Definition of power amplifier
A transistor amplifier which raises the power level of the
signals that have audio frequency range is known as transistor power amplifier.
In general the last stage of multistage amplifier is the power stage. A power amplifier
differs from the voltage amplifier. A transistor that is suitable for power
amplification is generally called as power transistor.
Classification of Power Amplifier
The power amplifiers can be classified in the following ways.
(i)
Audio
frequency power amplifiers.
(ii)
Radio
frequency power amplifiers.
(iii)
Video
frequency power amplifiers.
2. According to the period of
Conduction:
(i)
Class
A Power Amplifiers: The period of conduction is for total 360 o
(full cycle).
(ii)
Class
B Power Amplifiers: The period of conduction is for 180o (half
cycle).
(iii)
Class
AB Power Amplifiers: The period of conduction is greater than 180o
but less than 360o (in between class A and class B).
(iv)
Class
C Power Amplifiers: The period of conduction is for less than 180o.
3. According to the Configuration used:
(i)
Single
ended amplifier.
(ii)
Push
pull amplifier.
(iii)
Complementary
symmetry push pull amplifier.
The power amplifiers are primarily divided into two categories• Audio-power amplifiers – also called the small signal power amplifiers, raise the power levels of signals that have audio-frequency range (20 Hz- 20 kHz)
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