modelos mosfet jacobus w. swart. potencial de fermi e concentrações n e p -n-n p
TRANSCRIPT
![Page 1: Modelos MOSFET Jacobus W. Swart. Potencial de Fermi e concentrações n e p -n-n p](https://reader033.vdocuments.net/reader033/viewer/2022061606/552fc10d497959413d8c4491/html5/thumbnails/1.jpg)
Modelos MOSFET
Jacobus W. Swart
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Potencial de Fermi e concentrações n e p
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.enn
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- n p
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kTq
AS
FS
eNn)2(
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SOXFBGB VVV
O
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SOX C
C
QV
DFFBGBOI QVVCQ )2(
SSiAD NqQ .2
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VT – Tensão de Limiar Clássica
FASiO
FFBT NqC
VV .2....2.1
.2
FS .2
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MSO
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Diodo Controlado por Portaou MOS de 3 Terminais:
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SASiD NqQ ...2
).2.(...2.1
.2 FDASiO
FDFBTB VNqC
VVV
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Modelos I-V
)()( yyVVV SOXFBGB )(.2)( yVy FS
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DI
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SOX C
C
QyV
)(
)()](2[)( yQyVVVCyQ DFFBGBOI
)](2[.2)( yVNqyQ FSiAD
)](2[..2)](2[)( yVNqyVVVCyQ FASiFFBGBOI
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Modelo de Lei Quadrática,
Shichman e Hodges ou SPICE Nível 1
)2(.2)( SBFSiAD VNqyQ
)2(..2)](2[)( SBFASiFFBGBOI VNqyVVVCyQ
)]([)( yVVVCyQ TGBOI
)(.)( ydRIydV D
dy
dxW
ydRix
0
1
1)(
nq n .
1
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In
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)(00
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)(0
ydVQL
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InD
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)()]()[(0
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2)[(
)( TGSDSsat VVV
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Variação de V(y)
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Saturação:
2)(2 TGSOnDsat VVCL
WI
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Modelo de Carga de Corpo,
Ihantola e Moll ou SPICE nível 2. )](2[..2)](2[)( yVNqyVVVCyQ FASiFFBGBOI
)(0
ydVQL
WI
DSV
InD
2
32
3)2()2(
2
3
2)
22( SBFSBFDS
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ASiDS
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L
WI
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FBGSO
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VVC
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NqVVV
)(2
11)2(2
2
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Corrente Sub-Limiar
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)1()(
' kTqV
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2
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2
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max
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oxSi
x
t
q
kTS
ASiO
NqC
...2.1
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Efeitos Secundários Importantes:
a) Variação da Mobilidade
SBBTGS VVV
)(10
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b) Efeito de Polarização de Substrato
).2(.2 SBFFFBT VVV
ASiO
NqC
...2.1
Medir VT para várias polarizações de VSB
Importante para transistores em série!
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c) Modulação do Comprimento
Efetivo de Canal
)1()(2
2DSTGSOnDsat VVVC
L
WI
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d) Efeito de Temperatura
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e) Isolação entre MOSFETs em
Circuitos Integrados
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f) Manipulação Destrutiva de MOSFETs
BEox~ 2E7 V/cm
Portanto: t = 2 nm BV ~ 20 V
Temos também:
Q V
Necessitamos circuitos de proteção
OCA
QV
.
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Tipos de MOSFET’s
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Símbolos de MOSFET’s
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Capacitâncias p/ ac e transitórios:
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Capacitâncias Intrínsecas
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Capacitâncias Parasitárias:a) sobreposição de porta sobre fonte e dreno
WLt
CC Sox
oxGDOGSO ..
LS = LD = difusão lateralde fonte e dreno
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b) Sobreposição de porta sobre região de campo
LWt
Ccampoox
oxGBO ..
/
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c) Junções de fonte e dreno:de fundo e de perímetro
Mjsw
bi
SBjswS
M
bi
SBjSSB V
VCP
V
VCAC
j
1..1.. 00
A = área da junçãoC = cap./unid.áreaM = coef. graduaçãobi
ASij V
NqC
20