A high power Class A amplifier dissipates a lot of power in spite of high fidelity. A Class D switching power amplifier has high efficiency and poor dynamics by low bandwidth. The previous paper proposes a high efficiency Class A power amplifier with the Class D switching power amplifier and floating power supplies. This paper proposes a novel high efficiency Class A amplifier accompanied to the high dynamic switching power supply and without floating power supplies. This amplifier has the merits of both Class A and Class D. The efficiency is seventy-four percent at full power rating. The distortion is about the same as that of Class A amplifiers. The -3dB bandwidth is from DC to 100 kHz.
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