Noise Transfer Function Design and Optimization for Digital Sigma-Delta Audio DAC

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Authors

  • Marcin LEWANDOWSKI Warsaw University of Technology Institute of Radioelectronics

Abstract

The parameters of sigma-delta audio DAC depend mainly on digital sigma-delta modulator’s features, especially on its noise transfer function (NTF). Many methods of design and optimization of the loop filter’s coefficients in sigma-delta modulators have been proposed so far. These methods enable the designer to get suitable noise transfer functions for specific application. This paper reviews NTF design and optimization methods which are particularly useful in audio applications.

Keywords:

noise transfer function (NTF), NTF design, NTF optimization, sigmadelta modulation, sigma-delta audio DAC, psychoacoustic NTF optimization, NTF stability criteria

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