Luis Carlos Cotimos Nunes

Luis Nunes

Academic position:	Researcher
Joining date:	01-07-2017
Roles in IT:	Researcher
Scientific Area:	Wireless Communications
Group:	Wireless Circuits – Av

Email: Send Email
Address: IT – Aveiro
Instituto de Telecomunicações
Campus Universitário de Santiago
P-3810-193 AVEIRO - PORTUGAL
Tel: +351 234 377 900
Fax: +351 234 377 901

https://www.orcid.org/0000-0003-2403-7126

SCOPUS SCHOLAR LinkedIn

Scientific Achievements

Degrees

PhD, Universidade de Aveiro, 10-12-2015
MSc, Universidade de Aveiro, 25-11-2010

Expertise Topics

Device Modeling
Nonlinear Distortion
Power Amplifier Design

Affiliations

Instituto de Telecomunicações, 03-07-2017, Research Assistant
IEEE - Institute of Electrical and Electronics Engineers, 07-01-2013, Member
IEEE Microwave Theory and Techniques Society, 07-01-2013, Member

Academic Activities

2Lecture courses

Programação em Matlab, Universidade de Aveiro, Engenharia Eletronica e Telecomunicações
Projecto Industrial, Universidade de Aveiro, Engenharia Eletronica e Telecomunicações

Supervision of theses

2PhD Student

Power Amplifier Design using Artificial Intelligence, PhD Student, Catarina Alexandra Xavier Belchior, Expected conclusion 07-2023
Behavior Transistor Models for Power Amplifier Design, PhD Student, João Paulo Louro Mendes, Expected conclusion 07-2023

1MSc Student

Microwave Active Load-Pull System, MSc Student, Daniel Alberto Pereira da Cunha, Expected conclusion 07-2020

Co-Supervision of theses

1PhD Student

GaN HEMT Device Modeling, PhD Student, João Lucas Lessa Gomes, Expected conclusion 07-2022

2MSc Student

Amplificador de Potência para Sistemas 5G, MSc Student, Catarina Alexandra Xavier Belchior, Concluded 07-2019
Implementação de um Transmissor MIMO para Sistemas 5G, MSc Student, Carlos Henrique Cabral Medeiros, Concluded 12-2018

Publications

1Books

J. C. Pedro, D. Root, J. Xu, L. C. Nunes, Nonlinear Circuit Simualtion and Modeling - Fundamentals for Microwave Design, Cambridge University Press, New York, 2018,
| BibTex

10Papers in Journals

D. Barros, L. C. Nunes, P. M. Cabral, J. C. Pedro, Impact of the Input Baseband Terminations on the Efficiency of Wideband Power Amplifiers Under Concurrent Band Operation, IEEE Transactions on Microwave Theory and Techniques, Vol. 67, No. 12, pp. 5127 - 5138, December, 2019,
| Abstract | Full text (PDF 4 MBs) | BibTex
J. Gomes, L. C. Nunes, C. Gonçalves, J. C. Pedro, An Accurate Characterization of Capture Time Constants in GaN HEMTs, IEEE Transactions on Microwave Theory and Techniques, Vol. 67, No. 7, pp. 2465 - 2474, July, 2019 | BibTex
L. C. Nunes, D. Barros, P. M. Cabral, J. C. Pedro, Efficiency Degradation Analysis in Wideband Power Amplifiers, IEEE Transactions on Microwave Theory and Techniques, Vol. 66, No. 12, pp. 5640 - 5651, December, 2018 | BibTex
J. Gomes, L. C. Nunes, N. Sobolev, J. C. Pedro, Memristive Properties of GaN HEMTs Containing Deep‐Level Traps, physica status solidi (b) – basic solid state physics, Vol. 256, No. 5, pp. 1800387 - 1800387, December, 2018 | BibTex
C. Gonçalves, L. C. Nunes, P. M. Cabral, J. C. Pedro, Pulsed I/V and S-parameters measurement system for isodynamic characterization of power GaN HEMT transistors, Intrnl. Journal of RF and Microwave Computer-Aided Engineering, Vol. 28, No. 8, pp. e21515 - e21515, August, 2018 | BibTex
F. M. B. Barradas, L. C. Nunes, T.R. Cunha, P.M.L. Lavrador, P. M. Cabral, J. C. Pedro, Compensation of Long-Term Memory Effects on GaN HEMT-Based Power Amplifiers, IEEE Transactions on Microwave Theory and Techniques, Vol. 65, No. 9, pp. 3379 - 3388, March, 2017,
| Abstract | BibTex
P. M. Cabral, L. C. Nunes, T. R. Ressurreição, J. C. Pedro, Trapping behavior of GaN HEMTs and its implications on class B PA bias point selection, International Journal of Numerical Modelling: Electronic Networks, Devices and Fields, Vol. 30, No. 1, pp. 1 - 11, January, 2017 | BibTex
J. C. Pedro, L. C. Nunes, P. M. Cabral, A Simple Method to Estimate the Output Power and Efficiency Load-Pull Contours of Class B Power Amplifiers, IEEE Transactions on Microwave Theory and Techniques, Vol. 63, No. 4, pp. 1239 - 1249, April, 2015 | BibTex
F. M. B. Barradas, L. C. Nunes, J. C. Pedro, T.R. Cunha, P.M.L. Lavrador, P. M. Cabral, Accurate Linearization with Low-Complexity Models Using Cascaded Digital Predistortion Systems, IEEE Microwave Magazine, Vol. 16, No. 1, pp. 94 - 103, February, 2015 | BibTex
L. C. Nunes, P. M. Cabral, J. C. Pedro, AM/AM and AM/PM Distortion Generation Mechanisms in Si LDMOS and GaN HEMT Based RF Power Amplifiers, IEEE Transactions on Microwave Theory and Techniques, Vol. 62, No. 4, pp. 799 - 809, April, 2014 | BibTex

20Papers in Conferences

L. C. Nunes, F. M. B. Barradas, D. Barros, P. M. Cabral, J. C. Pedro, Current Mode Outphasing Power Amplifier, IEEE International Microwave Symposium IMS, Boston, United States, Vol., pp. -, June, 2019 | BibTex
D. Barros, L. C. Nunes, P. M. Cabral, J. C. Pedro, Impact of the Input Baseband Impedance on the Instantaneous Bandwidth of Wideband Power Amplifiers, IEEE International Microwave Symposium IMS, Boston, United States, Vol., pp. -, June, 2019 | BibTex
J. Gomes, L. C. Nunes, C. Gonçalves, J. C. Pedro, Deep-Level Traps’ Capture Time Constant and its Impact on Nonlinear GaN HEMT Modeling, International Workshop on Integrated Nonlinear Microwave and Millimeter-Wave Circuits - INMMIC, Brive-la-Gaillarde, France, Vol., pp. -, July, 2018 | BibTex
L. C. Nunes, D. Barros, P. M. Cabral, J. C. Pedro, Efficiency Degradation in Wideband Power Amplifiers, IEEE International Microwave Symposium IMS, Philadelphia, United States, Vol., pp. -, June, 2018 | BibTex
L. C. Nunes, J. Gomes, P. M. Cabral, J. C. Pedro, A Simple Method to Extract Trapping Time Constants of GaN HEMTs, IEEE International Microwave Symposium IMS, Philadelphia, United States, Vol., pp. -, June, 2018 | BibTex
C. Gonçalves, P. M. Cabral, L. C. Nunes, J. C. Pedro, Conservative Current and Charge Data Extracted from Pulsed S-Parameter Measurements for GaN HEMT PA Design, IEEE International Symp. on Microwave Theory and Tech., Hawaii, United States, Vol., pp. -, June, 2017 | BibTex
P. M. Cabral, L. C. Nunes, J. C. Pedro, High Power Wireless Applications of Si and GaN Devices, Workshop on Compound Semiconductor Devices and Integrated Circuits held in Europe WOCSDICE, Aveiro, Portugal, Vol. .., pp. .. - .., June, 2016 | BibTex
L. C. Nunes, P. M. Cabral, J. C. Pedro, AM/PM distortion physical origins in Si LDMOS Doherty power amplifiers, IEEE International Microwave Theory and Tech. Symp., San Francisco, United States, Vol., pp. -, May, 2016 | BibTex
L. C. Nunes, P. M. Cabral, J. C. Pedro, Impact of Trapping Effects on GaN HEMT Based Doherty PA Load-Pull Ratios, International Workshop on Integrated Nonlinear Microwave and Millimeter-Wave Circuits - INMMIC, Taormina, Italy, Vol., pp. -, October, 2015 | BibTex
L. C. Nunes, P. M. Cabral, J. C. Pedro, LUT Based Behavioral Model for Doherty Power Amplifier Design, Conf. on Telecommunications - ConfTele, Aveiro, Portugal, Vol., pp. -, September, 2015 | BibTex
L. C. Nunes, P. M. Cabral, J. C. Pedro, A New Nonlinear Model Extraction Methodology for GaN HEMTs Subject to Trapping Effects, IEEE International Microwave Theory and Tech. Symp., Phoenix, United States, Vol., pp. -, May, 2015 | BibTex
J. C. Pedro, L. C. Nunes, P. M. Cabral, Soft compression and the origins of nonlinear behavior of GaN HEMTs, European Microwave Conf. - EMC, Roma, Italy, Vol. 1, pp. 1297 - 1300, October, 2014,
| Abstract | BibTex
J. C. Pedro, L. C. Nunes, Efficiency dependence on the load-pull ratio of a Doherty PA, IEEE International Symp. on Microwave Theory and Tech., Seatle, United States, Vol. 1, pp. 1 - 4, June, 2014,
| Abstract | BibTex
L. C. Nunes, P. M. Cabral, J. C. Pedro, AM/PM Distortion in GaN Doherty Power Amplifiers, IEEE International Microwave Theory and Tech. Symp., Tampa, United States, Vol., pp. -, June, 2014 | BibTex
L. C. Nunes, P. M. Cabral, J. C. Pedro, Study of the GaN HEMT Doherty Power Amplifier Distortion, International Workshop on Integrated Nonlinear Microwave and Millimeter-Wave Circuits - INMMIC, Leuven, Belgium, Vol., pp. -, April, 2014 | BibTex
T.R. Cunha, P. M. Cabral, L. C. Nunes, Characterizing power amplifier static AM/PM with spectrum analyzer measurements, IEEE International Conf. on Signals, Systems, Devices - SSD, Barcelona, Spain, Vol. 1, pp. 1 - 4, February, 2014 | BibTex
J. C. Pedro, L. C. Nunes, A Single-Ended Power Amplifier Behavioral Model for AM/AM and AM/PM Predictions, IEEE Topical Conf. on RF Power Amplifiers for Radio and Wireless Applications - PAWR, Newport Beach, United States, Vol. 1, pp. 79 - 81, January, 2014,
| Abstract | BibTex
J. C. Pedro, L. C. Nunes, P.M.L. Lavrador, A New Large-Signal Intermodulation and Spurious Analysis Tool, IEEE International Microwave Theory and Tech. Symp., Seattle, United States, Vol. 1, pp. 1 - 1, June, 2013 | BibTex
L. C. Nunes, P. M. Cabral, J. C. Pedro, A Physical Model of Power Amplifiers’ AM/AM and AM/PM Distortions and Their Internal Relationship, IEEE International Microwave Theory and Tech. Symp., Seatle, United States, Vol., pp. -, June, 2013 | BibTex
L. C. Nunes, P. M. Cabral, J. C. Pedro, A large-signal physical model of the AM/PM characteristic of a RF power amplifier, Conf. on Telecommunications - ConfTele, Castelo Branco, Portugal, Vol., pp. -, May, 2013 | BibTex

Projects

Currently running projects2

Acronym	Name	Funding Agency	Start date	Ending date
TUPP	Modeling of Power Amplifier Devices	Huawei Technologies Sweden	01-01-2018	01-12-2020
XiongJi	Wideband Power Amplifier Design Methodologies	Huawei Technologies Sweden	01-06-2019	30-06-2023

Closed Projects2

Acronym	Name	Funding Agency	Start date	Ending date
HLPA2MIMO	Highly Linear Power Amplifier for Massive MIMO	Ampleon	01-07-2016	01-06-2020
ROOSTER	Rooster - Solutions to Optimize Efficiency-Linearity in High Power Multi-Band MISO Power Amplifiers	Huawei Technologies Sweden	01-07-2016	01-06-2018

Other Scientific Achievements

3Awards

F. M. B. Barradas, L. C. Nunes, Power Amplifier Linearization Through Digital Pre-Distortion Student Design Competition, Second Place, Competition for the linearization of a Radio Frequency Power Amplifier through digital predistortion. The competition entailed the study, development and deployment in a laboratory environment of the best linearization algorithms. The competition was international and took place at IMS2015., 01-07-2015
F. M. B. Barradas, L. C. Nunes, Power Amplifier Linearization Through Digital Pre-Distortion Student Design Competition, Competition for the linearization of a Radio Frequency Power Amplifier through digital predistortion. The competition entailed the study, development and deployment in a laboratory environment of the best linearization algorithms. The competition was international and took place at IMS2014., 01-07-2014
T.R. Cunha, P. M. Cabral, L. C. Nunes, Characterizing power amplifier static AM/PM with spectrum analyzer measurements, Best Paper Award - CCSP-SSD'14, Best paper award for the paper ''Characterizing power amplifier static AM/PM with spectrum analyzer measurements'' presented at the IEEE 11th International Multi-Conference on Systems, Signals and Devices - Conference on Communication & Signal Processing, CCSP-SSD’14, Castelldefels-Barcelona, Spain, February 11-14, 2014., 01-02-2014, 01-02-2014

3Short Courses and Seminars

L. C. Nunes, F. M. B. Barradas, C. Gonçalves, J. Gomes, PMT Tomé, T.R. Cunha, P. M. Cabral, J. C. Pedro, Long-Term Memory Effects in GaN Devices: From Modeling to Compensation, Spain, 09-2018
F. M. B. Barradas, T.R. Cunha, PMT Tomé, P.M.L. Lavrador, P. M. Cabral, L. C. Nunes, J. C. Pedro, Prediction and Compensation of PA Linearity and Efficiency in MIMO scenarios, Spain, Madrid, 09-2018
T.R. Cunha, P. M. Cabral, L. C. Nunes, F. M. B. Barradas, J. C. Pedro, Wideband power amplifier linearization: from active device distortion to DPD compensation, United States, Austin, TX, 01-2016

Other Contributions

3Refereeing Journals

IEEE Transactions on Microwave Theory and Techniques
2019, 5 review(s); 2018, 3 review(s); 2017, 2 review(s); 2016, 1 review(s); 2015, 1 review(s); 2014, 1 review(s);
IEEE Transactions on Power Electronics
2017, 1 review(s);
International Journal of RF and Microwave Computer-Aided Engineering
2019, 5 review(s);

IT Member Profile