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Copyright 2004 by Oxford University Press, Inc.
Diodos
11Microelectronic Circuits - Fifth Edition Sedra/Smith
Copyright 2004 by Oxford University Press, Inc.Microelectronic Circuits - Fifth Edition Sedra/Smith 2
Estrutura física simplificada do diodo de junção
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Representação 2D do cristal de Silício
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Representação 2D do cristal de Silício
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Cristal de Silício dopado por um elemento pentavalente: Semicondutor tipo n.
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Cristal de Silício dopado por um elemento trivalente: Semicondutor tipo p.
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Junção pn sem tensão aplicada.
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Tensão Reversa aplicada na junção pn.
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Tensão Reversa aplicada na junção pn (Breakdown).
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Figure 3.49 The pn junction excited by a constant-current source supplying a current I in the forward direction. The depletion layer narrows and the barrier voltage decreases by V volts, which appears as an external voltage in the forward direction.
Tensão Direta aplicada na junção pn.
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Diodo Ideal.
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Polarização (a) Direta e (b) Reversa.
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Uma aplicação simples: O Retificador
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Figure E3.2
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Vs = 24 Vp ID=???
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Outras aplicações: Portas Lógicas com Diodos
OR AND
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VB=V=0
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(a) 2mA, 0V; (b) 0mA, 5V; (c) 0mA, 5V; (d) 2mA, 0V; (e) 3mA, 3V; (f) 4mA, 1V.
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Características Elétricas dos Diodos de Junção
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Características Elétricas dos Diodos de Junção
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Dependência da característica direta do diodo com a Temperatura Queda de 2mV para o aumento de 1ºC.
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Análise de Circuitos com Diodos
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Análise Gráfica
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Modelos Simplificados de Diodos
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Modelos de segmentos lineares da característica direta do diodo e a representação do circuito equivalente.
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D
DDDD rR
VVI
0
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R
VVI DDD
D
Modelo da queda de tensão constante
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Operação na região de ruptura reversa – Os Diodos Zener
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Especificando e Modelando o Diodo Zener
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Modelo para o Diodo Zener
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Circuitos Retificadores
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Retificador de Meia Onda
S
dc
VV
0DSdc
VVV
SVmáximaTPI
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Retificador de Onda Completa – Center Tap
S
dc
VV
2
DSdc
VVV
22
SVmáximaTPI 2
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Retificador de Onda Completa – em Ponte
DSdc
VVV
22
SVmáximaTPI
S
dc
VV
2
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Retificador com Capacitor de Filtro – Retificador de Pico
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fCR
VV p
ppripple
Retificador de Pico de Meia Onda
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Retificador de Pico de Onda Completa
fCR
VV p
ppripple 2
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Circuitos Limitadores (ou Ceifadores)
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Pode ser: Série e Paralelo
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Pode ser: Série e Paralelo
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Copyright 2004 by Oxford University Press, Inc.
Copyright 2004 by Oxford University Press, Inc.
Copyright 2004 by Oxford University Press, Inc.
Copyright 2004 by Oxford University Press, Inc.
Copyright 2004 by Oxford University Press, Inc.
Copyright 2004 by Oxford University Press, Inc.
Copyright 2004 by Oxford University Press, Inc.
Copyright 2004 by Oxford University Press, Inc.
Copyright 2004 by Oxford University Press, Inc.
Copyright 2004 by Oxford University Press, Inc.
Copyright 2004 by Oxford University Press, Inc.
Copyright 2004 by Oxford University Press, Inc.
Copyright 2004 by Oxford University Press, Inc.
Copyright 2004 by Oxford University Press, Inc.
Copyright 2004 by Oxford University Press, Inc.
Copyright 2004 by Oxford University Press, Inc.
Copyright 2004 by Oxford University Press, Inc.
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Circuito Grampeador (ou Restaurador cc)
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Copyright 2004 by Oxford University Press, Inc.
Copyright 2004 by Oxford University Press, Inc.
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Circuito Grampeador com carga R
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Circuito Dobrador de Tensão
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DIODO ZENER
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DIODO ZENER
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DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
