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Ibrahim S.,National University of Ireland | Szczepkowski G.,S3 Group | Farrell R.,National University of Ireland
2014 21st IEEE International Conference on Electronics, Circuits and Systems, ICECS 2014 | Year: 2014

This paper presents a study on different microwave structures used to integrate MEMS devices in printed circuit boards, and their effect on the linear phase response for switched delay lines applications. Three different prototypes were designed to realize the RF tracks required to integrate 0.5 mm pitch MEMS devices together with the meander delay lines. The structures includes: microstrip lines, conventional coplanar waveguides (CPW) and finite grounded coplanar waveguides (FGCPW). The three prototypes were designed to deliver a group delay of 600 ps. Simulations were carried out using CST Microwave Studio. The FGCPW proved to have the highest phase linearity with only ± 4 ps (±0.67%) delay deviations up to 2.7 GHz. The paper also presents the design of two wideband MEMS switched time delay line circuits; one used to provide a fine tuning for the group delay with a step of only 10 ps and another for coarse tuning with 50 ps delay step. Finite grounded coplanar waveguides were selected to obtain a high linearity of phase response. The simulation of the two circuits resulted in a constant delay with relatively small deviations, as well as low insertion and return losses of 0.75 dB and 20 dB, respectively for frequencies up to 5 GHz. © 2014 IEEE.

Figueiredo M.,New University of Lisbon | Goes J.,New University of Lisbon | Goes J.,S3 Group | Oliveira L.B.,New University of Lisbon | Steiger-Garcao A.,New University of Lisbon
International Journal of Circuit Theory and Applications | Year: 2012

A new fully differential self-biased 1.5-bit flash quantizer with built-in threshold voltages, suitable for high speed ADCs and low voltage operation, is described. The proposed circuit is very simple, and simulation results in a 65 nm standard CMOS technology demonstrate that, following the suggested design methodology, it is able to achieve low offset, low kickback noise, low metastability probability errors and fast regeneration time with very low power dissipation. Copyright © 2011 John Wiley & Sons, Ltd.

Moreno P.A.,Technical University of Madrid | Garcia-Pacheco J.L.,Institute Salud Carlos III ISCIII | Charvill J.,Tunstall Healthcare Group | Lofti A.,Nottingham Trent University | And 12 more authors.
Studies in Health Technology and Informatics | Year: 2015

In the context of the long-term care for older adults, informal carers play a key role. Daily competing priorities or a care-skills deficit may lead them to stress, anxiety and/or depression. The iCarer project (AAL-2012-5-239) proposes the design and implementation of a cloud-inspired personalised and adaptive platform which will offer support to informal carers of older adults with cognitive impairment. By means of a holistic approach comprising technologies and services addressing the intelligent and interactive monitoring of activities, knowledge management for personalised guidance and orientation, virtual interaction, e-learning, care coordination facilities and social network services, iCarer aims to reduce the informal carer stress and to enhance the quality of care they provide, thus improving their quality of life. The iCarer platform will be evaluated through a multi-centre non-controlled study (4 months; 48 homes located in England and in Slovenia). Currently the iCarer project is completing the development work. The evaluation trial is expected to start in August 2015. © 2015 European Federation for Medical Informatics (EFMI).

Mountjoy J.,University College Dublin | Walsh A.J.,Dublin City University | Cardiff B.,S3 Group | O'dowd J.A.,FAZTech Research Ltd | And 4 more authors.
Optics InfoBase Conference Papers | Year: 2013

We examine data transmission during the interval immediately after wavelength switching of a tunable laser and, through simulation, we demonstrate how choice of modulation format can improve the efficacy of an optical burst/packet switched network. © 2013 Optical Society of America.

Figueiredo M.,New University of Lisbon | Santos-Tavares R.,New University of Lisbon | Santin E.,New University of Lisbon | Ferreira J.,New University of Lisbon | And 2 more authors.
IEEE Transactions on Circuits and Systems I: Regular Papers | Year: 2011

A two-stage fully differential CMOS amplifier comprising inverters as input structures and employing self-biasing techniques is presented. The proposed amplifier benefits from an optimum compensation through time-domain optimization which permits achieving high energy efficiency. Moreover, it achieves the highest efficiency of its class and although it relies on a quasi-class-A topology, it is comparable to class-AB amplifiers. Detailed circuit analyses such as differential-mode, common-mode feedback, noise, slew rate, and input/output range are carried out. Based on these analyses, a manual design methodology and a genetic algorithm based optimization are presented. Finally, the most relevant experimental results for an integrated circuit prototype designed in a 0.13 μm 1.2 V standard CMOS technology are shown. © 2011 IEEE.

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