System-level optimization of a DAC for hearing-aid audio class D output stage

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Abstract

This paper deals with system-level optimization of a digital-to-analog converter (DAC) for hearing-aid audio Class D output stage. We discuss the ΣD modulator system-level design parameters – the order, the oversampling ratio (OSR) and the number of bits in the quantizer. We show that combining a reduction of the OSR with an increase of the order results in considerable power savings while the audio quality is kept. For further savings in the ΣD modulator, overdesign and subsequent coarse coefficient quantization are used. A figure of merit (FOM) is introduced to confirm this optimization approach by comparing two ΣD modulator designs. The proposed optimization has impact on the whole hearing-aid audio back-end system including less hardware in the interpolation filter and half the switching rate in the digital-pulse-width-modulation (DPWM) block and Class D output stage.

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Pracný, P., Jørgensen, I. H. H., & Bruun, E. (2013). System-level optimization of a DAC for hearing-aid audio class D output stage. IFIP Advances in Information and Communication Technology, 394, 647–654. https://doi.org/10.1007/978-3-642-37291-9_70

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