94 publications
22 papers
M-L. Junttila, B. Ståhlberg, E. Kyrö, T. Veijola, and J. Kauppinen, “Fourier Transform Wavemeter,” Rev. Sci. Instrum. , vol., 58, no 7, pp 418-423, July 1987.
T. Veijola and M. Valtonen, “Identification of Cascaded Microwave Circuits with Moderate Reflections Using Reflection and Transmission Measurements,” IEEE Transactions on Microwave Theory and Techniques, vol. MTT-36, no. 2, pp. 418-423, Feb. 1988.
T. Veijola, H. Kuisma, J. Lahdenperä, and T. Ryhänen, “Equivalent-circuit model of the squeezed gas film in a silicon accelerometer,” Sensors and Actuators: A. Physical, vol. 48, no. 3, pp. 239-248, 1995.
T. Veijola, H. Kuisma, J. Lahdenperä, and T. Ryhänen, “Simulation model for micromechanical angular rate sensor,” Sensors and Actuators, vol. A60, pp. 113-121, 1997.
T. Veijola, H. Kuisma, and J. Lahdenperä, “The influence of gas-surface interaction on gas-film damping in a silicon accelerometer,” Sensors and Actuators A Physical, vol. A66, pp. 83-92, 1998.
T. Veijola, “Simulation of MEMS dynamics with a circuit simulator,” Micro Structure Bulletin, vol. 7, no. 3, p. 3, 1999.
T. Veijola, T. Corman, P. Enoksson, and G. Stemme, “Dynamic simulation model for a vibrating fluid density sensor,” Sensors and Actuators, vol. A76, pp. 213-224, 1999.
T. Veijola and T. Mattila, “Modeling of nonlinear micromechanical resonators and their simulation with the harmonic-balance method,” RF and Microwave Computer-Aided Engineering, vol. 11, no. 5, pp. 310-321, 2001.
T. Veijola and M. Turowski, “Compact damping models for laterally moving microstructures with gas-rarefaction effects,” Journal of Microelectromechanical Systems, vol. 10, no. 2, pp. 263-272, 2001.
T. Veijola, “Compact models for squeezed-film dampers with inertial and rarefied gas effects,” Journal of Micromechanics and Microengineering, vol. 14, no. 7, pp. 1109-1118, 2004.
H. Nieminen, J. Hyyryläinen, T. Veijola, T. Ryhänen, and V. Ermolov, “Transient capacitance measurement of MEM capacitor,” Sensors and Actuators A, Physical, vol. A117, pp. 267-272, 2005.
T. Veijola, A. Pursula, and P. Råback, “Extending the validity of squeezed-film damper models with elongations of surface dimensions,” Journal of Micromechanics and Microengineering, vol. 15, pp. 1624-1636, 2005.
A. Kallio and T. Veijola, “Synthesis of reduced equivalent circuits for transmission lines,” IEEE Transactions on Circuits and Systems - I: Regular Papers, vol. 53, no. 10. October 2006, pp. 2255-2264, 2006.
T. Veijola, “Analytic damping model for an MEM perforation cell,” Microfluidics and Nanofluidics, vol. 2, no. 3, pp. 249-260, 2006.
T. Veijola, “A two-port model for wave propagation along a long circular microchannel,” Microfluidics and Nanofluidics, vol. 3, no. 3, pp. 359-367, 2007.
T. Veijola and P. Råback, “Methods for solving gas damping problems in perforated microstructures using a 2D finite-element solver,” Sensors, no. 7, pp. 1069-1090, 2007.
G. De Pasquale and T. Veijola, “Comparative numerical study of FEM methods solving gas damping in perforated MEMS devices,” Microfluidics and Nanofluidics, vol. 5, no. 4, pp. 517-528, 2008.
O. Holmgren, K. Kokkonen, T. Veijola, T. Mattila, V. Kaajakari, A. Oja, J. Knuuttila, and M. Kaivola, “Analysis of vibration modes in a micromechanical square-plate resonator,” Journal of Micromechanics and Microengineering, vol. 19, no. 1, p. 015028, 2009.
T. Veijola, G. De Pasquale, and A. Somà, “Experimental validation of compact damping models of perforated MEMS devices,” Microsystem Technologies, vol. 15, no. 8, pp. 1121-1128, 2009.
T. Veijola and A. Lehtovuori, “Numerical and analytical modelling of trapped gas in micromechanical squeeze-film dampers,” Journal of Sound and Vibration, vol. 319, pp. 606-621, 2009.
T. Veijola, “Compact model for a MEM perforation cell with viscous, spring, and inertial forces,” Microfluidics and Nanofluidics, vol. 6, no. 2, pp. 203-219, 2009.
G. De Pasquale, T. Veijola, and A. Somá, “Modelling and validation of air damping in perforated gold and silicon MEMS plates,” Journal of Micromechanics and Microengineering, vol. 20, p. 015010, 2010.
54 papers
T. Veijola and M. Valtonen, “Dispersive Transmission Line Model for Nonlinear Time Domain Circuit Analysis,” Proceedings of ISCAS'88, Espoo, Finland, 1988, pp. 2839-2842.
P. Heikkilä, M. Valtonen, and T. Veijola, “Harmonic Balance of Nonlinear Circuits with Multitone Excitation,” Proceedings of ECCTD'91, Copenhagen, vol. 2, 1991, pp. 802-811.
M. Valtonen, P. Heikkilä, A. Kankkunen, K. Mannersalo, R. Niutanen, P. Stenius, T. Veijola, and J. Virtanen, “APLAC - A New Approach to Circuit Simulation by Object-Orientation,” Proceedings of ECCTD'91, Copenhagen, vol. 1, 1991, pp. 351-360.
H. Jokinen, M. Valtonen, and T. Veijola, “Fast analysis of nonideal switched capacitor circuits using convolution,” in European conference on circuits theory and design ECCTD'93, Davos, Switzerland, 1993, pp. 941-946.
T. Veijola and T. Ryhänen, “Model of capacitive micromechanical accelerometer including effect of squeezed gas film,” in Proceedings of IEEE Int. Symp. on Circuits and Systems (ISCAS'95), Seattle, USA, 1995, pp. 664-887.
T. Veijola, T. Ryhänen, H. Kuisma, and J. Lahdenperä, “Circuit simulation model of gas damping in microstructures with nontrivial geometries,” Stockholm, Sverige, Eurosensors IX, 1995, pp. 36-40.
T. Veijola and M. Valtonen, “An object-oriented approach to combined electrical and thermal circuit analysis,” in Proceedings of European Conference on Circuit Theory and Design (ECCTD'95), Istanbul, Turkey, August 1995, pp. 1055-1058.
T. Veijola, “An equivalent circuit model for gas diffusion process in polymers,” in Proc. of Eurosensors X on Solid-State Transducers, Leuven, September 1996, pp. 973-976.
T. Veijola, M. Andersson, and A. Kallio, “Parameter extraction procedure for an electrothermal transistor model,” in Proc. of the Baltic Electronics Conference, Tallinn, October 1996, pp. 73-76.
T. Veijola, A. Kallio, and M. Valtonen, “Implementation of electrothermal simulation in APLAC,” in URSI/IEEE/IRC XXI Convention on Radio Science, Espoo, October 1996, pp. 185-186.
T. Veijola, H. Kuisma, J. Lahdenperä, and T. Ryhänen, “Simulation model for micromechanical angular rate sensor,” in Proceedings of Eurosensors X and Solid-State Transducers, Leuven, Belgium, September 1996, pp. 1365-1368.
T. Veijola, “Model for thermal spreading impedance in GaAs MESFETs,” in Proc. of the Third IEEE Int. Conf. on Electronics, Circuits and Systems, Rhodos, October 1996, pp. 872-875.
T. Veijola, “Simple model for thermal spreading impedance,” in Proc. of the Baltic Electronics Conference, Tallinna, October 1996, pp. 73-76.
T. Veijola, “Thermal spreading impedance model for GaAs MESFETs,” in URSI/IEEE/IRC XXI Convention on Radio Science, Espoo, October 1996, pp. 157-158.
T. Veijola and M. Andersson, “Combined electrical and thermal parameter extraction for transistor model,” in Proceedings of the 1997 European Conference on Circuit Theory and Design, Budapest, European Circuit Society, September 1997, pp. 754-759.
T. Veijola, H. Kuisma, and J. Lahdenperä, “Model for gas film damping in a silicon accelerometer,” in Proceedings of 1997 International conference on Solid-State Sensors and Actuators, Chicago, USA, IEEE Electron Devices Society Vol. 2, 1997, pp. 1097-1100.
T. Veijola, L. Costa, and M. Valtonen, “An implementation of electrothermal component models in a general purpose circuit simulation program,” in 3rd International Workshop on Thermal Investigations of ICs and Microstructures, Cannes, TIMA Grenoble, September 1997, pp. 96-100.
T. Veijola and T. Corman, “Dynamic simulation model for a vibrating fluid density sensor,” in Proc. of the 12th Conf. on Solid-State Transducers and the 9th UK Conf. on Sensors and their Applications (N.M.White, ed.), Bristol, Institute of Physics Publishing, September 1998, pp. 377-380.
T. Veijola, H. Kuisma, and J. Lahdenperä, “Dynamic modelling and simulation of microelectromechanical devices with a circuit simulation program,” in Technical Proceedings of MSM98, Santa Clara, USA, April 1998, pp. 245-250.
T. Veijola, “Electrothermal simulation models for NTC and PTC thermistors,” in Proc. of the 2nd IMACS Int. Conference on Circuits, Systems and Computers (N. E. Mastorakis, ed.), Piraeus, October 1998, pp. 950-955.
T. Veijola, H. Kuisma, and J. Lahdenperä, “Compact large-displacement model for a capacitive accelerometer,” in Technical Proceedings of the Second Int. Conf. on Modeling and Simulation of Microsystems, USA, April 1999, pp. 218-221.
T. Veijola, “Large-signal simulation model for PTC thermistor,” in Proc. of the European Conf. on Circuit Theory and Design, September 1999, pp. 687-690.
T. Veijola, “Finite-difference large-displacement gas-film model,” in The 10th Int. Conf. on Solid-State Sensors and Actuators, Japan, June 1999, pp. 1152-1155.
T. Veijola, T. Mattila, O. Jaakkola, J. Kiihamäki, T. Lamminmäki, A. Oja, K. Ruokonen, H. Seppä, P. Seppälä, and I. Tittonen, “Large-displacement modelling and simulation of micromechanical electrostatically driven resonators using the harmonic balance method,” in 2000 IEEE MTT-S International Microwave Symposium Digest (T. Perkins and J. Wendler, eds.), Boston, Massachussetts, USA, June 2000, pp. 99-102.
T. Veijola, “Compact damping models for lateral structures including gas rarefaction effects,” in Proceedings of the third MSM, San Diego, USA, 2000, pp. 162-165.
T. Veijola, “Acoustic impedance elements modeling oscillating gas flow in micro channels,” in Technical Proceedings of the 4th International Conference on MSM, USA, March 2001, pp. 96-99.
T. Veijola and T. Mattila, “Compact squeezed-film damping model for perforated surface,” in Digest of Technical Papers of Transducers'01 and Eurosensors XV, Munich, Germany, 2001, pp. 1506-1509.
T. Veijola, K. Ruokonen, and I. Tittonen, “Compact squeezed-film damping model including the open border effects,” in Technical Proceedings of the 4th International Conference on MSM, South Carolina, USA, March 2001, pp. 76-79.
T. Veijola, “Nonlinear circuit simulation of MEMS components: Controlled current source approach,” in Proceedings of the 15th European Conference on Circuit Theory and Design (V. Porra, M. Valtonen, I. Hartimo, M. Ilmonen, O. Simula, and T. Veijola, eds.), Espoo, Helsinki University of Technology, August 2001, pp. 377-380.
T. Veijola, T. Tinttunen, H. Nieminen, V. Ermolov, and T. Ryhänen, “Gas damping model for a RF MEM switch and its dynamic characteristics,” in Proceedings of International Microwave Symposium (IMS), Seattle, USA, 2002, pp. 1213-1216.
T. Tinttunen, T. Veijola, H. Nieminen, V. Ermolov, and T. Ryhänen, “Static equivalent circuit model for a capacitive MEMS RF switch,” in 2002 International Conference on Modeling and Simulation of Microsystems, San Juan, Puerto Rico, April 2002, pp. 166-169.
T. Veijola, “End effects of rare gas flow in short channels and in squeezed-film dampers,” in Proceedings of MSM 2002 (M. Laudon and B. Romanowicz, eds.), USA, April 2002, pp. 104-107.
T. Veijola, “Model for flow resistance of a rare gas accounting for surface roughness,” in Proceedings of Nanotech 2003, vol. 2 (M. Laudon and B. Romanowicz, eds.), USA, Computational Publications, February 2003, pp. 492-495.
P. Råback, A. Pursula, V. Junttila, and T. Veijola, “Hierarchical finite element simulation of perforated plates with arbitrary hole geometries,” in Proceedings of Nanotech 2003, vol. 1 (M. Laudon and B. Romanowicz, eds.), USA, Computational Publications, February 2003, pp. 194-197.
T. Veijola and S. Lähteenmäki, “Electrical equivalent-circuit model for small-current electromechanic metal contact,” in Proceedings of ECCTD'03, vol. 3 (B. Z.Galias and M. B.Kadeja, eds.), September 2003, pp. 209-212.
T. Veijola, A. Pursula, and P. Råback, “Extending the validity of existing squeezed-film damper models with elongations of surface dimensions,” in NSTI Nanotech 2004, Technical Proceedings, vol. 2 (M. Laudon and B. Romanowicz, eds.), Boston, USA, Nano Science and Technology Institute, March 2004, pp. 235-238.
T. Veijola, “Compact models for squeezed-film dampers with inertial effects,” in Symposium on Design, Test, Integration and Packaging of MEMS and MOEMS, Montreux, Switzerland, May 2004, pp. 365-369.
T. Veijola, “Compact model for a cantilever beam MEM contact switch,” in Proceedings of ECCTD'05, Cork, Ireland,, University College Cork, September 2005, pp. 47-50.
T. Veijola, A. Pursula, and P. Råback, “Surface extension model for MEMS squeezed-film dampers,” in Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS, Montreux, Switzerland, June 2005, pp. 405-410.
T. Veijola and P. Råback, “A method for solving arbitrary MEMS perforation problems with rare gas effects,” in NSTI Nanotech, 2005, Anaheim, USA, Nano Science and Technology Institute, May 2005, pp. 561-564.
T. Veijola, “Analytic damping model for a square perforation cell,” in NSTI-Nanotech, Boston, USA, Nano Science and Technology Institute, May 2006, pp. 554-557.
T. Veijola, “Analytic model for perforated squeezed-film dampers.,” in DTIP of MEMS & MOEMS, Stresa, Italy, TIMA Editions, April 2006, pp. 35-41.
T. Veijola, “An electrical equivalent circuit model for RF MEMS disk resonators,” in Proceedings of ECCTD 2007, Sevilla, Spain, August 2007, pp. 962-965.
T. Veijola, “Quality factor and resonance frequency shift due to air in RF MEMS radial disk resonators,” in Transducers & Eurosensors XXI '07, France, IEEE, 2007, pp. 643-646.
T. Veijola, “Simple but accurate models for squeeze-film dampers,” in IEEE Sensors 2007, Atlanta USA, 2007 IEEE, October 2007, pp. 83-86.
T. Veijola and A. Lehtovuori, “Model for gas damping in air gaps of RF MEMS resonators,” in Design, Test, Integration and Packaging of MEMS/MOEMS 2007 (K. Chakrabarty, B. Courtois, E. Jung, V. Kempe, and R. Laur, eds.), Stresa, Italy, April 2007, pp. 156-161.
T. Veijola, G. De Pasquale, and A. Somà, “Comparison between damping coefficients of measured perforated structures and compact models,” in Design, Test, Integration and Packaging of MEMS/MOEMS, Nice, France, DTIP 2008, April 2008, pp. 236-241.
T. Veijola and A. Lehtovuori, “Numerical and compact modelling of squeeze-film damping in RF MEMS resonator,” in Design, Test, Integration and Packaging of MEMS/MOEMS, Nice, France, DTIP 2008, April 2008, pp. 222-228.
G. De Pasquale, T. Veijola, and A. Somá, “Gas damping effect on thin vibrating gold plates: Experiments and modeling,” in Proceedings of Design, Test , Integration and Packaging of MESMS/MOEMS, DTIP 2009, Rome, Italy, EDA Publishing, April 2009, pp. 23-28.
T. Veijola, “Compressible squeeze-films in vibrating MEMS structures at high frequencies,” in Proceedings of Design, Test , Integration and Packaging of MESMS/MOEMS, DTIP 2009, Rome, Italy, EDA Publishing, April 2009, pp. 235-238.
T. Veijola, “3D FEM simulations of perforated MEMS gas dampers,” in Proceedings of Design, Test , Integration and Packaging of MESMS/MOEMS, DTIP 2009, Rome, Italy, EDA Publishing, April 2009, pp. 243-250.
A. Kallio, T. Veijola, J. Roos, M. Andersson, and M. Valtonen, “General measurement-based circuit model for symmetrical four-port RF transformers,” in Proceedings of European Conference on Circuit Theory and Design (ECCTD'09), Antalya, Turkey, August 2009, pp. 371-374.
M. Hulkkonen, T. Veijola, A. Kallio, M. Andersson, and M. Valtonen, “Measurement-based equivalent circuit model for ferrite beads,” in Proceedings of European Conference on Circuit Theory and Design (ECCTD'09), Antalya, Turkey, August 2009, pp. 363-366.
G. De Pasquale, T. Veijola, and A. Somá, “Energy dissipation associated with material damping on vibrating MEMS components,” in Proceedings of Design, Test, Integration and Packaging of MESMS/MOEMS (DTIP 2010), Seville, Spain, May 2010, pp. 99-104.
11 papers
T. Veijola and M. Valtonen, “Identification of Cascaded Microwave Circuits with Moderate Reflections Using Reflection and Transmission Measurements,” Tech. Rep. CT-3, Teknillinen korkeakoulu, teoreettisen sähkötekniikan laboratorio, Espoo, November 1987.
T. Veijola, “Accelerometer model in APLAC,” Tech. Rep. CT-18, TKK Offset, Espoo, 1994.
M. Lähepelto and T. Veijola, “MEXTRAM 503 BJT model in APLAC,” Tech. Rep. CT-26, Helsinki University of Technology, Circuit Theory Laboratory, Espoo, 1995.
T. Veijola and M. Valtonen, “Combined electrical and thermal circuit simulation using APLAC. Part A: Implementation and basic component models,” Tech. Rep. CT-25, University of Technology, Circuit Theory Laboratory, Espoo, 1995.
T. Veijola and M. Valtonen, “Combined electrical and thermal circuit simulation using APLAC, Part B: Electrothermal diode and transistor,” Tech. Rep. CT-27, HUT, Circuit Theory Laboratory, Espoo, 1996.
T. Veijola, H. Kuisma, and J. Lahdenperä, “Model for GAS film damping in a silicon accelerometer,” Tech. Rep. CT-29, Helsinki University of Technology, Espoo, 1997.
T. Veijola and L. Costa, “Combined electrical and thermal circuit simulation using APLAC. Part C: Thermal spreading impedance models,” tech. rep. CT-35, HUT, Espoo, 1998.
T. Veijola, “Accelerometer level 3 and 4 models in APLAC,” tech. rep. CT-36, HUT, Espoo, 1998.
T. Veijola, “Equivalent circuit models for micromechanical inertial sensors,” Tech. Rep. CT-39, HUT, Espoo, 1999.
T. Veijola and T. Mattila, “Modelling of nonlinear micromechanical resonators and their simulation with harmonic-balance method,” Tech. Rep. CT-42, Helsinki University of Technology, Circuit Theory Laboratory, Helsinki, 2000.
T. Veijola and M. Turowski, “Compact damping models for laterally moving microstructures with gas-rarefaction effects,” Tech. Rep. CT-41, Helsinki University of Technology, Circuit Theory Laboratory, Helsinki, 2000.
2 books
M. Valtonen, P. Heikkilä, A. Kankkunen, C. Kabrell, K. Mannersalo, R. Niutanen, M. Puumalainen, H. Rekonen, P. Stenius, L. Tiilikainen, T. Veijola, and J. Virtanen, APLAC - An object oriented analog circuit simulator and design tool. User's Manual. Espoo: Teknillinen korkeakoulu, teoreettisen sähkötekniikan laboratorio, 1992.
M. Valtonen, P. Heikkilä, A. Kankkunen, C. Kabrell, K. Mannersalo, R. Niutanen, M. Puumalainen, H. Rekonen, P. Stenius, L. Tiilikainen, T. Veijola, and J. Virtanen, APLAC - An object oriented analog circuit simulator and design tool. 6.1 Reference Manual. Espoo: Teknillinen korkeakoulu, teoreettisen sähkötekniikan laboratorio, 1992.
3 chapters
M. Valtonen, P. Heikkilä, H. Jokinen, and T. Veijola, Low-Power HF Microelectronics, a unified approach. Chapter 9: APLAC: object-oriented circuit simulator and design tool. London: IEE Circuits and Systems Series 8, 1996.
T. Veijola, “Squeeze-film damping models for micromechanical structures,” in CSC Report on Scientific Computing in Finland 2004-2005 (Fagerholm, Puska, and Åström, eds.), Espoo, CSC, 2005, pp. 154-157.
T. Veijola, “Gas damping in vibrating MEMS structures,” in Handbook of Silicon Based MEMS Materials and Technologies (V. Lindroos, M. Tilli, A. Lehto, and T. Motooka, eds.), Amsterdam, Elsevier, 2010, pp. 259-279.
2 papers
T. Veijola and M. Valtonen, “An Automatic Microwave Nework Analyzer,” URSI X Convention on Radio Science, Oulu, October 1980.
T. Veijola and V. Porra, “Linear Time-domain FFT program for Microwave Circuits,” URSI XI Convention on Radio Science, Espoo, October 1983.