Repositório do Conhecimento Institucional do Centro Universitário FEI
 

Engenharia Elétrica

URI permanente desta comunidadehttps://repositorio.fei.edu.br/handle/FEI/21

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2011 - 20134

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Assunto: search.filters.subject.Analog integrated circuit

Resultados da Pesquisa

Agora exibindo 1 - 4 de 4
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    Artigo de evento 5 Citação(ões) na Scopus
    AGSPICE: A new analog ICs design tool based on evolutionary electronics used for extracting additional design recommendations
    (2012) DE LIMA, MORETO R. A.; THOMAZ, C. E.; Salvador Gimenez
    Analog integrated circuits (ICs) design is a complex task due to the large number of input variables that must be determined simultaneously in order to achieve different multiple design goals of an analog integrated circuit design, such as voltage gain (A V), unit voltage gain frequency (f T), slew-rate (SR), harmonic distortion (THD), etc. By using an evolutionary system based on Genetic Algorithm (AG) integrated to the SPICE simulator, named AGSPICE, this work aims to study, understand and calculate the different correlations between the MOSFETs inversion regimes and the design goals of an operational transconductance amplifier (OTA) operating in different design features. We believe that the AGSPICE can provide new design recommendations for the designers and reduce the design cycle time as well. Our experimental results with the AGSPICE are also compared to the results obtained manually and present compatible solutions to other works available in the related literature. © 2012 IEEE.
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    Artigo 3 Citação(ões) na Scopus
    OTA design by means of an evolutionary system integrated to SPICE Projeto de um OTA cmos por meio de um sistema evolucionário integrado ao SPICE
    (2012) DE LIMA, MORETO, R. A.; DO REGO, T. T.; LEME, A. P. M.; THOMAZ, C. E.; Salvador Gimenez
    Analog integrated circuits design is a complex task due to the large number of input variables to be determined simultaneously in order to comply with innumerable design features of an analog integrated circuit design. This work describes and implements an evolvable system based on Genetic Algorithms (GA) which was computationally integrated to the simulation program SPICE and has the capability to search for solutions that best comply with the designer specified objectives. The simultaneous evaluation of the input variables allows the proposed system (AGSPICE) to track the changes of these variables along the optimization process and its understanding in a clearer way. Our experimental results with the AGSPICE applied to an Operational Transconductance Amplifier (OTA) CMOS design are compared to the results obtained manually and present compatible solutions to other works available in the related literature.
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    Artigo de evento 10 Citação(ões) na Scopus
    Analysis of a new evolutionary system elitism for improving the optimization of a CMOS OTA
    (2013-09-11) DE LIMA MORETO, R. A.; Salvador Gimenez; THOMAZ, C. E.
    Analog integrated circuits design is a complex task due to the large number of input variables that must be determined in order to achieve different design goals such as voltage gain, unit voltage gain frequency, phase margin and dissipated power. This paper describes and implements an evolutionary optimization solution based on genetic algorithms and the well-known SPICE simulator, named 'AGSPICE/FEI', with current industry standard BSIM3v3 model that has the capability of searching solutions that better comply with the multiple design goals specified a priori of a single-end, single-stage operational transconductance amplifier (OTA). The AGSPICE/FEI can provide a large set of solutions allowing the designer to choose the best solutions, which fully meet the design goals, and, thus, analyze the performance obtained by the modified genetic algorithm, which performs two types of elitism: one conventional and another non-conventional. This paper performs the study of the performance of the non-conventional elitism by comparing the performance achieved by several different groups, in which in one of them is applied only the conventional elitism and in the other groups are applied the non-conventional elitism in different settings. The results have been analyzed for different design specifications. The experimental results have demonstrated that this new elitism stage is able to increase the speed of the AGSPICE/FEI searching process and also might provide solutions that better suit the design goals. © 2013 IEEE.
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    Artigo 20 Citação(ões) na Scopus
    FISH SOI MOSFET: Modeling, characterization and its application to improve the performance of analog ICs
    (2011) Gimenez S.P.; Alati D.M.; Simoen E.; Claeys C.
    This paper is conceptual and introduces a new transistor layout style called FISH SOI MOSFET (FSM). It is an evolution of the Diamond device (DSM) and specially designed to preserve the Longitudinal Corner Effect (LCE) to increase the resultant longitudinal electric field along the channel, that results in an improvement in the average carrier drift velocity in the channel. It presents a gate geometric shape similar to a n"smaller than" (<) mathematical symbol. Unlike the DSM, the FISH layout style brings an innovative possibility in the "lengthening of its effective channel length, defined as Lengthening of Effective Channel Length Effect (LECLE)", keeping the channel length with the minimum dimension allowed by the SOI CMOS process technology used in manufacturing digital ICs applications. It can reduce the die area of digital ICs by using the LECLE of the FISH layout structure style by combining conventional SOI pMOSFETs and FISH nMOSFETs. Thanks to the FSM LECLE, one also can reduce the die area of the current mirrors of analog integrated circuits. For the first time, it is shown that LECLE in the FSM structure is able to increase the Early voltage and consequently to improve significantly the voltage gain of analog ICs. © 2011 The Electrochemical Society.