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A Digital Class-D Amplifier with Power Supply Correction

Digital class-D amplifiers are cost-effective solutions for a wide range of digital audio applications, because of their high power efficiency and ease of integration. This paper presents a real-time cost-effective power supply correction algorithm, which increases the power supply rejection of an open-loop digital class-D amplifier substantially. It enables open-loop digital class-D amplifiers with inexpensive power supplies with less decoupling. Measurements on a prototype amplifier with single-ended speaker loads show 57dB suppression for 100Hz supply ripple, while intermodulation products between a 100Hz ripple and a 1kHz tone are attenuated with 40dB. The dynamic range of the amplifier is 94dB, which is in agreement with phase noise measurements on the on-chip clock generator.

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