CONVERSOR ANALÓGICO-DIGITAL INTEGRADOR A CAPACITOR CHAVEADO COM FAIXA DE ENTRADA PROGRAMÁVEL

• Ano de defesa: 2010
• Autor(a) principal: Nunes, Rafael Oliveira
• Orientador(a): CATUNDA, Sebastian Yuri Cavalcanti
• Banca de defesa: Ribeiro, Luiz Antonio de Sousa
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Maranhão
• Programa de Pós-Graduação: PROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA DE ELETRICIDADE/CCET
• Departamento: Engenharia
• País: BR
• Palavras-chave em Português: Circuitos programáveis; sistema de medição; conversor analógico-digital; capacitor chaveado
• Palavras-chave em Inglês: programmable circuits; measurement system; analog-to-digital converter; switched capacitors
• Área do conhecimento CNPq: CNPQ::ENGENHARIAS::ENGENHARIA ELETRICA::ELETRONICA INDUSTRIAL, SISTEMAS E CONTROLES ELETRONICOS::AUTOMACAO ELETRONICA DE PROCESSOS ELETRICOS E INDUSTRIAIS
• Link de acesso: http://tedebc.ufma.br:8080/jspui/handle/tede/456

Programmable integrated circuits for specified applications enable its adjustment after fabrication, to fit more than one application within a certain set of applications. These circuits are flexible, but could lose in performance when compared to other circuit constructed to serve only a specific application. A programmable system can be applied to measurements involving a set of sensors with different characteristics of signals and an analog-to-digital converter. The signal range for each sensor should be adjusted as close to the input range of analog-digital converter as possible, to ensure the measurement with the full range of the signal. A solution for ensure the adjustable ranges is the employ a measurement system with programmable conditioning circuit. In this work, an analog-to-digital converter with adjustable input range is proposed, providing, equivalently, an adjustable gain value to the analog input signal. The gain values compose a minimum set to ensure no loss of measurement range of the signal, with loss of resolution within an acceptable limit. The proposed converter is a discrete integrator type with switched capacitor circuits. Behavioral and SPICE simulations were performed to validate the proposed converter.