We have developed a digital amplifier for car use. The major problems of conventional digital amplifiers are lack of the ability to reject the ripple and noise on the car power line, and the EMI (electro-magnetic interference). We have developed a novel feedback system for digital amplifiers to solve mainly the supply voltage ripple problem. By using a prototype with a feedback system, we have confirmed that it gives enough supply voltage ripple rejection for car audio systems. We also confirmed that the feedback system could contribute to reduce the EMI by relaxing the requirements to the switching stage operation, while keeping low distortion of an audio output.
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