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Improved Analogue Class-D Amplifier with Carrier Symmetry Modulation

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A novel analogue class-D amplifier has been developed which produces low distortion. The structure follows the well known prior-art class-D structures with negative feedback, but includes modulation of the symmetry of the carrier oscillator waveform by a derivative of the input signal. This compensates a nonlinear phase modulation effect that is intrinsic to the prior-art structures. The improvement is substantial at very low extra cost.

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AES - Audio Engineering Society