Creating and sharing knowledge for telecommunications

IT Member Profile

... João José Lopes da Costa Freire

Senior Researcher

João Costa Freire

Academic position: Associate Professor
Joining date: 01-01-1999
Roles in IT: Senior Researcher
Thematic Line: Wireless Technologies
Group: Wireless Circuits – Lx

Email: Send Email
Address: IT – Lisboa
Instituto Superior Técnico - Torre Norte - Piso 10
Av. Rovisco Pais, 1
1049 - 001 Lisboa
Tel: +351 21 841 84 54
Fax: +351 21 841 84 72

Scientific Achievements

  • Agregação, Instituto Superior Técnico, 05-12-1992
  • PhD, Instituto Superior Técnico, 04-07-1984
  • Licenciatura, Instituto Superior Técnico, 30-03-1975
  • Instituto Superior Técnico, 01-04-1975, Associate Professor
14Papers in Journals
  • J. Torres, J. Costa Freire, 30 GHz SiGe active inductor with voltage controlled Q, Integration, the VLSI Journal, Vol. 77, No. 3, pp. 13 - 24, March, 2021,
    | Abstract     | BibTex
  • M. Pereira, J. T. Sousa, J. Costa Freire, J. Vaz, A 1.7-mW -92-dBm Sensitivity Low-IF Receiver in 0.13-μm CMOS for Bluetooth LE Applications, IEEE Transactions on Microwave Theory and Techniques, Vol. 67, No. 1, pp. 332 - 346, January, 2019 | BibTex
  • M. Pereira, J. Vaz, C.A. Leme, J. Costa Freire, Gain Compression Improvement on Low-Power Cascaded Current Reuse LNAs, International Journal of Circuit Theory and Applications, Vol. 44, No. 10, pp. 1767 - 1779, October, 2016,
    | Abstract     | BibTex
  • M. Pandey, A. Canelas, R. P. Póvoa, J. Torres, J. Costa Freire, N. Lourenço, N. Horta, Design and application of a CMOS active inductor at Ku band based on a multi-objective optimizer, Integration, the VLSI Journal, Vol., No., pp. -, September, 2016 | BibTex
  • M. Pereira, J. Vaz, C.A. Leme, J. T. Sousa, J. Costa Freire, A 170-μA All-Digital GFSK Demodulator with Rejection of Low SNR Packets for Bluetooth-LE, IEEE Microwave and Wireless Components Letters, Vol. 26, No. 6, pp. 452 - 454, June, 2016,
    | Abstract     | BibTex
  • J. Torres, J. Costa Freire, K band SiGe HBT single ended active inductors, Integration, the VLSI Journal, Vol. 52, No. 1-380, pp. 272 - 281, January, 2016,
    | Abstract     | Full text (PDF 3 MBs) | BibTex
  • M. Assunção, P. M. Santos, J. Costa Freire, A Technique to Reduce On-Wafer Measurement Uncertainty for CMOS Transmission Line Characterization, IEEE Microwave and Wireless Components Letters, Vol. PP, No. 99, pp. 1 - 3, November, 2015 | BibTex
  • R. Sorrentino, J. Costa Freire, Microwaves in Europe, IEEE Transactions on Microwave Theory and Techniques, Vol. 50, No. 3, pp. 1056 - 1072, March, 2002 | BibTex
  • J. Torres, J. Costa Freire, Monolithic Transistors SPST Switch for L-Band, IEEE Transactions on Microwave Theory and Techniques, Vol. 50, No. 1, pp. 51 - 56, January, 2002 | BibTex
  • J. Vaz, J. Costa Freire, Millimeter-Wave Monolithic Power Amplifier for Mobile Broadband System, IEEE Transactions on Microwave Theory and Techniques, Vol. 49, No. 6, pp. 1211 - 1215, June, 2001 | BibTex
  • K. K. Tan, G.M. Marques, J. Vaz, J. Costa Freire, MMIC Lumped and Transversal Filter with LC Tuned Amplifiers, Microwave Engineering Europe, Vol. 1, No. 11, pp. 57 - 61, November, 1999 | BibTex
  • M. I. Simas, J. Costa Freire, CAD Tools to Optimize Power MOSFETs Performance Using Channel Reverse Conduction, IEEE Transactions on Power Electronics, Vol. 9, No. 5, pp. 522 - 531, September, 1994 | BibTex
  • M. Rosário, J. Costa Freire, Desing os MESFET Mixers for Maximum Conversion Gain, IEEE Transactions on Microwave Theory and Techniques, Vol. 38, No. 12, pp. 1972 - 1979, December, 1990 | BibTex
  • M. I. Simas, J. Costa Freire, M. S. Piedade, Experimental Characterization of Power VDMOS Transistors in Commutation and Derived Model for CAD, IEEE Transactions on Power Electronics, Vol. 4, No. 3, pp. 371 - 378, July, 1989 | BibTex
24Papers in Conferences
  • M. Pandey, A. Canelas, R. P. Póvoa, J. Torres, J. Costa Freire, N. Lourenço, N. Horta, Grounded Active Inductors Design Optimization for FQmax = 14.2 GHz using a 130 nm CMOS Technology, International Conf. on Synthesis, Modeling, Analysis and Simulation Methods and Applications to Circuit Design - SMACD, Istanbul, Turkey, Vol. -, pp. 1 - 4, September, 2015 | BibTex
  • M. Pereira, J. Vaz, C.A. Leme, J. T. Sousa, J. Costa Freire, An Ultra-Low Power Low-IF GFSK Demodulator for Bluetooth-LE applications, IEEE International Symp. on Circuits and Systems - ISCAS, Lisbon, Portugal, Vol. 1, pp. 1226 - 1229, May, 2015,
    | Abstract     | BibTex
  • M. Assunção, J. Costa Freire, P. M. Santos, Lumped Model for CMOS Interconnections lines, Conf. on Telecommunications - ConfTele, Castelo Branco, Portugal, Vol. 1, pp. 21 - 24, May, 2013,
    | Abstract     | Full text (PDF 959 KBs) | BibTex
  • V. Canosa, M. Pereira, P. Gomes, J. Vaz, J. Costa Freire, Fully Integrated Switched Dual-Band CMOS LNA for 802.11b/g WLAN and WiMAX applications, European Microwave Integrated Circuits - EuMIC, Amsterdam, Netherlands, Vol., pp. 397 - 400, October, 2012,
    | Abstract     | BibTex
  • V. Canosa, M. Pereira, P. Gomes, J. Vaz, J. Costa Freire, Fully integrated switched dual-band CMOS LNA for 802.11b/g WLAN and WiMAX applications, European Microwave Integrated Circuits - EuMIC, Amsterdam, Netherlands, Vol., pp. 397 - 400, October, 2012 | BibTex
  • R. F. Ribeiro Ribeiro, L. Mendes, J. Vaz, M. Rosário, J. Costa Freire, A 130 nm CMOS LNA for 30 GHz Applications, Conf. on Telecommunications - ConfTele, Lisbon, Portugal, Vol. --, pp. -- - --, April, 2011 | BibTex
  • J. Torres, J. Costa Freire, SiGe MMICs with Spiral Inductors up to millimetre waves, Conf. on Telecommunications - ConfTele, santa Maria da Feira, Portugal, Vol. 1, pp. 0 - 1, May, 2009,
    | Abstract     | BibTex
  • J. Torres, J. Costa Freire, SiGe 30GHz active inductor based on cascode gyrator, Asia Pacific Microwave Conf. - APMC, Hong kong, Hong Kong, Vol. C4-09, pp. no page - no page, December, 2008,
    | Abstract     | BibTex
  • J. Torres, J. Costa Freire, Ku band voltage controlled oscillator on SiGe, Macau, China, Vol. 1, pp. 0 - 1, November, 2008,
    | Abstract     | BibTex
  • J. Torres, J. Vaz, J. Costa Freire, 30GHz Amplifiers with 0.25ƒÝm SiGe BiCMOS, IEEE International Conf. on Electronics, Circuits and Systems, marrakesh, Morocco, Vol. I, pp. 0 - 0, December, 2007 | BibTex
  • J. Torres, J. Costa Freire, SiGe:C BiCMOS Monolithic Millimeter Wave Integrated Circuits, Conf. on Design of Circuits and Integrated Systems, Sevilha, Spain, Vol. I, pp. 0 - 0, November, 2007 | BibTex
  • J. Torres, J. Costa Freire, Broad band Amplifier up to 30GHz with 0.25um SiGe technology, International Microwave and Optoelectronics Conf. - IMOC, Salvador, Brazil, Vol. I, pp. 166 - 169, October, 2007 | BibTex
  • J. Torres, J. Costa Freire, SiGe Inductorless Low Noise Amplifiers up to 30GHz, Conf. on Telecommunications - ConfTele, LIsbon, Portugal, Vol. 1, pp. 133 - 136, May, 2007 | BibTex
  • G. St´Aubyn, J. Vaz, J. Costa Freire, Voltage Controlled Phase Shifters on CMOS Technology, Asia Pacific Microwave Conf. - APMC, Yokohama, Japan, Vol. 1, pp. 1 - 1, December, 2006 | BibTex
  • J. Costa Freire, F. Fortes, R. Mahmoudi, A. Roermund, SiGe Monolithic LNAs for LMDS, Conf. on Design of Circuits and Integrated Systems, Lisboa, Portugal, Vol. abstracts, pp. 186 - 186, November, 2005 | BibTex
  • F. Fortes, J. Costa Freire, D. Leenaerts, R. Mahmoudi, A. Roermund, A 28.5GHz Monolithic Cascode LNA with 70GHz fT SiGe HBTs, European Solid-State Circuits, Grenoble, France, Vol. 1, pp. 93 - 96, September, 2005 | BibTex
  • M. Rosário, C. Peixeiro, S. Blaisot, P. Alleaume, J. Schrotg, T. Mueller, J. Costa Freire, Millimetre Wave Defected Ground Planar Filters on LTCC, Asia Pacific Microwave Conf. - APMC, New Delhi, India, Vol., pp. 818 - 819, December, 2004 | BibTex
  • J. Vaz, M. Rosário, J. Costa Freire, Low Cost Si MMIC Design for RF Front Ends, Asia Pacific Microwave Conf. - APMC, New Delhi, India, Vol., pp. 1 - 2, December, 2004 | BibTex
  • J. Costa Freire, R. Mahmoudi, A. Roermund, 30GHz SiGe Monolithic LNA, SPIE, Veldhoven, Netherlands, Vol. 1, pp. 115 - 119, November, 2004 | BibTex
  • M. Rosário, C. Peixeiro, S. Blaisot, P. Alleaume, J. Schrotg, T. Mueller, J. Costa Freire, Design and Optimization of mmW Defect Ground Planar Filters on LTCC, International Workshop on Microwave Filters, Toulouse, France, Vol., pp. 110 - 112, September, 2004 | BibTex
  • M. Rosário, F. Le-Strat, P. Alleaume, J. Vaz, J. Schrotg, T. Mueller, J. Costa Freire, Low Cost LTCC Filters for a 30GHz Satellite System, European Microwave Conf. - EMC, Munique, Germany, Vol. 1, pp. 817 - 820, October, 2003 | BibTex
  • F. Azevedo, M. Rosário, J. Costa Freire, CMOS Monolithic Wideband Image rejection Mixer With Polyphase Filters, Brazilian Microwave and Optolectonic Symp., Iguazu Falls, Brazil, Vol. 2, pp. 815 - 818, September, 2003 | BibTex
  • F. Azevedo, M. Rosário, J. Costa Freire, Understanding and Enhancing CMOS Monolithic Image-Rejection Mixers, Asia Pacific Microwave Conf. - APMC, Kyoto, Japan, Vol. 2, pp. 2372 - 2376, November, 2002 | BibTex
  • F. Azevedo, M. Rosário, J. Costa Freire, Effects of Mismatch on CMOS Monolithic Mixers Image Rejection, IEEE International Symp. on Personal, Indoor and Mobile Radio Commun - PIMRC, Lisbon, Portugal, Vol. 5, pp. 2372 - 2376, September, 2002 | BibTex

Closed Projects9

Acronym Name Funding Agency Start date Ending date
ACTFIL Active filters IT/LA 01-01-2004 31-12-2005
AILAIA Smart Active Printed Antennas CRUP 01-01-2007 31-12-2008
AME Advanced Microelectronics Engineering ICEP 01-10-2002 22-10-2003
GALACTIC Innovative GaAs MMICs and Avanced LTCC packaging technologies for multicomponents Ka Band subsystems EU 01-01-2002 31-12-2004
IRFDCMOS Integration of high-frequency dc-dc converters in RF CMOS SoC IT/LA 01-09-2005 01-06-2008
NLRFCMOS Desenvolvimento de modelos não lineares de dispositivos para microondas e integração monolítica de circuitos não lineares em silício para telecomunicações CRUP 01-01-2003 31-12-2004
SiGeM Silicon Germanium MMICs for RF Front End Transceivers IT/LA 01-10-2005 01-07-2008
SiMTraMil Silicon Monolithic Transceiver for Portable Communication Systems in Millimetre Wave FCT/PTDC 01-03-2010 01-11-2012
WSN_EM Wireless Sensor Network for Environmental Monitoring FCT 01-09-2018 31-08-2022
1Awards
  • J. Costa Freire, G.M. Marques, W. Tam, J. Vaz, MMIC Lumped and Transversal Filter with LC Tuned Amplifiers, Best Poster at GAAS'99 (, 05-10-1999
4Miscellaneous
  • J. Costa Freire, IEEE Region 8 Committee, Member of Technical Committee, Chairman of Educational Activities Subcommittee, 01-01-2009
  • J. Costa Freire, PhD Jury at IST, PhD Thesis Jury, Jerzy Guterman, 01-09-2008
  • J. Costa Freire, Chair of MSc Jury at IST, MSc Thesis Jury, João Vinagre, 01-07-2008
  • J. Costa Freire, IEEE Portugal Section, National Delegate, 01-06-2008
2Short Courses and Seminars
  • J. Costa Freire, 30GHz SiGe MMICs for RF Front End Transceivers, China, Macau, 12-2008
  • J. Costa Freire, QUBIC4G Monolithic LNAs for 30GHz, Netherlands, Eindhoven, 05-2004
13Conference Committees
  • Conf. on Telecommunications - ConfTele, Conference Chairman, 2011
  • Conf. on Telecommunications - ConfTele, Conference Chairman, 2011
  • Mediterranean Microwave Symp. - MMS, Technical Programme Committee, 2010
  • International Conf. on Telecommunications - ICT, Technical Programme Committee, 2009
  • IEEE International Engineering Management Conf. - IEMC Europe, Organizing Committee, 2008
  • IEEE MTT-S International Microwave Worshop Series (IMWS) on Art of Miniaturizing RF and Microwave Passive Components, Technical Programme Committee, 2008
  • VII Mediterranean Microwave Symposium, Scientific Committee, 2007
  • International Conf. on Electrical Engineering, Scientific Committee, 2007
  • VI Mediterranean Microwave Symposium, Scientific Committee, 2006
  • 1st International Conference on Electrical Engineering, Scientific Committee, 2005
  • XIVèmes Journées Nationales Microondes, Scientific Committee, 2005
  • XIIIèmes Journées Nationales Microondes, Scientific Committee, 2003
  • XIIèmes Journées Nationales Microondes, Scientific Committee, 2002
1Refereeing Journals
  • IEEE Transactions on Microwave Theory and Techniques
    2009, 1 review(s);
6Refereeing Conferences
  • International Conf. on Electrical Engineering
    2007, 1 review(s);
  • Mediterranean Microwave Symp. - MMS
    2010, 1 review(s); 2007, 1 review(s);
  • International Conf. on Telecommunications - ICT
    2009, 1 review(s);
  • IEEE MTT-S International Microwave Worshop Series (IMWS) on Art of Miniaturizing RF and Microwave Passive Components
    2008, 1 review(s);
  • Conf. on Design of Circuits and Integrated Systems
    2010, 1 review(s);

  • 2010, 1 review(s); 2008, 1 review(s);
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