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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 different amplifier driving a totem-pole output stage, rivals that of more complex circuits.

JAES Volume 30 Issue 4 pp. 208-216; April 1982
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AES - Audio Engineering Society