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AIPMT 2013 Physics and Chemistry Paper
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© examsnet.com
Question : 2
Total: 90
In a common emitter (CE) amplifier having a voltage gain
G
, the transistor used has transconductance
0.03
mho
and current gain 25. If the above transistor is replaced with another one with transconductance
0.02
mho and current gain 20 , the voltage gain will be :
5
4
G
2
3
G
1.5
G
1
3
G
Validate
Solution:
Voltage gain
A
V
=
∆
V
C
∆
V
B
=
R
L
∆
I
C
∆
V
B
=
g
m
R
L
A
V
1
A
V
2
=
g
m
1
g
m
2
⇒
G
A
V
2
=
0.03
0.02
⇒
A
V
2
=
2
3
G
© examsnet.com
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