This paper describes a bridge amplifier with balanced differential inputs, balanced outputs and a floating power supply for the final stages. Like a transformer, signal amplification without respect to ground is realized, but with a much wider frequency range and lower THD. The amplifier is comprised of a single amplifier with two feedback loops, whose function is described. Two output stages are simultaneously driven in push-pull thanks to the symmetrical and complementary differential circuit.
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https://aes2.org/publications/elibrary-page/?id=11838
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