multistage amplifier: part 1 -...
TRANSCRIPT
Multistage Amplifier: Part 1
Islamic university –Gaza
Electrical Engineering
Electronic II Lab
Fall-2011iugaza2010.blogspot.com
•Application of BJT:
(1) Amplification (linear mode)
(2) Switching ( cutoff-saturation region)
(3) Isolation
•Steps of Amplification:
(1) Biasing ( applying DC voltage )
•To activate Transistor
•To get Linear mode
(2) Applying input AC signal
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Multistage Amplifier
One Stage BJT Amplifier
With Re=100
No load State
1.8k load
With Re=47
No load State
1.8k load
Two Stage BJT Amplifier
No load state
1.8K load
Two port system
inii
thvnlio
i
ovnl
ZIV
EAVV
V
VA
*
*
inii
vnlio
ZIV
AVV
*
*
No Load State
vloadedvnlol
lo
vnlol
lidervoltagedivo
AAZR
R
Vi
V
AViZR
RV
*
*
With RL Load
Hot Tip
vnlol
lvloaded A
ZRR
A *
)m(***
***
:
odelrefromRcZo
AA
Note
vloadedvnl
Part One: One stage BJT Amplifier
No load state
Results:
[1] Calculation:
10Re
Rc
model re From
nlAΩ 6.5
4
26mVre
mA 4100
7.0091.1
Re
0Re*
091.112101
1
12
2
mA
VVIe
IeVBEVB
VVRR
RV
BEB
dcB
Results:
[2] Practical:
18.905.0
459.0
Vi
VoAvnl
( A) Using Multimeter to measure Vi & Vo
( B) Using Oscilloscope to display Vi & Vo
Results:
[3] Simulation (Orcad 9):
vnlvloaded
vnlol
lvloaded
AA
AZR
RA
then
k 1000 ~high very is Rwhen L
*
VoAvnl
Vi
With 1.8k load
Results:[1] Calculation:
Rc Zo where,,, 428.610*18.1
8.1
model) re (From 10Re
Rc
*
vnl
ol
lvloaded
nl
AZR
RA
A
Results:
[2] Practical:
9.505.0
295.0
Vi
VoAloaded
( A) Using Multimeter to measure Vi & Vo
( B) Using Oscilloscope to display Vi & Vo
Results:
[3] Simulation (Orcad 9):
loadedVo
AVi
For Re= 47No load state
Results:
[1] Calculation:
276.2147
1000
Re
Rc
model re From
nlAΩ 125.332.8
26mVre
mA 32.847
7.0091.1
Re
0Re*
091.112101
1
12
2
mA
VVIe
IeVBEVB
VVRR
RV
BEB
dcB
Results:
[2] Practical:
48.1905.0
974.0
Vi
VoAvnl
( A) Using Multimeter to measure Vi & Vo
( B) Using Oscilloscope to display Vi & Vo
Results:
[3] Simulation (Orcad 9):
vnlvloaded
vnlol
lvloaded
AA
AZR
RA
then
k 1000 ~high very is Rwhen L
*
VoAvnl
Vi
With 1.8k load
Results:[1] Calculation:
Rc Zo where,,, 677.13276.21*18.1
8.1
model) re (From 276.21Re
Rc
*
vnl
ol
lvloaded
nl
AZR
RA
A
Results:
[2] Practical:
56.1205.0
628.0
Vi
VoAloaded
( A) Using Multimeter to measure Vi & Vo
( B) Using Oscilloscope to display Vi & Vo
Results:
[3] Simulation (Orcad 9):
VoAvl
Vi
Part Two: Two stage BJT Amplifier
Cascade connection :
In which each stage is coupled with the
next by a capacitor.
kreRBRBZi 8.0~Re)(//2//12
94.56 21.276*10* 0.44
*
)2( )1(18.0
8.0 )(
vnlvnltotvnl AAA
(1) With no load
)2( )1(12
2
)2()1()(
*
*
vnlvnloin
in
vnlvloadedtotvnl
AAZZ
Z
AAA
kRZ co 11
[1] Calculation:
Results:
[2] Practical:
8005.0
4)(
Vi
VoA totnl
( A) Using Multimeter to measure Vi & Vo
( B) Using Oscilloscope to display Vi & Vo
Results:
[3] Simulation (Orcad 9):
( )vnl totVo
AVi
kreRBRBZi 8.0~Re)(//2//12
(1) With 1.8k load
60.7
276.21*18.1
8.1*10*
18.0
8.0
*
*
)2(2
)1(12
2
)2()1()(
vnl
oL
Lvnl
oin
in
vloadedvloadedtotvloaded
AZR
RA
ZZZ
AAA
kRZ co 11
[1] Calculation:
Results:
[2] Practical:
2.5105.0
56.2)(
Vi
VoA totloaded
( A) Using Multimeter to measure Vi & Vo
( B) Using Oscilloscope to display Vi & Vo
Results:
[3] Simulation (Orcad 9):
( )loaded totVo
AVi
