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Research UniK
– University Graduate Center, NTNU
– Norwegian University of
Science and Technology, N-2027 Kjeller, Norway Tel: +47 64 84 47 47, Fax: +47 63 81 81 46, torfj@unik.no |
NTNU |
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Updated March, 2007
Device Modeling
We are developing advanced,
physics based semiconductor device models for use in circuit simulators. The
work includes models for metal-oxide-semiconductor field-effect transistors
(MOSFET), silicon-on-insulator MOSFETs (SOI/MOSFETs), metal-semiconductor FETs
(MESFETs), heterostructure FETs (HFETs), amorphous and poly-silicon thin-film
transistors (a-Si TFTs and poly-Si TFTs),wide-bandgap GaN based FETs, and most
recently, nanoscale MOSFETs. This
work provides a reliable description of short-channel phenomena, subthreshold
current, parasitic effects and capacitances of FETs, and included recipes for
automatic parameter extraction. The modeling work in part relies on the results
of extensive supercomputer simulations (see below) and new analytical
techniques used for investigating short-channel effects, including short-channel
nanoscale MOSFETs. Selected recent publications are shown here (for a complete
list, see Publications).
B. Iniguez and T.A. Fjeldly, "Unified
Substrate Current Model for MOSFETs", Solid-State Electronics, Vol.
41, No. 1, pp. 87-94 (1997).
M. Nawaz and T.A. Fjeldly, "A New
Charge Conserving Capacitance Model for GaAs MESFETs", IEEE Trans.
Electron Devices , ED-44, No. 11, pp. 1813-1821 (1997).
T.A. Fjeldly, T. Ytterdal and M. Shur, Introduction to
Device Modeling and Circuit Simulation, John Wiley & Sons,
M. Shur and T.A. Fjeldly,
"Compound–Semiconductor Field-Effect Transistors", in Modern
Semiconductor Device Physics, M. Sze, editor, John Wiley & Sons, New
York (1998).
B. Iniguez, Z. Xu,
T.A. Fjeldly, and M.S. Shur, "Unified Model for
Short-Channel Poly-Si TFTs," Solid-State
Electronics, Vol. 43, No.
11, pp. 1821-1831 (1999).
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 Trans. Electron
Devices Devices, ED- 46, No. 8, pp. 1577-1588 (1999).
R. Gaska,
M.S. Shur, T.A. Fjeldly, and A.
D. Bykovski, "Two-Channel AlGaN/GaN HFET for High Power
Applications", J. Appl. Phys., Vol. 85, No. 5, pp.
3009-3011 (1999)
J. Deng, M.S. Shur, T.A. Fjeldly, and S. Baier, "CAD Tools and Optical
Device Models for Mixed Electronic/Photonic VLSI", Int. J. High Speed Electronic Devices and Systems, Vol. 10, No. 1,
pp. 299-308 (2000)
M.S. Shur and T A. Fjeldly,
Editors, Silicon and Beyond: Advanced Circuit Simulators and Device Models,
World Scientific Publishing Co.,
T A. Fjeldly, Y. Deng, M.S. Shur,
H.P. Hjalmarson, A. Muyshondt, and T.
Ytterdal, "Modeling of Transient High Dose-Rate Ionizing Radiation Effects in
Bipolar Devices”, IEEE Trans. Nucl. Sci.,
Vol. 48, No. 5, pp. 1721-1730, Oct. (2001
H-W. Koo, K-Y. Lee, K-H. Lee,
T. A. Fjeldly, and M. S. Shur, “Analysis of the Anomalous Drain Current
Characteristics of Halo MOSFETs”, Solid-State Electronics, Vol. 47, No.
1, pp. 99-106, January (2003)
T. Ytterdal, Y. Cheng and T A. Fjeldly, Device
Modeling for Analog and RF CMOS Circuit Design, John Wiley & Sons, London, New York (2003). ISBN 0-471-49869-6
B. Iniguez, T.
Ytterdal , T. A. Fjeldly, and M. S. Shur, “Physics and
Modeling of Poly, Micro, and Nano Crystalline TFTs” in Thin Film Materials and Processes, vol. 2, Poly-Si Thin Film Transistors, Y. Kuo, Editor, Kluwer
Publishers Co., Boston (2003). ISBN 1-4020-7504
S. Kolberg, T. A. Fjeldly, and B. Iniguez,
"Self-Consistent 2D Compact Model for Nanoscale Double Gate MOSFETs
", Lecture Notes in Comp. Science, Springer, Berlin, Vol. 3994, pp.
607-614, 2006
T. A. Fjeldly, S. Kolberg,
and B. Iiniguez, "Precise 2D Compact Modeling of Nanoscale DG MOSFETs
Based on Conformal Mapping Techniques" (invited), Proc. NSTI Nanotech,
Workshop on Compact Modeling, Boston, May 7-11, 2006, v. 3, pp. 668-673, 2006
B. Iniguez, T. A. Fjeldly,
A. Lazaro, F. Danneville, and M. J. Deen, “Compact Modeling Solutions for
Double Gate and Gate-All-Around MOSFETs" Invited paper, IEEE Trans. Electron Devices, vol. 53, no.
9, pp. 2128-2142, 2006
MEMS
This work includes the
modeling and simulation of the Micro ElectroMechanical systems (MEMS). The
objective is to develop electrical equivalent circuits for sensors and actuator
parts that can be implemented in CAD design tools for Microsystems. The
following are some relevant publications:
E. R. Westby and T. A. Fjeldly, “Dynamical Equivalent-Circuit Modeling of MEMS with Squeezed Gas Film
Damping”, Physica Scripta, Vol. T101, pp. 192-195 (2002)
E. R. Westby and T. A. Fjeldly, “Nonlinear Analytical Reduced-Order Models for MEMS”, Proc. 5th
Int. Conf. on Modeling and Simulation of Microsystems, San Juan, Puerto
Rico, ISBN 0-9708275-7-1, pp. 150-153, April, 2002
E. R. Westby and T. A. Fjeldly, “Nonlinear Reduced Modeling of a Damped
Dual-axis Accelerometer”, Proc. of EuroSIME Conf., Aix-en Provence, France,
pp. 161-164, April 2003
K. Scholdberg-Henriksen, T. A. Fjeldly, J. Santander,
J. A. Plaza, and A. Hanneborg, “Modelling of Charging Effects Caused by Anodic
Bonding in Packaged MOS Devices”, Electronics Letters, Vol. 38, No. 24,
pp. 1596-1597, 21. Nov. (2002)
AIM-Spice
Co-developer of AIM-Spice,
a state-of-the art circuit simulator, which includes a new generation of
semiconductor device models based on the latest insight into device behavior.
The simulator and its models are described in a series of papers, book
chapters, and in the two books indicated below. AIM-Spice is adopted by industrial
companies and universities world-wide, in particular in
T. Ytterdal, Y. Cheng, and T A. Fjeldly, Device
Modeling for Analog and RF CMOS Circuit Design, John Wiley & Sons, London, New York (2003). ISBN 0-471-49869-6
T.A. Fjeldly, T. Ytterdal and M. Shur, Introduction to Device
Modeling and Circuit Simulation, John Wiley & Sons,
Description of a new generation of device
models ranging from simple to new, advanced models for use in circuit
simulators. The book targets senior to graduate engineering students and
practicing engineers. It comes with a description of the circuit simulator
AIM-Spice, which also is used for the numerous examples and problems in the
book.
K. Lee, M. Shur, T.A. Fjeldly and T. Ytterdal, Semiconductor
Device Modeling for VLSI, Prentice Hall,
Book for graduate students and practicing
engineers with a review of standard device models and a presentation of new
modeling concepts, such as unified FET modeling. Also includes recipes for
parameter extraction.
Lab-on-Web
We have developed a system
for interactive, on-line operation of remote education laboratory equipment,
utilizing the Internet and the World Wide Web. This allows efficient use
equipment in laboratory courses, especially for distance learning. An approach
based on a sever/client architecture implemented by means of a newly developed
software was used in combination with HP measurement equipment. The setup can
be accessed on Lab-of-Web. Se also our
remote lab site AIM-Lab at Rensselaer
Polytechnic Institute in
H. Shen, Z. Xu, B. Dalager, V. Kristiansen, Ø. Strøm, M.S. Shur, T.A.
Fjeldly, J. Lu, and T. Ytterdal, "Conducting Laboratory
Experiments over the Internet", IEEE
Trans. on Education, Vol. 42, No. 3, pp. 180-185 (1999).
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, C-H. Wei, editors, iNEER in cooperation with
Begell House Publishers (2002), pp. 135-146, ISBN 1-56700-186-6
T. A. Fjeldly and M.S. Shur, “Electronics
Laboratory Experiments Accessible via Internet” in LAB on the WEB, Running Real Electronics Experiments
via the Internet, T. A. Fjeldly and M. S. Shur, editors, John Wiley & Sons, New York, NY (2003). ISBN: 0-471-41375-5
J. Martinez, F. Gómez, T. Zimmer, M. Billaud, D. Geoffroy,
H. Effinger, W. Seifert, R. S. Jaeger,
T. A. Fjeldly, K. Jeppson, H. Mann, N. Asimopoulos, Z. German-Sallo, R.
Cabello, and I. Gonzalez, “eMerge,
a European Educational Network for Dissemination of Online Laboratory
Experiments”, in Engineering Education and Research – 2004, A Chronicle of
Worldwide Innovations, W. Aung, T. Cermak, R. King, L. M. Sanchez Ruiz,
editors, iNEER in cooperation with
Begell House Publishers (2004)
S. Kolberg and T. A. Fjeldly, “Remote Educational
Laboratory System Based on Web Services Standards”,
in Engineering Education and Research – 2005, A Chronicle of Worldwide
Innovations, W. Aung, R. King, J. Moscinski, S.-H. Ou, L. M. Sanchez Ruiz,
editors, iNEER in cooperation with
Begell House Publishers (2005).
