Chapter 10
Class-G Power Amplifiers
Audio Power Amplifi er Design Handbook by Douglas Self
Most types of audio power amplifier are less efficient than Class-B; for example, Class-AB is markedly less effi cient at the low end of its power capability, while it is clear that Class-A wastes virtually all the energy put into it. Building amplifiers with higher effi ciency is more diffi cult. Class-D, using ultrasonic pulse width modulation, promises high effi ciency and indeed delivers it, but it is undeniably a diffi cult technology, and its linearity is still a long way short of Class-B. The practical effi ciency of Class-D rests on details of circuit design and device characteristics. The apparently unavoidable LC output filter — second order ...
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