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THE AUTOBIAS AMPLIFIER: A New Topology for Automatically Biased Audio Amplifiers Using Power MOSFETs

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An obstacle blocking wide acceptance of power MOSFETS in audio amplifiers is the lack of an automatic bias technique. A unique circuit topology senses and maintains quiescent current despite the half-wave pulses inherent in class AB operation. Performance of the circuit, consisting of little more than a differential amplifier driving a totem pole output, rivals that of more complex circuits.

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