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.
1. According to the usage of Frequency
Signals: