Linearization of class D output stages for high-performance audio power amplifiers

A system is described which uses a quantized feedback technique to reduce the distortion generated by a class D PWM amplifier, thus making it more suitable for use in a high-performance audio system. The technique is applicable to digital PWM and applies local error correction in a noise shaping loop to reduce output-stage distortion and thus achieve a performance closer to that defined by the digitally defined PWM code.<
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