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Title: Multi-bit sigma-delta modulators with enhanced dynamic-range using non-linear DAC for hearing aids
Authors: Goes, J.
Paulino, N.
Custódio, J. R.
Issue Date: Aug-2008
Publisher: IEEE
Abstract: This paper presents the possibility of employing nonlinear low-resolution DACs in the feedback paths of multi-bit second-order Sigma-Delta modulators. The proposed technique is particularly attractive in applications such as hearing aids, requiring a very large dynamic range and medium signal-tonoise-plus-distortion-ratio. As demonstrated through simulated results in which noise and mismatch effects are included, for the same over-sampling ratio, improvements in the order of 6-to-9 dB in the dynamic range can be achieved when comparing with the same topology employing linear-DACs.
Description: 15th IEEE International Conference on Electronics, Circuits and Systems, Malta
Appears in Collections:FCT: DEE - Documentos de conferências internacionais

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