Digital Circuits Simulation
Mostrando 1-12 de 18 artigos, teses e dissertações.
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1. Modeling and simulation of device variability and reliability at the electrical level
In nanometer scale complementary metal-oxide-semiconductor (CMOS) parameter variations pose a challenge for the design of high yield integrated circuits. This work presents models that were developed to represent physical variations affecting Deep- Submicron (DSM) transistors and computationally efficient methodologies for simulating these devices using Elec
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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2. DIVISORES DE FREQÜÊNCIA POR DOIS PARAMÉTRICOS BALANCEADOS A PHEMT PARA RECEPTORES DE DEFESA ELETRÔNICA / PHEMT BALANCED PARAMETRIC FREQUENCY DIVIDER BY TWO FOR ELECTRONIC DEFENSE RECEIVERS
This work assesses the development of PHEMT balanced parametric frequency dividers by two, intended for application as frequency converters on Electronic Defense digital receivers. The main characteristics of these devices are design simplicity, reduced number of components, possibility of integration in MMIC, phase coherence, wide bandwidth, very good pulse
Publicado em: 2009
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3. Circuitos integrados de radio-recepção para a operação de multiplexação espacial de antenas em tempo real / Integrated circuits of radio-reception for spatial multiplexing of antennas in real time
This research aims the conception of new topologies of integrated circuits and its characterizations for operation in radio-receiver systems. The design and fabrication of RF switches, LNAs, mixer, and VCOs are presented. The SMILE - Spatial MultIplexing of Local Elements - technique was adopted due to its advantages and functionality for the intelligent ant
Publicado em: 2008
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4. Frequency synthesizers of 2.4 GHz from CMOS with 0.35 µm for ZigBee applications. / Sintetizador de freqüências de 2,4 GHz em CMOS, 0,35 µm para aplicações em ZigBee.
Frequency Synthesizers are circuits that generate pre-determined frequencies, used in both radio frequency reception and transmission. The Synthesizer circuits are composed by several blocks, such as Voltage-Controlled Oscillator (VCO), Prescaler, PFD (Phase/Frequency Detector), Charge Pump (CP), and Low Pass Filters (LPF). In 2003, an Integer-N architecture
Publicado em: 2008
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5. Hardware evolutivo aplicado a geração automatica de controladores para servo-mecanismos / Evolvable hardware applied to automatic design of servomecanisms
In the last decade evolutionary algorithms application in electronic circuits synthesis have been intensively investigated, starting a new research area called Evolvable Hardware. This thesis considers the use of Evolvable Hardware as a tool for automatic design of circuits applied to the control of a nonlinear damped pendulum. Initially a study on the use o
Publicado em: 2007
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6. Mixed-signal analog-digital circuits design on the pre-diffused digital array using trapezoidal association of transistors
The mixed-signal and analog design on a pre-diffused array is a challenging task, given that the digital array is a linear matrix arrangement of minimum-length transistors. To surmount this drawback a specific discipline for designing analog circuits over such array is required. An important novel technique proposed is the use of TAT (Trapezoidal Association
Publicado em: 2007
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7. Mutually connected DPLL networks: modelling, simulation and optimization. / Redes mutuamente conectadas de DPLLs: modelagem, simulação e otimização.
Clock-distribution is an essential feature in many engineering applications as, for example, telecommunications networks and digital integrated circuits. In the last few decades this problem was predominantly addressed using master-slave strategies. In this type of strategy there are precise reference oscillators in the network called masters and their signa
Publicado em: 2007
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8. Projeto de um inversor trifásico com snubber de undeland regenerativo e controle digital implementado no DSP TMS320F2812
This work deals with the design and implementation of the digital instantaneous averaged values control for output voltages of the three-phase inverter with Underlands snubber, using the Buck-Boost converter for regeneration of the snubbers energy. The qualitative and quantitative analysis of the inverter power structure, snubber and auxiliary converter, as
Publicado em: 2007
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9. TDMoIP as an alternative for broadcasting in IPTV applications / Uso de TDMoIP como alternativa para broadcasting em aplicações IPTV
This work presents new technologies for TDM emulation over packet networks, as an alternative to VoIP applications, saving network investments. After that, it proposes TDM pseudo-wires as an option to reduce digital video transmission costs, introducing a new kind of IPTV application. The work proposes new algorithms to improve solutions to TDM over IP main
Publicado em: 2006
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10. Projeto de um retificador de corrente reversível com alto fator de potência e controle digital implementado em DSP
The target of this work is the design and assembly of a reversible current rectifier with high power factor, by current control using the instantaneous values. The control is made by one Digital Signal Processor (DSP). Though many studies already have been made in this area, this field is recently between the UDESCs research, So, this works contributions is
Publicado em: 2005
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11. Localização de faltas em linhas de transmissão utilizando a teoria de ondas viajantes e transformada Wavelet / Fault Location in Transmission Lines Using Traveling Waves and Wavelet Transform Theory
This work presents a wavelet transform (WT) application to analyze the high frequency transients in a transmission line caused by a fault, with the purpose of determining its accurate location. The WT is very similar to Fourier Transform (FT), with an important difference: it allows the time determination of different frequency components of a signal. This s
Publicado em: 2003
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12. Digital control of plasma position in damavand tokamak
Plasma position control is one of the important issues in the design and operation of tokamak fusion research device. Since a tokamak is basically an electrical system consisting of power supplies, coils, plasma and eddy currents, a model in which these components are treated as an electrical circuits is used in designing Damavand plasma position control sys
Brazilian Journal of Physics. Publicado em: 2002-03