A novel fully digital Class D amplifier is presented in which the output stage error is digitized by a 10-bit ADC and fed back into the modulation path to suppress distortion. This technique attenuates the in-band noise introduced by the output stage, and can tolerate large latency. A fully digital Pulse Density Modulation (PDM) Class D amplifier with output stage noise shaping is implemented on a PCB prototype. Feedback loop functionality is verified experimentally, and a 10 dB improvement in Total Harmonic Distortion plus Noise (THD+N) is realized.

Authors: McKenzie, Robert; Li, Xinchang; Snelgrove, Martin; Ng, Wai Tung
Affiliations: University of Toronto, Toronto, ON, Canada; Graduate University of the Chinese Academy of Sciences, Beijing, China; Kapik Integration, Toronto, ON, Canada(See document for exact affiliation information.)
AES Convention: 143 (October 2017) Paper Number: 9859
Publication Date: October 8, 2017
Subject: Transducers—Part 2

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