Tor Fjeldly (visiting professor from Norwegian University of Science and Technology)
— Professor of Electronics
University Graduate Center, Norwegian University of Science and Technology (NTNU)

— Ph.D., Physics, Brown University, 1972
— M.S., Physics, Norwegian University of Science and Technology, 1967

Career Highlights:
Fjeldly began his professional career in 1971 as a scientist at the Max-Planck-Institute for Solid State Physics in Stuttgart, Germany. After spending three years there, he joined the staff of ELAB-SINTEF in Trondheim, Norway, as a senior scientist. In 1983, he became a member of the Norwegian University of Science and Technology in Trondheim. He was named a full professor in 1986. Fjeldly was a visiting scientist in the University of Minnesota's Department of Electrical Engineering Minneapolis for the summers of 1988 and 1989 and visiting professor at the University of Virginia's Department of Electrical Engineering from 1990 through 1996. He has been a visiting professor for Rensselaer's Electrical, Computer, and Systems Engineering Department since 1997. He joined the UniK-University Graduate Center at Kjeller in Norway in 1998 and has also been an adjunct professor since 2002 at Oslo University in the Department of Informatics.

At NTNU, he has held administrative roles such as department head of physical electronics from 1986 to 1987 and 1989 to 1993 as well as associate dean of the faculty of electrical engineering and computer science from 1989 to 1990.

Fjeldly was elected as a member of the Norwegian Academy of Technical Sciences, and is a Fellow of the Institute of Electrical and Electronics Engineers (IEEE). He is also the co-author of two patents and the author and co-author of about 200 scientific and technical publications, including 160 in international scientific journals and conference proceedings. He is also the co-author of three books and ten chapters and co-editor of four books and two conference proceedings. Fjeldly is co-editor-in-chief of the International Journal of High Speed Electronics and Systems and co-editor of Selected Topics in Electronics and Systems, a book series.

Research Areas:
Fjeldly's research interests include device modeling and circuit simulation, electronic-photonic circuits, charge transport phenomena, and microelectromechanical systems (MEMs). He is also working with an experimental remote Internet lab.

His device modeling and circuit simulation research emphasizes physics-based device modeling for applications in circuit simulators, such as the Simulation Program for Integrated Circuits Emphasis (SPICE). He is using a unified charge channel approach, with inclusion of important non-ideal effects related to reduced dimensions and high fields. Most of today's relevant technologies are covered, including CMOS, SOI-CMOS, Si thin-film transistors (a-Si TFTs and poly-Si TFTs), GaAs FETs, and GaN-technology. Almost all of the models considered have been implemented in AIM-Spice, a circuit simulator program Fjeldly co-developed.

His electronic-photonic circuits research is of direct relevance for System-on-Chip technology, with multi-signal/multi-technology emphasis. The long-term objective is to develop computer-assisted design (CAD) tools for handling such technologies. Studies of radiation-effects on circuits relate to cosmic radiation photoeffects and damage in space electronics, and also concern solar cell issues.

Fjeldly's charge transport phenomena research involves fundamental transport phenomena of relevance to both present and future generations of semiconductor devices, including aggressively downscaled devices where non-stationary and quantum phenomena manifest themselves.

His involvement with MEMs includes some previous work on integrated, solid-state chemical sensors. He and his researchers have begun modeling mechanical and other sensors/actuators in terms of electrical equivalent circuits, for easy integration into established ASIC CAD tools.

Fjeldly's work also involves the development of remotely operated laboratory modules that use advanced Internet and Web technology. He hopes to make such modules available as part of a remote engineering education strategy and for use in studio and classroom settings. Systems are based on TCP/IP and Java Applets, LabVIEW, and ActiveX technology (ISAPI or COM+ solutions). The site is available at

Selected Publications:
T. Ytterdal, Y. Cheng, and T.A. Fjeldly, Device Modeling for Analog and RF CMOS Circuit Design, John Wiley & Sons, London, New York, (2003).

T.A. Fjeldly, J.O. Strandman, R. Berntzen, and M.S. Shur, "Advanced Solutions for Performing Laboratory Experiments over the Internet," in Engineering Education and Research - 2001, A Chronicle of Worldwide Innovations, W. Aung, P. Hicks, L. Scavarda, V. Roubicek, and C.-H. Wei, eds., iNEER in cooperation with Begell House Publishers, 135-146, (2002).

T.A. Fjeldly, Y. Deng, M.S. Shur, H.P Hjalmason, A. Muyshondt, and T. Ytterdal, "Modeling of Transient High Dose-Rate Ionizing Radiation Effects in Bipolar Devices," IEEE Transactions on Nuclear Science, 43, (5), (Oct. 2001).

J. Deng, M.S. Shur, T.A. Fjeldly, and S. Baier, "CAD Tools and Optical Device Models for Mixed Electronic/Photonic VLSI," International Journal of High Speed Electronic Devices and Systems, 10, (1), 299-308, (2000).

L. Wang, T.A. Fjeldly, B. Iniguez, H. Slade, and M.S. Shur, "Self-Heating and Kink Effects in a-Si:H Thin Film Transistors," IEEE Transactions on Electron Devices, 47, 387-397, (2000).

T. Ytterdal, T.A. Fjeldly, M.S. Shur, S. Baier, and L. Lucero, "Enhanced Heterostructure Field Effect Transistor Model Suitable for Simulation of Mixed Mode Circuits," IEEE Transactions on Electron Devices, 46, 1577-1588, (1999).

T.A. Fjeldly, T. Ytterdal, and M. Shur, Introduction to Device Modeling and Circuit Simulation, John Wiley & Sons, New York, (1998).

M. Shur and T.A. Fjeldly, "Compound-Semiconductor Field-Effect Transistors," in Modern Semiconductor Device Physics, S.M. Sze, Editor, John Wiley & Sons, New York, (1998).

B. Iñiguéz and T.A. Fjeldly, "Unified Substrate Current Model for MOSFETs," Solid-State Electronics, 41, (1), 87-94, (1997).

Y. Cheng and T.A. Fjeldly, "Unified Physical I-V Model Including Self-Heating Effect for Fully Depleted SOI/MOSFETs", IEEE Transactions on Electron Devices, 43, 1291-1296, (1996).

T.A. Fjeldly and M. S. Shur, "Threshold Voltage Modeling and the Subthreshhold Regime of Operation of Short-Channel MOSFETs," IEEE Transactions on Electron Devices, 40, 137-145, (1993).

Contact Information:
Tor Fjeldly
UniK - Norwegian University of Science and Technology
N-2027 Kjeller, Norway

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