Publications

Publications by CTM

2008

Gestão de recursos multi-rádio com renegociação e re-alocação de chamadas

Authors
Monego, HID; Oliveira, JM; Ricardo, M;

Publication
Iberian Conference on Information Systems and Technologies, CISTI

Abstract

2008

Resource Management in Multi-Radio Renegotiation and Re-allocation calls.

Authors
Del Monego, HI; Oliveira, JM; Ricardo, M;

Publication
ACTAS DE LA III CONFERENCIA IBERICA DE SISTEMAS Y TECNOLOGIAS DE LA INFORMACION, VOL 2

Abstract

2008

A project driven digital design course using FPGAs

Authors
Araujo, AJ; Alves, JC;

Publication
19th EAEEIE (European Association for Education in Electrical and Information Engineering) Annual Conference - Formal Proceedings

Abstract
This paper presents a project based teaching experience in an advanced digital systems design course with emphasis on design methodologies and laboratory assignments. Projects are the core of the practised teaching methodology and are structured in a pedagogical format according to the course programme. The use of the FPGA technology as the most suitable implementation technology for digital design teaching purposes is discussed. The course structure, oriented to the development of real working digital systems, challenges the students and increases their motivation. This way, the learning process is improved and the classes are more productive. A laboratory development infrastructure based on a FPGA device, used to implement a real-time video processing system, is presented. Examples of laboratory projects implemented with this infrastructure in a recent course edition are also presented. © 2008 IEEE.

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2008

Selected Papers from the International Mixed Signals Testing and GHz/Gbps Test Workshop

Authors
Kaminska, B; Lubaszewski, M; Machado da Silva, J;

Publication
VLSI Design

Abstract

2008

An Adaptive Scheme for Estimating and Correcting RF Amplifiers' Non-linearities

Authors
Mota, PF; da Silva, JM; Long, J;

Publication
2008 IEEE ASIA PACIFIC CONFERENCE ON CIRCUITS AND SYSTEMS (APCCAS 2008), VOLS 1-4

Abstract
An adaptive amplifier scheme is presented which allows for estimating and correcting the behaviour of a non-linear amplifier, in order to improve its performance for RF communication. This is attained configuring its operating mode in one of estimation of the amplifier's non-linearity, automatic gain control, and correction of eye diagrams' opening. The theory behind these three operating modes is explained first using simulation results obtained with a behavioural model. Experimental results, obtained with a proof-of-concept prototype, which validate the functional correctness in these three modes are also presented. Issues concerning implementation requirements and limitations are discussed.

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2008

A pull-in based test mechanism for device diagnostic and process characterization

Authors
Rocha, LA; Mol, L; Cretu, E; Wolffenbuttel, RF; MacHado Da Silva, J;

Publication
VLSI Design

Abstract
A test technique for capacitive MEMS accelerometers and electrostatic microactuators, based on the measurement of pull-in voltages and resonance frequency, is described. Using this combination of measurements, one can estimate process-induced variations in the device layout dimensions as well as deviations from nominal value in material properties, which can be used either for testing or device diagnostics purposes. Measurements performed on fabricated devices confirm that the 250nm overetch observed on SEM images can be correctly estimated using the proposed technique.

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