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389 results on '"Paulino, Nuno"'

152. Switched-capacitor multiply-by-two amplifier insensitive to component mismatches

Author

Goes, Joao, Pereira, Joao Cardoso, Paulino, Nuno, and Silva, Manuel Medeiros

Subjects
Switched capacitor circuits -- Design and construction, Amplifiers (Electronics) -- Design and construction, Circuit design -- Analysis, Circuit designer, Integrated circuit design, Business, Computers and office automation industries, Electronics, Electronics and electrical industries
Abstract

This brief describes a new mismatch-insensitive amplifier with an accurate gain of two and with the parasitic effects compensated. It is based on associating four sets of two capacitors in series during the amplification phase. The amplifier operates within a single clock cycle and uses only one amplifier. A detailed study of the different nonideal effects is presented. Simulated results demonstrate that a gain accuracy enhancement of the order of 4-5 bits can be achieved with respect to conventional realizations. Index Terms--Mismatch-insensitive amplifier, multiply-by-two amplifier (MBTA), switched-capacitor (SC) circuits.

Published
2007

166. Relatório final de estágio realizado na Escola Secundária Braamcamp Freire

Author

Paulino, Nuno Alexandre Francisco Rocha and Ferro, Nuno Alberto Seruca

Subjects
Comunidade escolar, Reflexão critica, Skills development, Desenvolvimento de competências, Physical Education, Estágio pedagógico, Reflection, School community, Pedagogical internship, Ensino da Educação Física, Ciências Sociais [Domínio/Área Científica]
Abstract

O presente relatório tem como objetivo apresentar uma reflexão crítica e projetiva sobre as práticas desenvolvidas no estágio pedagógico em Educação Física, realizado na Escola Secundária Braamcamp Freire, na Pontinha, durante o ano letivo 2016/2017. Para a concretização deste propósito formativo há que salientar as diferentes áreas de intervenção do estágio no modo como possibilitaram o crescimento profissional através da lecionação de aulas de Educação Física, do acompanhamento de um diretor de turma, da participação num núcleo de desporto escolar e da intervenção no contexto escolar através de um projeto de investigação-ação. Ao longo do relatório serão dados a conhecer os diferentes níveis de participação e intervenção expondo as maiores dificuldades sentidas e as estratégias utilizadas para superar cada situação, na certeza que cada momento vivenciado ao longo do ano letivo contribuiu de forma inequívoca para a formação do meu perfil docente. Este estágio pedagógico consolidou uma visão quanto ao papel que o professor deve ter, não apenas na gestão do processo de ensino-aprendizagem da sua disciplina, mas também em todo o processo educativo promovido pela comunidade escolar. Para tal é imprescindível encarar a formação inicial como um processo que tem o seu término, mas que deve representar um ponto de passagem face à necessidade que a carreira docente apresenta de estarmos em contante atualização de forma a potenciar o sucesso educativo dos alunos. The current report aims to presente a critical reflection on the pedagogical internship implemented in the Physical Education (PE) teacher training, that took place at the Secondary School of Braamcamp Freire, in Pontinha, during the academy year 2016/2017. Concerning the teacher training achievement, one most emphasise its core áreas and lay stress on the professional growth it enabled through the teaching os PE classes, the monitoring of the class along with the class director, the participation in a Sports School Centre and finally the intervention in the school context according to na investigation-action project applied. The report will expose diferente levels of participations and it will unveil the most significant difficulties and the strategies used to overcome them, However, it must be highlighted that each experience lived during this academic year has contributed undoubtedly to my formation as teacher. This pedagogical training consolidated not only the importance of the teacher’s role in the learning teaching process, but also in the educational process endorsed by the school community. Therefore, one must face basic training as na essential procedure. Nonetheless, one must also bear in mind that teaching requires constant pedagogical updates in order to promote the educational success of students.

Published
2019

172. Improving Performance and Energy Consumption in Embedded Systems via Binary Acceleration: A Survey.

Author

PAULINO, NUNO, FERREIRA, JOÃO CANAS, and CARDOSO, JOÃO M. P.

Subjects
*PARALLEL processing, *ENERGY consumption, *MULTICORE processors, *PARALLEL programming, *BINARY codes
Abstract

The breakdown of Dennard scaling has resulted in a decade-long stall of the maximum operating clock frequencies of processors. To mitigate this issue, computing shifted to multi-core devices. This introduced the need for programming flows and tools that facilitate the expression of workload parallelism at high abstraction levels. However, not all workloads are easily parallelizable, and the minor improvements to processor cores have not significantly increased single-threaded performance. Simultaneously, Instruction Level Parallelism in applications is considerably underexplored. This article reviews notable approaches that focus on exploiting this potential parallelism via automatic generation of specialized hardware from binary code. Although research on this topic spans over more than 20 years, automatic acceleration of software via translation to hardware has gained new importance with the recent trend toward reconfigurable heterogeneous platforms. We characterize this kind of binary acceleration approach and the accelerator architectures on which it relies. We summarize notable state-of-the-art approaches individually and present a taxonomy and comparison. Performance gains from 2.6× to 5.6× are reported, mostly considering bare-metal embedded applications, along with power consumption reductions between 1.3× and 3.9×. We believe the methodologies and results achievable by automatic hardware generation approaches are promising in the context of emergent reconfigurable devices. [ABSTRACT FROM AUTHOR]

Published
2021
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173. Transistor‐level optimization methodology for the complete design of switched‐capacitor filter circuits.

Author

Serra, Hugo, Santos‐Tavares, Rui, and Paulino, Nuno

Subjects
TRANSISTORS, FILTERS & filtration, DIFFERENTIAL equations, GENETIC algorithms, TRANSFER functions, COMPUTER systems
Abstract

Summary: This paper presents an automatic procedure for the design and optimization of switched‐capacitor (SC) filters, including the automatic sizing of transistors in the amplifiers and switches. The optimization procedure is based on genetic algorithms (GAs) where the circuit's fitness is first computed using equations describing the filter's transfer function and then using transient simulations. These equations are obtained using a fast numerical methodology that takes into consideration the electrical behavior of all components in the circuit. The poles and zeros of the SC filter's transfer function are computed using a system of differential equations, obtained from the inspection of the circuit. This system describes the filter's behavior for all switch combinations, including the non‐ideal effects of the transistors in the switches and amplifiers. Due to the low computational effort and accuracy of this methodology, it is possible to use a large population in the GA. After finding a solution through equations, the more computationally intensive SPICE transient simulations are used to fine‐tune the solution, with a much smaller population in the GA. Taking advantage of the equations' low computational load and accuracy, process, voltage, temperature (PVT) corners and mismatch errors optimizations are also performed, allowing the chromosomes fitness to be calculated taking into consideration multiple cases, thus resulting in a low sensitivity design. [ABSTRACT FROM AUTHOR]

Published
2021
Full Text
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174. Basic research in phonology, resources and applications: the case of frequency

Author

Vigário, Marina, Martins, Fernando, Cruz, Marisa, Paulino, Nuno, Frota, Sónia, and Repositório da Universidade de Lisboa

Subjects
Português, Frequência fonológica, Recursos linguísticos
Abstract

É crescente a valorização da conversão do conhecimento fundamental desenvolvido pelos cientistas em produtos concretos, socialmente relevantes. No Laboratório de Fonética da Universidade de Lisboa tem-se trabalhado nos últimos anos tanto em domínios de investigação fundamental, como de investigação aplicada. Neste artigo é feita uma revisão dos principais recursos recentemente disponibilizados à comunidade por este Laboratório visando o acesso a informação sobre frequência fonológica e lexical. São sumariamente apresentados, em particular, as aplicações informáticas para extração de informação de frequência fonológica e lexical FreP (V2016) e FreLex, a base de dados alargada FrePOP (agora sobre um corpus de cerca de 2 milhões de palavras), e 3 novos léxicos, o FrePOP Lexicon (frequência lexical num corpus de 3 milhões de palavras), o PLEX5 – Um léxico Infantil para o Português Europeu e o CDS_EP – Frequência lexical nos dados de fala dirigida à criança da FrePOP (0;11 a 3;04 ). São ainda revistos estudos recentes que fizeram uso destes recursos, ilustrando a sua utilidade em domínios de investigação fundamental e aplicada.

Published
2017

175. Fenómenos de sândi vocálico em variedades do português europeu

Author

Paulino, Nuno Miguel Ribeiro and Frota, Sónia

Subjects
Língua portuguesa - Variação linguística, Teses de mestrado - 2016, Língua portuguesa - Fonologia, Linguística, Humanidades::Línguas e Literaturas [Domínio/Área Científica], Língua portuguesa - Prosódia (Linguística)
Abstract

Submitted by Manuel Moreno (manuelmoreno@campus.ul.pt) on 2017-01-19T11:48:43Z No. of bitstreams: 1 ulfl221664_tm.pdf: 2591088 bytes, checksum: 9005b2fb254a6c56fafe4085c4ed9389 (MD5) Made available in DSpace on 2017-01-19T11:48:54Z (GMT). No. of bitstreams: 1 ulfl221664_tm.pdf: 2591088 bytes, checksum: 9005b2fb254a6c56fafe4085c4ed9389 (MD5) Previous issue date: 2016

Published
2016

189. A 1.2-V 165-μW 0.29-mm² Multibit Sigma-Delta ADC for Hearing Aids Using Nonlinear DACs and With Over 91 dB Dynamic-Range

Author

Custódio, José R., Goes, João, Paulino, Nuno, Oliveira, João P., and Bruun, Erik

Subjects
SDG 3 - Good Health and Well-being, Hardware_INTEGRATEDCIRCUITS
Abstract

This paper describes the design and experimental evaluation of a multibit Sigma-Delta (ΣΔ) modulator (ΣΔM) with enhanced dynamic range (DR) through the use of nonlinear digital-to-analog converters (DACs) in the feedback paths. This nonlinearity imposes a trade-off between DR and distortion, which is well suited to the intended hearing aid application. The modulator proposed here uses a fully-differential self-biased amplifier and a 4-bit quantizer based on fully dynamic comparators employing MOS parametric pre-amplification to improve both energy and area efficiencies. A test chip was fabricated in a 130 nm digital CMOS technology, which includes the proposed modulator with nonlinear DACs and a modulator with conventional linear DACs, for comparison purposes. The measured results show that the ΣΔM using nonlinear DACs achieves an enhancement of the DR around 8.4 dB (to 91.4 dB). Power dissipation and silicon area are about the same for the two cases. The performance achieved is comparable to that of the best reported multibit ΣΔ ADCs, with the advantage of occupying less silicon area (7.5 times lower area when compared with the most energy efficient ΣΔM).

Published
2013

190. Continuous-Time Delta-Sigma Modulators Based on Passive RC Integrators.

Author

de Melo, Joao L. A., Paulino, Nuno, and Goes, Joao

Subjects
*CONTINUOUS-time filters, *INTEGRATORS, *ELECTRIC resistors
Abstract

Due to the emerging systems with constraints in terms of power and costs, such as smart sensor interfaces for the Internet-of-Things, the design of the ADCs becomes very challenging. In this paper, energy and area efficient techniques for continuous-time (CT) delta-sigma modulators ($\Delta \Sigma $ Ms) are discussed. These techniques are based on increasing the contribution of the 1-bit comparator to the loop gain by using passive RC integrators together with low gain amplifiers in the $\Delta \Sigma \text{M}$ loop filter. A third-order CT $\Delta \Sigma \text{M}$ is designed using these techniques to demonstrate their validity, and it achieves 27.5 fJ/conv.-step of energy efficiency. Due to the many design issues, such as the tradeoff between RC variations and loop stability, the design of this modulator has been optimized using a genetic algorithm. The 65-nm CMOS $\Delta \Sigma \text{M}$ occupies only $0.013~\mathrm {mm^{2}}$ , dissipates 256 $\mu \text{W}$ from a 0.7-V supply and it achieves a peak SNDR of 69.1 dB in a 2-MHz bandwidth. The dynamic range reaches 76.2 dB, which corresponds to a $\mathrm {FoM_{Schreier}}$ of 175.1 dB. [ABSTRACT FROM AUTHOR]

Published
2018
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191. Liderança e estratégias de gestão de conflitos

Author

Paulino, Nuno Miguel Murteira and Pissarra, João

Subjects
Leadership styles, Estratégias de gestão de conflitos, Estilos de liderança, Military context, Contexto militar, Conflict management strategies
Published
2012

192. A DC-DC Step-Up mu-Power Converter for Energy Harvesting Applications, Using Maximum Power PointTracking, Based on Fractional Open Circuit Voltage

Author

Carvalho, Carlos, Lavareda, Guilherme, and Paulino, Nuno

Subjects
Maximum Power Point Tracking, Energy Harvesting, Power Management Circuits, Electronics, CMOS Circuits, Amorphous Silicon Solar Cell
Abstract

Submitted by Fátima Piedade (fpiedade@sa.isel.pt) on 2013-01-25T12:02:49Z No. of bitstreams: 1 A DC-DC Step-Up mu-Power Converter for Energy Harvesting Applications, Using Maximum Power PointTracking, Based on Fractional Open Circuit Voltage.rep.pdf: 197771 bytes, checksum: b84dff820d6e002b44d737c1ccd4460c (MD5) Made available in DSpace on 2013-01-25T12:02:49Z (GMT). No. of bitstreams: 1 A DC-DC Step-Up mu-Power Converter for Energy Harvesting Applications, Using Maximum Power PointTracking, Based on Fractional Open Circuit Voltage.rep.pdf: 197771 bytes, checksum: b84dff820d6e002b44d737c1ccd4460c (MD5) Previous issue date: 2012

Published
2012

193. A Step-up mu-Power Converter for Solar Energy Harvesting Applications, using Hill Climbing Maximum Power Point Tracking

Author

Carvalho, Carlos, Lameiro, José, Paulino, Nuno, and Lavareda, Guilherme

Subjects
Step-up mu-Power Converter, Hill Climbing Maximum Power Point Tracking, Solar Energy Harvesting Applications
Abstract

Submitted by Fátima Piedade (fpiedade@sa.isel.pt) on 2013-01-25T12:44:19Z No. of bitstreams: 1 A Step-up mu-Power Converter for Solar Energy Harvesting Applications, using Hill Climbing MaximumPower Point Tracking.rep.pdf: 193211 bytes, checksum: 42725df66b42b6fdab94f8df94fe923a (MD5) Made available in DSpace on 2013-01-25T12:44:19Z (GMT). No. of bitstreams: 1 A Step-up mu-Power Converter for Solar Energy Harvesting Applications, using Hill Climbing MaximumPower Point Tracking.rep.pdf: 193211 bytes, checksum: 42725df66b42b6fdab94f8df94fe923a (MD5) Previous issue date: 2011

Published
2011

194. Generation of reconfigurable circuits from machine code

Author

Paulino, Nuno Miguel Cardanha, Ferreira, João Paulo de Castro Canas, Cardoso, João Manuel Paiva, and Universidade do Porto. Faculdade de Engenharia

Subjects
Código de máquina, Geração de circuitos reconfiguráveis
Abstract

Tese de mestrado integrado. Engenharia Electrotécnica e de Computadores. Telecomunicações. Universidade do Porto. Faculdade de Engenharia. 2011

Published
2011

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