The authors have developed a digital amplifier for car use. The major problems of conventional digital amplifiers are a lack of ability to reject the ripples and noise from car power lines, and EMI (electro-magnetic interference). However, car power lines inevitably contain voltage ripples and noise caused by the operation of the generator and various motors, switching lamps on and off, an so on. The authors have developed a novel feedback system for digital amplifiers which mainly solves the supply voltage ripple problem. By using a prototype with a feedback system, they have confirmed that the supply voltage ripple rejection is sufficient for car audio systems. The authors also confirmed that the feedback system contributes to reducing the EMI by relaxing the requirements of the switching stage operation, while keeping the audio output distortion low.
Development of a digital amplifier for car use
2003
10 Seiten, 16 Bilder, 4 Tabellen, 3 Quellen
Conference paper
English
Advanced Digital Audio Amplifier
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