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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
Copyright 2004 by Oxford University Press, Inc.Microelectronic Circuits - Fifth Edition Sedra/Smith 3
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.
Copyright 2004 by Oxford University Press, Inc.Microelectronic Circuits - Fifth Edition Sedra/Smith 9
Tensão Reversa aplicada na junção pn (Breakdown).
Copyright 2004 by Oxford University Press, Inc.Microelectronic Circuits - Fifth Edition Sedra/Smith 10
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.
Copyright 2004 by Oxford University Press, Inc.Microelectronic Circuits - Fifth Edition Sedra/Smith 11
Copyright 2004 by Oxford University Press, Inc.Microelectronic Circuits - Fifth Edition Sedra/Smith 12
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
Copyright 2004 by Oxford University Press, Inc.Microelectronic Circuits - Fifth Edition Sedra/Smith 19
(a) 2mA, 0V; (b) 0mA, 5V; (c) 0mA, 5V; (d) 2mA, 0V; (e) 3mA, 3V; (f) 4mA, 1V.
Copyright 2004 by Oxford University Press, Inc.Microelectronic Circuits - Fifth Edition Sedra/Smith 20
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
Copyright 2004 by Oxford University Press, Inc.Microelectronic Circuits - Fifth Edition Sedra/Smith 29
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Copyright 2004 by Oxford University Press, Inc.Microelectronic Circuits - Fifth Edition Sedra/Smith 31
Operação na região de ruptura reversa – Os Diodos Zener
Copyright 2004 by Oxford University Press, Inc.Microelectronic Circuits - Fifth Edition Sedra/Smith 32
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
Copyright 2004 by Oxford University Press, Inc.Microelectronic Circuits - Fifth Edition Sedra/Smith 36
Retificador de Onda Completa – Center Tap
S
dc
VV
2
DSdc
VVV
22
SVmáximaTPI 2
Copyright 2004 by Oxford University Press, Inc.Microelectronic Circuits - Fifth Edition Sedra/Smith 37
Retificador de Onda Completa – em Ponte
DSdc
VVV
22
SVmáximaTPI
S
dc
VV
2
Copyright 2004 by Oxford University Press, Inc.Microelectronic Circuits - Fifth Edition Sedra/Smith 38
Retificador com Capacitor de Filtro – Retificador de Pico
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fCR
VV p
ppripple
Retificador de Pico de Meia Onda
Copyright 2004 by Oxford University Press, Inc.Microelectronic Circuits - Fifth Edition Sedra/Smith 40
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
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.
Copyright 2004 by Oxford University Press, Inc.
Copyright 2004 by Oxford University Press, Inc.Microelectronic Circuits - Fifth Edition Sedra/Smith 62
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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Copyright 2004 by Oxford University Press, Inc.Microelectronic Circuits - Fifth Edition Sedra/Smith 69
Circuito Grampeador com carga R
Copyright 2004 by Oxford University Press, Inc.Microelectronic Circuits - Fifth Edition Sedra/Smith 70
Circuito Dobrador de Tensão
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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
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
Copyright 2004 by Oxford University Press, Inc.
DIODO ZENER
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