessite la prise en compte des phénomènes physiques non linéaires. Cette thèse apporte un éclairage et des contributions sur deux sujets complémentaires liés aux phénomènes dynamiques non linéaires. Le mémoire de thèse est divisé en deux parties.La première partie porte sur les non-linéarités des amplificateurs de puissance dans le cadre d'applications destinées aux télécommunications ou à la diffusion audio-visuelle. Plusieurs méthodes de modélisation et de linéarisation des amplificateurs de puissance ont été conçues et discutées. Un banc de test a été développé afin d'évaluer les méthodes sur des amplificateurs réels. La robustesse de ces techniques à un mauvais alignement temporel des signaux ainsi que leur capacité à faire face à des artefacts spectraux ont été évaluées. Par ailleurs, nous avons effectué une étude théorique sur l'existence et la prise en compte de solutions multiples dans l'approche adaptative par apprentissage indirect. La deuxième partie traite des systèmes dynamiques non linéaires qui présentent des solutions chaotiques. Ces systèmes sont bien connus, mais les techniques d'identification de ces solutions manquent de fiabilité ou nécessitent une puissance de calcul importante. Dans cette thèse, plusieurs méthodes utilisant également le calcul parallèle sont présentées. Les systèmes à commande différentielle fractionnaire sont brièvement discutés. Il est aussi montré, qu'il existe des systèmes liés à des fonctions de transfert non linéaires avec quantification pour lesquels les méthodes d'analyse classiques échouent

Published
2014

46. Design of Passive Analog Electronic Circuits Using Hybrid Modified UMDA algorithm

Author

Slezak, Josef, Gotthans, Tomas, Slezak, Josef, and Gotthans, Tomas

Abstract

Hybrid evolutionary passive analog circuits synthesis method based on modified Univariate Marginal Distribution Algorithm (UMDA) and a local search algorithm is proposed in the paper. The modification of the UMDA algorithm which allows to specify the maximum number of the nodes and the maximum number of the components of the synthesized circuit is proposed. The proposed hybrid approach efficiently reduces the number of the objective function evaluations. The modified UMDA algorithm is used for synthesis of the topology and the local search algorithm is used for determination of the parameters of the components of the designed circuit. As an example the proposed method is applied to a problem of synthesis of the fractional capacitor circuit.

Published
2015

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