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A Delta-Sigma Modulator with UPWM Quantizer for Digital Audio Class-D Amplifier

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Abstract

In this paper, a delta-sigma modulator (DSM) with uniform pulse-width modulation (UPWM) quantizer for digital audio class-D power amplifier is presented. A pole-moving approach for Inverse Chebyshev filters is proposed to stabilize the UPWM modulator as well as improve its performance. The characteristics of the saw-Tooth carrier for UPWM quantizer is explored to reduce the output switching rate and the power loss in class-D amplifier in the pulse-density modulation (PDM) case. In the presented single-loop sixth-order UPWM modulator with the ameliorated saw-Tooth carrier, an SNDR of 120 dB within 20-kHz bandwidth can be achieved under full-scale signal input. With the proposed schemes, the highest transfer efficiency of 1 for digital class-D amplifier can also be obtained.

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Kuo, C. H., & Liou, Y. J. (2019). A Delta-Sigma Modulator with UPWM Quantizer for Digital Audio Class-D Amplifier. In Proceedings of the 26th International Conference “Mixed Design of Integrated Circuits and Systems”, MIXDES 2019 (pp. 293–297). Institute of Electrical and Electronics Engineers Inc. https://doi.org/10.23919/MIXDES.2019.8787135

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