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Class-G power amplifiers

Most types of audio power amplifier are less efficient than Class-B; for example, Class-AB is markedly less efficient 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 efficiency is more difficult. Class-D, using ultrasonic pulse-width modulation, promises high efficiency and sometimes even delivers it, but it is undeniably a difficult technology. The practical efficiency of Class-D rests on details of circuit design and device characteristics. The apparently unavoidable LC output filter – second order at least – can only give a flat response into one load impedance, and its magnetics are neither cheap nor easy to design. ...

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