April 2025
Intermediate to advanced
598 pages
16h 46m
Portuguese (Portugal, Brazil)
Content preview from Eletrónica Integrada Aplicada
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Capítulo 6. Interferências electromagnéticas e descargas electrostáticas
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Electromagnética A interferência electromagnética (EMI) trata do acoplamento indesejado de sinais e de outros efeitos secundários dentro ou entre sistemas electrónicos. Os termos compatibilidade electromagnética (EMC) e integridade do sinal são frequentemente utilizados como termos generalizados para abranger a maioria destes tópicos. A EMI e a interferência de radiofrequência (RFI) são frequentemente utilizadas de forma intercambiável e, neste caso, são consideradas a mesma coisa. Historicamente, a RFI tem sido usada desde o início da era dos rádios analógicos. Neste livro, os termos EMI, RFI, diafonia e ruído são usados de forma intercambiável.
A descarga eletrostática (ESD) está incluída neste capítulo como um tópico especial sob a égide dos sinais "não desejados". Muitos circuitos aqui discutidos afectam tanto o desempenho EMI como ESD.
Qualquer sistema eletrónico digital cria EMI, sendo a magnitude do ruído determinada pelas taxas de relógio, número de portas e presença de quaisquer outros dispositivos de comutação ativa. Os designers devem reconhecer que o ambiente está inundado de ruído eletrónico devido à eletrónica ativa, dispositivos de rádio, ruído solar, sistemas de energia da rede e inúmeros outros. Os projectistas têm de limitar a magnitude da EMI criada pelos seus produtos ...
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