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About

Vítor Grade Tavares earned his undergraduate and MSc degrees from the University of Aveiro, Portugal, and the Ph.D. degree from the Computational NeuroEngineering Laboratory, University of Florida, Gainesville, USA, in 2001, all in electrical engineering. He is currently an Assistant Professor at University of Porto and Senior Researcher at INESC-TEC, Porto. In 2010 he was a Visiting Professor at Carnegie Mellon University, USA. His research interests include low-power, mixed-signal and neuromorphic integrated-chip design and biomimetic computing, CMOS RF integrated circuit design for wireless sensor networks, and transparent electronics. He has coordinated several national projects, and also locally coordinated European projects. Most recent awards include co-recipient for the student best-paper award of the IEEE ICUWB 2014 and first place on TSMC design context in 90nm LP MS/RF in 2009. He was also awarded with a certificate of appreciation for contributions towards the advancement of IEEE and the Engineering Professions as Chair of the Education Society Chapter - Portugal section, which he co-founded.

Interest
Topics
Details

Details

008
Publications

2020

Rail-to-Rail Timing Signals Generation Using InGaZnO TFTs For Flexible X-Ray Detector

Authors
Bahubalindruni, PG; Tiwari, B; Pereira, M; Santa, A; Martins, J; Rovisco, A; Tavares, V; Martins, R; Fortunato, E; Barquinha, P;

Publication
IEEE JOURNAL OF THE ELECTRON DEVICES SOCIETY

Abstract
This paper reports on-chip rail-to-rail timing signals generation thin-film circuits for the first time. These circuits, based on a-IGZO thin-film transistors (TFTs) with a simple staggered bottom gate structure, allow row and column selection of a sensor matrix embedded in a flexible radiation sensing system. They include on-chip clock generator (ring oscillator), column selector (shift register) and row-selector (a frequency divider and a shift register). They are realised with rail-to-rail logic gates with level-shifting ability that can perform inversion and NAND logic operations. These logic gates are capable of providing full output swing between supply rails, $V_{DD}$ and $V_{SS}$ , by introducing a single additional switch for each input in bootstrapping logic gates. These circuits were characterised under normal ambient atmosphere and show an improved performance compared to the conventional logic gates with diode connected load and pseudo CMOS counterparts. By using these high-performance logic gates, a complete rail-to-rail frequency divider is presented from measurements using D-Flip Flop. In order to realize a complete compact system, an on-chip ring oscillator (output clock frequency around 1 kHz) and a shift register are also presented from simulations, where these circuits show a power consumption of 1.5 mW and 0.82 mW at a supply voltage of 8 V, respectively. While the circuit concepts described here were designed for an X-ray sensing system, they can be readily expanded to other domains where flexible on-chip timing signal generation is required, such as, smart packaging, biomedical wearable devices and RFIDs.

2020

A Multifunctional Integrated Circuit Router for Body Area Network Wearable Systems

Authors
Miyandoab, FD; Ferreira, JC; Tavares, VMG; da Silva, JM; Velez, FJ;

Publication
IEEE/ACM Transactions on Networking

Abstract

2020

Recent activities by IEEE education society portugal chapter

Authors
Fonseca, P; Gericota, M; Tavares, VG; Matos, JN;

Publication
IEEE Global Engineering Education Conference, EDUCON

Abstract
This paper reports on recent activities by the Portugal Chapter of IEEE Education Society. It begins with a reflection on the work of a Chapter and on several aspects that may impact its performance. The major activities are also presented, as well as the policies developed by the Portugal Chapter in the last year, concluding with the presentation of the two awards received at the last FIE, namely the Chapter Achievement Award and the Distinguished Chapter Leadership Award. © 2020 IEEE.

2020

Hardware architecture for integrate-and-fire signal reconstruction on FPGA

Authors
Carvalho, G; Ferreira, JC; Tavares, VG;

Publication
2020 XXXV Conference on Design of Circuits and Integrated Systems (DCIS)

Abstract

2020

IMPORTANCE OF EMPLOYER BRANDING FOR THE SUCCESS OF THE CORPORATE BRAND IN THE SME CONTEXT

Authors
Santos, JL; Tavares, V;

Publication
PROCEEDINGS OF THE INTERNATIONAL CONFERENCE OF APPLIED BUSINESS AND MANAGEMENT (ICABM2020)

Abstract
Purpose: The purpose of this paper is to present the results of a research on the importance of Employer Branding (EB) for corporate brand success in the context of small and medium businesses (SME), from the perspective of the employees compared to the founders, considering a set of stable variables. This is an ongoing process through which company employees want to understand "who" and "what" is behind the brand's value proposition. Methodology: A qualitative methodology was used based on interviews with open questions in an exploratory case study, to gather as much information as possible and without constraints. This was properly supported by a literature review, from published works, academic works, as well as papers on employer branding. This approach is part of the scientific paradigm of realism, also known as critical realism, and is therefore an appropriate method in marketing and management research. Findings: The findings of this research demonstrate that EB seems not to be contributing for a successful corporate brand in the SME context. For that purpose, a medium-and long-term marketing and communication plan is needed, particularly regarding a brand plan, duly defined and implemented. The mere market/sector leadership cannot be viewed as a source in the long run for SME. If no one believes or bets on brand equity appreciation, EB won't certainly be potentiated. In this way, there is a risk that this type of organizations would become weak entities with no sense of belonging. Originality/value: Because there is a lack of applied scientific research on this topic in the context of SME, the aim was to understand EB from a specific case study, enabling the acquisition of knowledge on how this concept works and is applied (or not) in practice. Practical implications: This research aimed at contributing to a better strategic alignment of EB, from the institutional level to the operational level, passing through the intermediate level, in SME. It appears that the managers/administrators/directors in SME don't have a holistic perspective of the brand. It also emphasizes the great importance of employees in building the brand in this particular context. Research limitations: This investigation needed a deeper market analysis, namely of direct competitors. It was not possible to obtain enough information to carry out a more reliable analysis. It would be very interesting to understand what led some collaborators to leave the studied company and move to its direct competitors, as well as to realize what makes others leave the competitors or return to the company.

Supervised
thesis

2020

Implementation of Wireless Communication for IoT with Vortex Nano-Oscillators

Author
João Carlos Rodrigues Presa

Institution
UP-FEUP

2020

Printed Electronics Power Supply for IoT Systems

Author
Guilherme José Esteves Pelayo

Institution
UP-FEUP

2020

Micro Fonte de Energia para sistemas IOT em eletrónica impressa

Author
Guilherme José Esteves Pelayo

Institution
UP-FEUP

2020

Active inductor techniques for BW extension

Author
João Pedro Bastos Santos

Institution
UP-FEUP

2019

Design of a low power transmitter for UWB applications

Author
Iman Kianpour

Institution
UP-FEUP