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Andrade M.G.C.D.,Integrated AV Systems | Andrade M.G.C.D.,University of Sao Paulo | Andrade M.G.C.D.,IMEC | Martino J.A.,University of Sao Paulo | And 5 more authors.
Microelectronics Reliability | Year: 2014

In this paper, the influence of proton irradiation is experimentally studied in triple-gate Bulk FinFETs with and without Dynamic Threshold MOS configuration (DTMOS). The drain current, transconductance, Drain Induced Barrier Lowering (DIBL) and the important figures of merit for the analog performance such as transconductance-over-drain current, output conductance and intrinsic voltage gain will be compared. Furthermore, the Low-Frequency (LF) noise will be also analyzed in the DT mode and the standard biasing configuration. The results indicate that the better electrical characteristics and analog performance of DTMOS FinFETs make them very competitive candidates for low-noise RF analog applications in a radiation environment. © 2014 Elsevier Ltd.

Liberado E.V.,University of Campinas | Marafao F.P.,Integrated AV Systems | Simoes M.G.,Colorado School of Mines | Souza W.A.D.,University of Campinas | Pomilio J.A.,University of Campinas
Expert Systems with Applications | Year: 2015

In order to ensure good power quality for modern power systems and/or industrial installations, power conditioning devices have been extensively applied. However, the data analysis for the installation of a determined compensator mainly considers a particular power quality index or disturbance and it is usually based on human expertise. Therefore, this paper proposes a novel expert system that automatically suggests the most appropriate and cost-effective solution for compensating reactive, harmonic and unbalanced current through a careful analysis of several power quality indices and some grid characteristics. Such an expert system is an important tool in real-world applications, where there is a complex scenario in choosing, designing and applying power quality compensators in modern power grids. Since there are no strict boundaries for voltage and current non idealities at distribution level or clear correlation between them and possible solutions, a fuzzy decision-maker was developed to deal with such uncertainties and to embed human expertise in the system. The approach is based on analyzing data from a given time window and providing off-line recommendations for the design and installation of proper compensators. Therefore, the application of the proposed expert system may result in enhanced and faster projects when compared to the traditional design methods for power conditioning. A computational study consisting on applying the suggested compensators for a 5-node network and different load configurations shows the effectiveness of the proposed expert system. © 2014 Elsevier Ltd.

Moreira A.C.,University of Campinas | Paredes H.K.M.,Integrated AV Systems | Da Silva L.C.P.,University of Campinas
Electric Power Systems Research | Year: 2015

This article proposes the use of the conservative power theory as an alternative tool to analyze and determine the possible impacts of noisy loads on electrical distribution systems. The orthogonal decomposition of current (or power) of the conservative power theory allows the definition of different performance factors, each factor represents a specific feature of the load (current lag behind the voltage, unbalance and harmonic distortion). Each factor is used to identify potential effects of the X-ray machine on the system. Furthermore, a computational model developed in PSCAD/EMTDC of the three-phase X-ray machine is presented. The analysis and discussions are based on simulations and actual measurements obtained on the terminals of an X-ray machine. The presented results helps to demonstrate the main advantage of the CPT compared to conventional approaches, which is related to its general application for single phase and poly-phase circuits, for asymmetrical and distorted supply voltages, for nonlinear and unbalanced loads and, for variable line frequency. © 2015 Elsevier B.V. All rights reserved.

De Andrade M.G.C.,Integrated AV Systems | Martino J.A.,University of Sao Paulo | Simoen E.,IMEC | Claeys C.,IMEC | Claeys C.,Catholic University of Leuven
Microelectronic Engineering | Year: 2015

In this paper, the low-frequency (LF) noise in standard n-channel triple-gate Bulk FinFETs has been experimentally investigated with variation in the fin widths (WFin), channel lengths (L) and gate dielectric. The origin of the noise will be analyzed in order to understand the physical mechanisms involved in 3D device architectures. Although the device scaling brings the idea of noise reduction, we show the opposite behavior because already single electron trapping has a marked impact on the device operation. Significant variation in the noise spectral density has been observed, which is related to the random occurrence of excess Lorentzian components (1/f2-like), associated with generation-recombination (GR) noise. In addition, the gate-voltage-dependent GR noise peaks have been studied, which are assigned to gate oxide traps. © 2015 Elsevier B.V.

Marafao F.P.,Integrated AV Systems | Brandao D.I.,University of Campinas | Costabeber A.,University of Nottingham | Paredes H.K.M.,Integrated AV Systems
IET Renewable Power Generation | Year: 2015

ln recent years, the concept of decentralising power generation through the deployment of distributed generators (DGs) has been widely accepted and applied, driven by the growing market of renewable energy sources. These DGs are normally equipped with a switching power interface, acting as front end with the grid. This paper proposes a multi-task control strategy for distributed generation systems that simultaneously allows the DG to inject the available energy, as well as to work as a voltage drop compensator or as an active power filter, mitigating load current disturbances and improving power quality of the grid. The main contribution of the proposed system, with respect to other solutions in the literature, is that the proposed control loops are based on the Conservative Power Theory decompositions. This choice provides decoupled power and current references for the inverter control, offering a very flexible, selective and powerful control strategy for the DG. The paper also discusses the choice of the current waveform for injecting/absorbing active power into/from the grid, and both sinusoidal and resistive references have been compared in terms of damping capability. Finally, simulation and experimental results are provided in order to validate the proposed functionalities of the DG control system. © The Institution of Engineering and Technology 2015.

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