( 1 ) Gain of amplifier
G = G1 ×
G2 × G3
Where
G1 = Gain of first stage
G2 =
Gain of second stage
G3 =
Gain of third stage
( 2 ) Relation between “Bel” and “dB”
1 Bel =
10 dB
( 3 ) Gain of Amplifier in dB
G = G1 +
G2 + …… + Gn
Where
G1 =
Gain of first stage ( dB )
G2 =
Gain of second stage ( dB )
Gn
= Gain of nth stage ( dB )
( 4 ) Power gain
= 10 Log10 ( Pout / Pin
) dB
( 5 ) Voltage gain
= 20 Log10 ( Vout / Vin
) dB
( 6 ) Current gain
=
20 Log10 ( Iout / Iin ) dB
( 7 ) Bandwidth of amplifier
BW
= f2 – f1
Where
f2 = Upper cut off frequency
f1 = Lower cut off frequency
- f1 and f2 is called as 3 dB frequency or half power frequency.
( 8 ) Voltage gain of RC Coupled Amplifier
Voltage
gain = β ( Rac / Rin )
Where Rac
= Effective load of first stage
= Rc ‖ Rin
( 9 ) The load reflected at the primary side of the
transformer coupled amplifier
RL’
= ( NP / NS ) RL
Where RL
= Load resistance
NP
= Primary turns
NS = Secondary turns
OR
RL’
= ( IS / IP )2 RL
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