14
Power Amplifiers
14.1 Introduction
The purpose of voltage amplifier is only to provide voltage boost (gain) and not boost the current simultaneously. The voltage or current amplifiers are designed to produce small output voltage or current swing to avoid distortions. The linear incremental model of the transistor is based on this assumption in order to describe it completely. The power output is not a criterion in designing either current or voltage amplifier. In order to have sufficient amount of output power, both voltage and current swings should be quite large. The output stage of almost all electronic systems such as radio, TV, tape recorder, PA systems, etc. have a power stage. The output stage, thus, must deliver a specified amount ...
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