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Design of Digital Audio Amplifier for Automotive Applications

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Switching Power amplifiers are becoming quite common in audio applications, thanks to semiconductor technology advances, because of their intrinsic optimal efficiency. However usually they are used for low/medium quality application and low frequency loudspeaker systems. In this paper the design of a large bandwidth switching audio amplifier is presented. The amplifier is specifically aimed at automotive applications, where supply voltage, power consumption, and size are peculiar constraints. A prototype featuring reduced distortion, suitable for large bandwidth loudspeakers was realized and successfully tested.

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