Dionisio Carvalho

Dr. Dionisio Carvalho

orcid

Research Focus & Metrics

Academic Career Length

14Years (2013-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

View All Publications
1 April 2017 in Journal of Instrumentation
Verified
Journal Article
Closed access
PDF file
JAJ. Adolfsson
J. Adolfsson
APA. Ayala Pabon
A. Ayala Pabon
MBMarco Bregant
Marco Bregant
CBC. Britton
C. Britton
GBG. Brulin
G. Brulin
SZS. Zaporozhets
S. Zaporozhets

25 July 2019 in IEEE Transactions on Instrumentation and Measurement
Verified
Journal Article
Closed access
HHHugo Hernandez
Hugo Hernandez
BSBruno Cavalcante de Souza Sanches
Bruno Cavalcante de Souza Sanches
DCDionisio Carvalho
Dionisio Carvalho
MBMarco Bregant
Marco Bregant
APArmando Ayala Pabon
Armando Ayala Pabon
WNWilhelmus Van Noije
Wilhelmus Van Noije

13 December 2024 in IEEE Access
Verified
Journal Article
Open access
AAAlexandre de Jesus Aragão
Alexandre de Jesus Aragão
DCDionisio Carvalho
Dionisio Carvalho
BSBruno Sanches
Bruno Sanches
WNWilhelmus A. M. van Noije
Wilhelmus A. M. van Noije
Breast cancer is currently the most often diagnosed tumour for women. Providing a safe and accurate imaging technique for early detection is one of the mains focuses on different research groups. Microwave Imaging has emerged as a complementary modality among mammography and ultrasound. It is capable of identifying a millimetre size tumour inner even in a dense breast. However, it has a limited spatial resolution and is sensitive to artefacts that can degrade the image quality. The challenge of this technique lies in a system design targeting operational frequency range that guarantees repeatability, with specificity and sensitivity values taking to positive impacts on the exam results, for future acceptance and clinical use. This paper aimed to depict the unfolded systems that employ the microwave technique and describe their apparatus solutions and key features. It is a review that focuses on practical results and highlights those that are the most advanced. In addition, a comprehensive review of the literature on Microwave Imaging and systems is presented. Since there is no consensus on the best apparatus configuration, linked to the fact that only some research groups have stated clinical results with patients employing their device, the question of clinical acceptance of Microwave Imaging in breast cancer detection is raised and discussed. Yet, some systems have reported astonishing practical results that were presented and compared with other modalities, and due to this, we recommend continued efforts for the broader application of this technique in breast cancer detection.

1 May 2017
Verified
Conference Paper
Closed access
HHHugo Hernandez
Hugo Hernandez
DCDionisio Carvalho
Dionisio Carvalho
BSBruno Sanches
Bruno Sanches
LSLucas C. Severo
Lucas C. Severo
WNWilhelmus Van Noije
Wilhelmus Van Noije
This work presents the design and experimental results of a current mode Scalable Low-Voltage Signaling (SLVS) transceiver in 130 nm CMOS technology. The proposed transmitter includes a feedback control which reduces the common-mode voltage variations in terms of the Vds voltage of the bias transistor, and an enable/disable operation mode, which minimizes the power consumption when data transmission is not requested. A rail-to-rail comparator topology was used to design the receiver circuit being robust to transient common-mode variations with low power consumption and high speed. The experimental DC power consumption of the transceiver is 4.6 mW at 1.25V power supply, where 1.1 mW is consumed by the receiver and 3.5 mW by the transmitter. The eye diagram proves the proper dynamic operation of the circuit until a data rate of 1.2Gbps.

1 March 2018
Verified
Conference Paper
Closed access
DCDionisio Carvalho
Dionisio Carvalho
BSBruno Sanches
Bruno Sanches
MCM. De Carvalho
M. De Carvalho
WNWilhelmus Van Noije
Wilhelmus Van Noije
Technology scaling made possible to increase IC capabilities from one node to the next by adding more transistors within the same die area while keeping a low pin count. As a consequence, test complexity increased exponentially, requiring engineers to use not only better test pattern generation software, but also powerful and expensive Automatic-Test-Equipments (ATE), usually not viable and accessible for small fabless start-ups and universities. In this work, we propose a low-cost and flexible ATE intended for manufacturing tests of the digital part of a multi-million gate industrial mixed signal ASIC produced in a 130nm technology that will be used at CERN in the ALICE experiment. The proposed ATE was built upon a ready-to-use platform including an embedded ARM-based processor and a FPGA to effectively apply the test vectors via the Device-Under-Test (DUT) scan chains in a feasible time and viable cost without the need for a PC. The ATE was operated to execute in-series manufacturing tests on two versions of the SAMPA chip, allowing identifying on-silicon defects.

1 November 2021 in Microprocessors and Microsystems
Verified
Journal Article
Closed access
DCDionisio Carvalho
Dionisio Carvalho
AAAlexandre J. Aragão
Alexandre J. Aragão
BSBruno Sanches
Bruno Sanches
HHHugo Daniel Hernandez
Hugo Daniel Hernandez
WNWilhelmus Van Noije
Wilhelmus Van Noije