Difference Between Voltage and Power Amplifiers
A voltage amplifier is designed to have maximum voltage
amplification. However, there is no importance of power amplification. On the
other hand power amplifier is designed to achieve maximum power output.
S.NO
|
Particular
|
Voltage Amplifier
|
Power Amplifier
|
1.
|
β
|
High > 100
|
Low (20 to 50)
|
2.
|
RC
|
High (4-10) KΩ
|
Low (5-20Ω)
|
3.
|
Coupling
|
Usually R-C coupling
|
Transformer coupling
|
4.
|
Input voltage
|
Low of few mV
|
High (2-4V)
|
5.
|
Collector current
|
Low (=1mA)
|
High(>100mA)
|
6.
|
Power output
|
Low
|
High
|
7.
|
Output impedance
|
High (=12kΩ)
|
Low (200Ω)
|
8.
|
Power dissipation rating of active
device
|
Need to be large
|
Should have large rating
|
9.
|
Necessity of cooling arrangements
|
Not necessary
|
Cooling arrangements and heat sinks
are needed
|
10.
|
Applications
|
As a pre-amplifier
|
In output stage
|
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