Mixed Signal Systems
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Design of self-checking fully differential circuits and boards
A design methodology for on-line testing analog linear fully differential (FD) circuits is presented in this work. The test strategy is based on concurrently monitoring via an analog checker the common mode (CM) at the inputs of all amplifiers. The totally self-checking (TSC) goal is achieved for linear FD implementations provided that the checker CM thresho
Publicado em: 2011
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2. Desconvolução não supervisionada por filtros de erro de predição não lineares e recorrentes e sistemas imunologicos artificiais / Unsupervised deconvolution by nonlinear recurrent prediction-error filters and artificial immune systems
When data is transmitted trough a channel, it may be subject to several sorts of distortion that might cause unacceptable level of degradation. A very usual type of distortion is the intersymbol interference ,which is a consequence of the temporal spread of the information-bearing signal .To mitigate this interference ,it is usual to employ an equalizer ,whi
Publicado em: 2010
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3. ANÁLISE DE COMPONENTES INDEPENDENTES APLICADA EM DISTÚRBIOS DE QUALIDADE DE ENERGIA
This dissertation presents the development of a technique for power quality analysis, considering the case of multiple disturbances. The purpose is to separate the disturbances that are occurring in sequence or at the same time, in voltage signals of the electric power systems. For this, is used the philosophy of blind source separation, with the assumption
Publicado em: 2009
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4. A Modular and digitally programmable interface based on band-pass sigma-delta modulator for mixed-signal systems-on-chip
O foco desta tese é a descrição e validação de uma arquitetura de interface para processamento de sinais analógicos para SOC de sinais mistos. A abordagem proposta apresenta a possibilidade de cobertura de uma larga faixa de freqüências com performance praticamente constante associada a uma estrutura digital de programação. A premissa é usar uma c
Publicado em: 2007
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5. Planejamento de teste de sistemas baseados em núcleos de hardware de sinal misto usando bist
Atualmente, os sistemas eletrônicos integrados seguem o paradigma do projeto baseado em núcleos de hardware. Além de núcleos digitais, tais sistemas podem incluir núcleos analógicos, que, neste caso, dominam os requisitos de teste, como tempo de teste e número adicional de pinos. Consequentemente, há um aumento do custo total de manufatura do disposi
Publicado em: 2007
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6. Digital approach for the design of statistical analog data acquisition on SoCs / Uma abordagem digital para o projeto de aquisição estatística de dados analógicos em sistemas Integrados (SoCs).
With the current demand for mixed-signal SoCs, an increasing number of designers are looking for ADC architectures that can be easily implemented over digital substrates. Since ADC performance is strongly dependent upon physical and electrical features, it gets more difficult for them to benefit from more recent technologies, where these features are more va
Publicado em: 2005
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7. Mixed H2 / H Infinity control through linear inequalities for flexible structures vibration reduction / Controle H2 / H Infinito via desigualdades matriciais lineares para atenuação de vibrações em estruturas flexiveis
This work has the goal to verify the action of a mixed H2/ Hoo control formulation through output feedback for a structure modelIed in finite elements. Therefore, the pure H2 and Hoo control formulations through output feedback are also verified to validate the described equations in this work for the mixed control and show a reference to their expected resu
Publicado em: 2005
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8. Filtragem robusta : uma abordagem por desigualdades matriciais lineares
: This work deals with the problem of robust filtering for both continuous and discrete-time dynamic linear systems. More precisely, the problem of full order linear filtering for uncertain systems with Hoo norm performance criterion is analyzed. Firstly, the results from the literature based on Riccati like equations and (for norm bounded uncertainty) on co
Publicado em: 1998
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9. Mechanism of autophosphorylation of Escherichia coli nitrogen regulator II (NRII or NtrB): trans-phosphorylation between subunits.
Nitrogen regulator II (NRII or NtrB) is a homodimeric signal-transducing protein kinase/phosphatase responsible for the transcriptional regulation of the Ntr regulon in Escherichia coli. NRII is a member of a large family of proteins that are part of the related two-component signal transduction systems. We studied the mechanism of NRII autophosphorylation b
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10. Chemical communication among bacteria
Cell–cell communication in bacteria is accomplished through the exchange of chemical signal molecules called autoinducers. This process, called quorum sensing, allows bacteria to monitor their environment for the presence of other bacteria and to respond to fluctuations in the number and/or species present by altering particular behaviors. Most quorum-sens
National Academy of Sciences.
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11. Simple and Rapid Identification of the Mycobacterium tuberculosis Complex by Immunochromatographic Assay Using Anti-MPB64 Monoclonal Antibodies
A newly developed immunochromatographic assay (MPB64-ICA) for identification of the Mycobacterium tuberculosis complex was evaluated with 20 reference strains of mycobacterial species and 111 clinical isolates. MPB64-ICA displayed a very strong reaction band with organisms belonging to the M. tuberculosis complex but not with mycobacteria other than M. tuber
American Society for Microbiology.
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12. Interspecies communication in Streptococcus gordonii–Veillonella atypica biofilms: Signaling in flow conditions requires juxtaposition
During the development of human oral biofilm communities, the spatial arrangement of the bacteria is thought to be driven by metabolic interactions between them. Streptococcus gordonii and Veillonella atypica, two early colonizing members of the dental plaque biofilm, have been postulated to participate in metabolic communication; S. gordonii ferments carboh
National Academy of Sciences.