Stefano Grivet Talocia

Professore Ordinario (L.240)
Dipartimento di Elettronica e Telecomunicazioni (DET)

  • Coordinatore Collegio di Dottorato INGEGNERIA ELETTRICA, ELETTRONICA E DELLE COMUNICAZIONI
  • Componente Centro Interdipartimentale SmartData@PoliTO - Big Data and Data Science Laboratory
  • Componente Presidio di Qualità di Ateneo
  • Componente Steering Board per visita ANVUR

Profilo

Interessi di ricerca

Behavioral modeling
Electromagnetic compatibility
Macromodeling
Model order reduction
Numerical modeling
Passivity
Power integrity
Signal integrity
Transmission lines
Wavelets

Biografia

Stefano Grivet-Talocia ha conseguito la laurea (110 e lode) in ingegneria elettronica (1994) e il dottorato in ingegneria elettronica e delle comunicazioni (1998) presso il Politecnico di Torino. Dal 1994 al 1996, ha lavorato presso NASA/Goddard Space Flight Center, Greenbelt, MD, USA. Attualmente è professore ordinario di Elettrotecnica presso il Politecnico di Torino. Stefano Grivet-Talocia è autore o coautore di oltre 200 pubblicazioni internazionali con referee, tra cui 74 articoli su rivista internazionale (singolo autore di 12) e una monografia di ricerca (il primo libro pubblicato su "Passive Macromodeling"). Ha tenuto diversi seminari, corsi e tutorial presso congressi internazionali e istituzioni pubbliche o private, tra cui NOAA, NASA, EADS, INTEL, IBM, MIT. I suoi attuali interessi di ricerca comprendono la macro-modellazione passiva di strutture di interconnessione concentrate e distribuite per Signal/Power Integrity, tecniche di riduzione d'ordine, modellistica e simulazione di campi, circuiti e loro interazioni, wavelet, trasformazioni tempo-frequenza e relative applicazioni. Stefano Grivet-Talocia è stato Associate Editor per le IEEE Trans. EMC (1999-2001) ed è Associate Editor per le IEEE Trans. CPMT (dal 2016). E' stato General Chair delle conferenze SPI2016 e SPI2017. È stato membro dei TPC di numerose conferenze internazionali, tra cui DATE, ICCAD, SPI, EPEPS. È IEEE Fellow e membro della Giunta del Gruppo Nazionale di Elettrotecnica (ET). Ha ricevuto numerosi premi, tra cui tre IBM SUR Grant Awards consecutivi (2007-2009), un Best IEEE Transactions Paper Award, vari Best Conference Paper Awards e due URSI Young Scientist Awards. È attivamente impegnato in diverse attività di trasferimento tecnologico. Oltre a vari contratti di ricerca con partner industriali (tra cui NOKIA, HITACHI, INTEL, IBM), è stato co-fondatore (2007) e presidente della società Spin-off denominata IdemWorks, fino all'acquisizione da parte di CST AG nel 2016.

Settore scientifico discliplinare

ING-IND/31 - ELETTROTECNICA
(Area 0009 - Ingegneria industriale e dell'informazione)

Linee di ricerca

  • Fast simulation of transmission lines. S. G.-T. is the main developer of the Generalized Method of Characteristics technique denoted as TOPLine for the fast transient simulation of multiconductor transmission lines with frequency-dependent parameters. The technique is based on delay extraction and rational approximations of suitable transfer functions. TOPLine was demonstrated to outperform more traditional modeling and simulation schemes with no loss of accuracy. TOPLine is now embedded in some proprietary circuit solvers such as IBM PowerSPICE.
  • Macromodeling and Model Order Reduction. The term “Macromodeling” denotes methods and algorithms for the generation of black-box models or equivalent circuits starting from some “external” characterization of a given structure at few accessible “ports” or observation points. These characterizations can be in time or frequency domain, coming from either simulation (e.g., by solving first-principles models such as field equations) or direct measurements. The resulting macromodels are essential for design and verification flows via system-level simulations. Macromodeling techniques have been mainly finalized to Electromagnetic Compatibility and Signal/Power Integrity verification of complex electronic systems. Several extensions and generalizations have been developed, including distributed-parameter circuits and parameterized (multivariate) macromodeling. S. G.-T. is considered as a leading personality in this field. In particular, He has co-authored the first book entirely dedicated to Macromodeling, published in 2016.
  • Methods for simulation of fields and circuits. This research activity provides a complementary approach to the mainstream macromodeling approach by the Author. The main objective is indeed the reduction of the computing time that is required by conventional simulation techniques for the numerical solution of differential problems, still preserving the possibility of accessing unknowns or variables that are inside the structure of interest. S. G.-T. is the main developer of a hybridization scheme of full-wave Finite-Difference Time-Domain solvers with behavioral models of digital drivers and receivers. Main theory includes a stability analysis for guaranteeing convergence of the simulation. This technique allows modeling and simulation of Electromagnetic Interference on interconnected structures, including the effects of nonlinear and dynamic terminations.
  • Passivity of lumped macromodels. The publications by the Author on passivity enforcement are considered as a reference for the scientific community. Non-passive macromodels can be the root cause for instabilities and lack of convergence in system-level simulations. Explicit passivity enforcement is thus of paramount importance during model generation. Several particularly effective scheme for achieving this goal have been introduced by S. G.-T., in particular the class of methods based on the iterative perturbation of the eigenvalue spectrum of suitable Hamiltonian matrices associated to the macromodels. Since its introduction in 2003, the main algorithm has been introduced in some leading commercial CAD software tools. Later developments extended the applicability of this methodology to highly complex models, both in terms of dynamic order and port count. The reliability of these schemes has been successively improved by introducing advanced techniques for accuracy control based on frequency-selective weighting, and by introducing additional formulations suitable for reciprocal structures and/or based on optimal convex (non-smooth) constraints.
  • Waveform Relaxation. S. G.-T. is the main developer of several numerical schemes based on distributed macromodels and Waveform Relaxation for fast transient analysis of complex high-speed channels terminated by nonlinear drivers and receivers. These algorithms outperform standard circuit solvers of the SPICE class and provide a comprehensive framework for Signal Integrity verification.
  • Wavelets and applications. It is well known that wavelet transforms allow optimal characterization of data, functions and operators via adaptive representations. This fact has been exploited by S. G.-T. by contributing both to theoretical and application-oriented aspects. The former include a particularly effective construction of wavelets on bounded domains preserving regularity, approximation order, stability, and spatial localization of the border functions. The investigated applications include (space-time) adaptive solution of fields and circuits, and adaptive signal processing. In particular, the latter studies were performed during a two-year research period at NASA/Goddard Space Flight Center. The wavelet transform was been applied to the problem of non-linear adaptive filtering of signals. In particular, the intrinsic time-frequency decomposition properties in the wavelet domain led to the construction of intelligent schemes for the detection and extraction of coherent (nonlinear) wave phenomena from vector time series obtained from concurrent measurements. The main tool is a partial inversion of the wavelet transform over an integration domain in the time-frequency plane that is dynamically configured based on the features of the signals. This technique has been applied to the study of atmospheric gravity waves, leading to a systematic analysis of the occurrence of such phenomena, including relevant statistics. This methodology is currently in use at NASA and NOAA labs for the automated identification of high-energy atmospheric wave phenomena.
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Competenze

Settori ERC

PE7_4 - (Micro and nano) systems engineering
PE7_6 - Communication technology, high-frequency technology
PE7_2 - Electrical engineering: power components and/or systems
PE7_3 - Simulation engineering and modelling

Premi e riconoscimenti

  • Best Associate Editor Award - IEEE Transactions on Components, Packaging and Manufacturing Technology conferito da IEEE Electronic Packaging Society, Italia (2020)
  • Best Conference Paper Award conferito da 2020 IEEE 29th Conference on Electrical Performance of Electronic Packaging and Systems (EPEPS), San Jose (CA) USA, Stati Uniti (2020)
  • IBM Shared University Research Award conferito da IBM, Stati Uniti (2009)
  • IBM Shared University Research Award conferito da IBM, Stati Uniti (2008)
  • Best EPEP conference paper award conferito da IEEE 17th Electrical Performance of Electronic Packaging Conference, Stati Uniti (2008)
  • IBM Shared University Research Award conferito da IBM, Stati Uniti (2007)
  • Best EPEP conference paper award conferito da IEEE 17th Electrical Performance of Electronic Packaging Conference, Stati Uniti (2007)
  • IEEE Transactions on Advanced Packaging Best Paper Award conferito da IEEE Components, Packaging and Manufacturing Technology Society, Stati Uniti (2007)
  • Best symposium paper conferito da 17th International Zurich Symposium on Electromagnetic Compatibility, Singapore (2006)
  • URSI Young Scientist Award conferito da International Union of Radio Science, Belgio (1999)
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Partecipazioni scientifiche

Comitati editoriali

  • IEEE TRANSACTIONS ON COMPONENTS, PACKAGING AND MANUFACTURING TECHNOLOGY. PART C. MANUFACTURING (2018-), Associate Editor di rivista o collana editoriale
  • IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY (1999-2001), Associate Editor di rivista o collana editoriale

Congressi

  • 21st IEEE Workshop on Signal and Power Integrity (SPI), Program chair (presidente/responsabile del comitato scientifico)
  • 20th IEEE Workshop on Signal and Power Integrity (SPI), Program chair (presidente/responsabile del comitato scientifico)

Didattica

Collegi di Dottorato

  • INGEGNERIA ELETTRICA, ELETTRONICA E DELLE COMUNICAZIONI, 2022/2023 (39. ciclo)
    Politecnico di TORINO
  • INGEGNERIA ELETTRICA, ELETTRONICA E DELLE COMUNICAZIONI, 2021/2022 (38. ciclo)
    Politecnico di TORINO
  • INGEGNERIA ELETTRICA, ELETTRONICA E DELLE COMUNICAZIONI, 2020/2021 (37. ciclo)
    Politecnico di TORINO
  • INGEGNERIA ELETTRICA, ELETTRONICA E DELLE COMUNICAZIONI, 2019/2020 (36. ciclo)
    Politecnico di TORINO
  • INGEGNERIA ELETTRICA, ELETTRONICA E DELLE COMUNICAZIONI, 2018/2019 (35. ciclo)
    Politecnico di TORINO
  • INGEGNERIA ELETTRICA, ELETTRONICA E DELLE COMUNICAZIONI, 2017/2018 (34. ciclo)
    Politecnico di TORINO
  • INGEGNERIA ELETTRICA, ELETTRONICA E DELLE COMUNICAZIONI, 2016/2017 (33. ciclo)
    Politecnico di TORINO
  • INGEGNERIA ELETTRICA, ELETTRONICA E DELLE COMUNICAZIONI, 2015/2016 (32. ciclo)
    Politecnico di TORINO
  • INGEGNERIA ELETTRICA, ELETTRONICA E DELLE COMUNICAZIONI, 2014/2015 (31. ciclo)
    Politecnico di TORINO
  • INGEGNERIA ELETTRICA, ELETTRONICA E DELLE COMUNICAZIONI, 2013/2014 (30. ciclo)
    Politecnico di TORINO
  • INGEGNERIA ELETTRONICA, 2012/2013 (29. ciclo)
    Politecnico di TORINO
  • INGEGNERIA ELETTRONICA E DELLE COMUNICAZIONI, 2004/2005 (21. ciclo)
    Politecnico di TORINO
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Corso di laurea magistrale

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Corso di laurea di 1° livello

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Altre attività e progetti di didattica

S. G.-T. is the main author, developer, and maintainer of the web service autoCircuits (www.autocircuits.org): The first web service for the automated generation of circuit problems. Simple or difficult, numeric or symbolic, the user can build fully customized circuit theory exercises, with solution.

For students: the autoCircuits enables practicing on a virtually infinite number of circuit analysis problems, always different and generated on-demand in real time.

For instructors: autoCircuits can be used to generate exam templates. Thanks to the parameterization of the back-end algorithms, all circuit problems generated with the same control options will be consistent.

The autoCircuits service is regularly used in several Circuit Theory courses at Politecnico di Torino, at national and international universities.

Ricerca

Ambiti di ricerca

Gruppi di ricerca

Laboratori

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Progetti finanziati da bandi competitivi

Progetti finanziati da contratti commerciali

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