BJT and MOSFET characteristics and Op-Amps Notes | EduRev

: BJT and MOSFET characteristics and Op-Amps Notes | EduRev

 Page 1


1
BJT and MOSFET characteristics  
and  Op-Amps
Prof K.N.Bhat,
ECE Department , IISc Bangalore
email:   knbhat@gmail.com
Micro and Smart Systems
Lecture -32
Page 2


1
BJT and MOSFET characteristics  
and  Op-Amps
Prof K.N.Bhat,
ECE Department , IISc Bangalore
email:   knbhat@gmail.com
Micro and Smart Systems
Lecture -32
2
Topics for Discussion 
• BJTs , MOSFETs and CMOS 
•Amplifiers and Op Amp Concepts
• Basic Op-Amp circuits 
Page 3


1
BJT and MOSFET characteristics  
and  Op-Amps
Prof K.N.Bhat,
ECE Department , IISc Bangalore
email:   knbhat@gmail.com
Micro and Smart Systems
Lecture -32
2
Topics for Discussion 
• BJTs , MOSFETs and CMOS 
•Amplifiers and Op Amp Concepts
• Basic Op-Amp circuits 
3
Bipolar Junction Transistor (BJT)
R
V
I I ?
0
P
?
N
Hole collection, I
0
E
V
I
P
?
N
Hole injection
E
T
V
I Iexp( )
V
?
0
Forward Biased Junction
Reverse Biased Junction
Hole injection
E
EE
T
V
I Iexp( )
V
?
0 Hole collection, 
Cp E
I I ? ?
CCp C E C
I II I I ?? ?? ?
00
E
V
E
I
P
?
N
R
V
P
?
C
I
PNP Transistor
Page 4


1
BJT and MOSFET characteristics  
and  Op-Amps
Prof K.N.Bhat,
ECE Department , IISc Bangalore
email:   knbhat@gmail.com
Micro and Smart Systems
Lecture -32
2
Topics for Discussion 
• BJTs , MOSFETs and CMOS 
•Amplifiers and Op Amp Concepts
• Basic Op-Amp circuits 
3
Bipolar Junction Transistor (BJT)
R
V
I I ?
0
P
?
N
Hole collection, I
0
E
V
I
P
?
N
Hole injection
E
T
V
I Iexp( )
V
?
0
Forward Biased Junction
Reverse Biased Junction
Hole injection
E
EE
T
V
I Iexp( )
V
?
0 Hole collection, 
Cp E
I I ? ?
CCp C E C
I II I I ?? ?? ?
00
E
V
E
I
P
?
N
R
V
P
?
C
I
PNP Transistor
4
P
+
NP
E
I
C
I
B
I
PNP Transistor
pE
I
pC
I
C
I
0
EB
V
CB
V
CpC co E co
II I I I ?? ?? ?
()
?
?
?
?
? 1
CB C
II ( )I ?? ?
0
1 ? ?
E
B
C
E
B
C
CC
BE C C C C
II
II I I I I
? ?
?? ? ? ? ?
0
0
11 ?
? ??
Page 5


1
BJT and MOSFET characteristics  
and  Op-Amps
Prof K.N.Bhat,
ECE Department , IISc Bangalore
email:   knbhat@gmail.com
Micro and Smart Systems
Lecture -32
2
Topics for Discussion 
• BJTs , MOSFETs and CMOS 
•Amplifiers and Op Amp Concepts
• Basic Op-Amp circuits 
3
Bipolar Junction Transistor (BJT)
R
V
I I ?
0
P
?
N
Hole collection, I
0
E
V
I
P
?
N
Hole injection
E
T
V
I Iexp( )
V
?
0
Forward Biased Junction
Reverse Biased Junction
Hole injection
E
EE
T
V
I Iexp( )
V
?
0 Hole collection, 
Cp E
I I ? ?
CCp C E C
I II I I ?? ?? ?
00
E
V
E
I
P
?
N
R
V
P
?
C
I
PNP Transistor
4
P
+
NP
E
I
C
I
B
I
PNP Transistor
pE
I
pC
I
C
I
0
EB
V
CB
V
CpC co E co
II I I I ?? ?? ?
()
?
?
?
?
? 1
CB C
II ( )I ?? ?
0
1 ? ?
E
B
C
E
B
C
CC
BE C C C C
II
II I I I I
? ?
?? ? ? ? ?
0
0
11 ?
? ??
5
N
+
PN
E
I
C
I
B
I
CnC co E co
I II I I ?? ?? ?
nC
I
nE
I
C
I
0
CB C
II ( )I ? ? ?? ? ?
0
1
()
?
?
?
?
? 1
NPN  Transistor
BE
V CB
V
E
B
C
C
B
E
Note that the voltage polarities and the  current flow 
directions in NPN transistors are exactly opposite to 
that of PNP transistors
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