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Fully Balanced Bridge Amplifier

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A bridge amplifier with balanced differential inputs, balanced outputs, and a floating power supply for the final stages is described. Like a transformer, its output stage operates independent of ground, but with a much wider frequency range and lower total harmonic distortion. The amplifier is composed of a single amplifier with two feedback loops. Two output stages are driven simultaneously in a push-pull manner by means of a symmetrical and complementary differential circuit.

JAES Volume 32 Issue 6 pp. 415-421; June 1984
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AES - Audio Engineering Society