Monday Tutorials

Tutorial 1

3D Smith chart high frequency circuits design

Andrei A. Muller, Swiss Federal Institute of Technology in Lausanne

The talk will start by presenting the mathematics behind the Smith chart and extended 2D Smith chart from the group theory of geometry point of view (Kleinian view of geometry). Using the Maxime Bochert-Klein results on Mobius transformations (among which the Smith chart constitutive equation belongs). The introduction will show what happens by applying the voltage reflection coefficient transformation and power wave reflection coefficient transformation on the grid of the impedance plane, random geometrical objects and photos. The geometry of these mappings will be then compared with the geometry of other scattering parameters mappings when applied to the same objects and the need of the Riemann sphere visualization when dealing with reflection coefficients will be introduced naturally.

The tutorial will then continue with the 3D Smith chart construction and basic properties description. Further based on the 3D Smith chart tool, a hands-on demonstration on how the Smith chart and 3D Smith chart can be used in matching networks design will be comparatively showed. Additional the tutorial will present the use of the 3D Smith chart tool in the design of amplifiers, oscillators, microwave filters, where the single use of a 2D Smith chart cannot suffice (stability circles, transducer power gains and negative& positive group delay analysis will be highlighted on it).

Last, it will show the new usage of the3D Smith chart in the design, analysis, modelling and synthesis of high frequency circuits using smart materials by exploiting in an original way the topology of the chart.

Andrei A. Muller

Andrei A. Muller received a M.Sc degree in Mobile and Satellite Communications in 2005 and another one in Microsystems in 2007 while completing a PhD in microwave engineering (A Microwave design theory based on the Kleinian view of Geometry) from the Politehnica University of Bucharest in Dec. 2011. Andrei completed during his PhD various stages (more than 2 years) at Technische Univ. Munchen, Germany, Carl- Emily Fuchs Institute, Pretoria, (South Africa) and in the Pure an Applied Maths Institute of PolitehnicaValencia-Spain. Andrei did a Post-Doc in microwave filter design (2012) at Labsticc (CNRS research center) in Brest/ France and completed a 4 years Post-Doc, Marie Curie Integration Grant (awarded by the European Commission) in the Telecommunication Institute (i-team) / Valencia/ Spain in SIW filter tunning (2013-2017).

Andrei received the Gheorghe Cartianu award (2013) from the Romanian Academy of Science for the 3D Smith chart concept article “A 3D Smith chart based on the Riemann Sphere for Active and Passive Microwave Circuits” published in IEEE Microwave and Wireless Letters. In 2018 he obtained the Outstanding Associate Editor award of the IEEE Access Journal for the year 2017.

Andrei gave 10 invited talks in Europe and USA about the 3D Smith chart concept and launched the first 3D Smith chart tool in May 2017. The tool has various users from academia from around the world, http://www.3dsmithchart.com/#testimonials. Besides, he authored or co-authored more than 40 articles in journals and conferences.

Since September 2017 Andrei is a Scientist in the Nanolab, Swiss Federal Institute of Technology in Lausanne (EPFL) working on Vanadium Oxide devices design& fabrication for microwave frequency applications in the frame of the Phase-Change Switch FET-Open H2020 project lead by Prof. Adrian Ionescu.


Tutorial 2

Bio-Inspired Micro&Nano Electronic Systems for Robotics and Biomedical Applications

D. Demarchi, Department of Electronics and Telecommunications (DET), Politecnico di Torino, Italy & EPFL Visiting Professor

Applications are demanding new approaches to electronic systems. The concept of running for obtaining the best performances in terms of speed and dimensions, that drove the electronic design in the last decades, is no more valid. The electronic systems are nowadays applied in very much different scenarios where sometimes it is not at all important the speed, but power consumption and reliability are the keys. It is strategic to find new approaches that must have an impact at system level, not on the single parts only, but on the global structure: the optimization is done as consequence of the choices related to how the single devices are working, associated to how they interact each other and they transmit the information. The two levels (system and device) are strictly related, and design choices have to be done looking at the system as a global entity to be optimised.

Danilo Demarchi

For optimising the aforementioned aspects, it is strategic the choice of the system level paradigm that will drive all the design choices. For these reasons, it is strategic to take inspiration from the biological systems, applying a merge of the techniques born in recent years and exploiting them for reaching the best tradeoff between quality, and so performances, and power consumption [1]. In the lecture will be analysed solutions related to what is named Bio-Inspired Electronics, for applying biological paradigms in system optimisation.

As first consequence, it is possible to implement systems that work with digital signals, bringing an analog information, no more based on amplitude or bits, but on a time-based approach, as reported for specific applications in [2] and [3].

Tutorial Syllabus

  • The Bio-Inspired Concept
  • Neuromorphic and Quasi-Digital, the paradigms
  • Application examples
    • EMG signals and Gait Analysis
    • Robotics
  • Implementation in Microelectronics
    • The Micro for Nano (M4N) approach
    • ReadOut Circuits
    • Wireless Communications

[1] Alioto M., Designing (Relatively) Reliable Systems with (Highly) Unreliable Components, NewCAS 2016, Vancouver, Canada
[2] Motto Ros P., Crepaldi M., Bartolozzi C., Demarchi D., A hybrid quasi-digital/neuromorphic architecture for tactile sensing in humanoid robots, Proceedings of 6th IEEE International Workshop on Advances in Sensors and Interfaces (IWASI), 126--130, 2015
[3] Sapienza S., Crepaldi C., Motto Ros P., Bonanno A., Demarchi D., On Integration and Validation of a Very Low Complexity ATC UWB System for Muscle Force Transmission, IEEE Transactions on Biomedical Circuits and Systems, 10:2, 497--506, 2016

Danilo Demarchi

Prof. Danilo Demarchi received the Engineering Degree and the Ph.D. in Electronics Engineering from Politecnico di Torino, Italy, in 1991 and 1995, respectively. Full position as Associate Professor at Politecnico di Torino, Department of Electronics and Telecommunications, with the tenures of “Bio-Micro&Nano Systems” for Biomedical and Electronics Engineering, of “CAD for Microsystems” for Electronics Engineering and Nanotechnologies for ICT, of “Bio-NanoElectronics” for the PhD School in Electronics and Telecommunications and of "Electronics" for the Bachelor Degree in Biomedical Engineering.

International Tenures as Lecturer at EPFL Lausanne for the course "Nanocomputing", Biomolecular computing module, at the Electrical Engineering PhD School, and Adjunct Professor of "Electronic Systems" at Tongji University Shanghai, PoliTong Master Degree. Associate Faculty at the University of Illinois at Chicago, Department of Electrical and Computer Engineering.

Main interests are micro and nano electronic systems for biomedical applications and robotics. Author and co-author of 3 patents and more than 200 scientific publications in international journals and peer-reviewed conference proceedings.

Currently leading the MiNES (Micro&Nano Electronic Systems) Laboratory of Politecnico di Torino and coordinating the Italian Institute of Technology Microelectronics group at Politecnico di Torino (IIT@DET). Coordinator or Partner of many European Projects in FP6, FP7, Horizon2020, Tempus, Leonardo and Erasmus+.

He is Senior Member of IEEE, Member of the BioCAS Technical Committee, Associate Editor of the Transactions on Biomedical Circuits and Systems (TBioCAS), Associate Editor of IEEE Sensors and of the Springer Journal BioNanoScience. General Chair of BioCAS (Biomedical Circuits and Systems) Conference edition in Torino, October 2017.


Tutorial 3

The concept of Inversion coefficient in Multigate FETs

Jean-Michel Sallese, EPFL in Lausanne

The aim of the tutorial is to introduce the concept of inversion coefficient to simulate the DC and RF characteristics of a variety of field effect transistors.

We start by explaining how the concept of the inversion coefficient is introduced in bulk MOSFETs and how this approach leads to simple and highly normalized expressions to simulate DC and AC characteristics in all the regions of operation.

Next, we discuss how this concept can be transposed to simulate multigate architectures (MUGFETs) such as nanowires, double gate FETs, FinFETs, arbitrary channel’s FET geometries, including the high electron mobility field effect transistor (HEMT).

Ultimately, further normalizations of the frequency and gate transconductance are introduced which lead to a fully normalized non-quasi static model valid at very high frequency (small signal). In particular, we will illustrate how this approach has been validated up to 110 GHz in a 28 nm UTBBSOI technology (Ultra-Thin Body and Box fully depleted Silicon-on-Insulator, ST Micro).

Jean-Michel Sallese

Jean-Michel Sallese received the PhD in physics from the University of Nice-Sophia Antipolis/CNRS (France) before joining the physics department of the Ecole Polytechnique Fédérale de Lausanne where he worked on III-V semiconductors, with a special focus on semiconductor lasers. He is currently senior scientist at the Electrical Department of EPFL conducting research on modeling and simulation of field effect semiconductor devices. He is co-author of two books and of more than 150 publications.

Thursday Tutorials

Tutorial 4

Challenges in Modeling and Simulation of Inertial MEMS

Prof. Dr.-Ing. habil. Jan Mehner, Chemnitz University of Technology, Germany

The performance and cost-effectiveness of microsystems is already strongly determined during the design phase. MEMS, which are widely utilized for inertial sensors, consist of complicated shape elements with strong interactions between mechanical, electrostatic, thermal, and fluidic domains. Models at various abstraction levels are essential for dimensional design and optimization of transducer cells, to capture the impact of manufacturing tolerances, to evaluate packaging interactions and for reliability analyses. For system design, transducer models need to be seamlessly integrated into electronic design environments such as Matlab/Simulink or Verilog-A to simulate interactions with electronic circuits and control units. The tutorial focuses on modeling requirements, the latest design flow for MEMS products, and discusses challenges of modeling and simulation on examples.

Jan Mehner

Prof. Jan Mehner received the Diploma and the Dr.-Ing. degree in electrical engineering and information technology from the Chemnitz University of Technology (Germany) in 1989 and 1994, respectively. From 1998 to 1999 he was a visiting scientist in the MEMS design group of Prof. Senturia at the Massachusetts Institute of Technology (MIT, USA).

Jan Mehner is Professor for Microsystems and Biomedical Engineering at the Chemnitz University of Technology. His research interests include analytical and numerical methods for microsystems design, design automation, model order reduction and computational algorithms for coupled field analysis as well as model export to different design environments. Jan Mehner is founder of the i-ROM GmbH. The company develops and distributes design software used for efficient modelling and simulation of MEMS products.