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Automotive Class D Digital Amplifier Output Stage
Automotive applications using Class D Digital PWM Switching amplifiers have long been limited by the approach’s perceived higher cost, the potential for radiated electromagnetic interference affecting in-vehicle electronics and the difficulties of designing this type of amplifier using discrete components. An IC built on a high performance Analog Mixed Signal plus Power silicon process coupled with innovative circuit design allows the deployment of high power Class D amplifiers in vehicles that previously been confined to only Class AB amplifier designs. Class D PWM amplifiers, switching to 400 kHz or more, can achieve an unweighted dynamic range in exceeding 100 dB, linearity in excess of 80 dB, and PSRR greater than 50 dB with a full scale audio signal.
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