Conference paper
Multi-Bit Sigma-Delta Modulators with Enhanced Dynamic Range using Non-Linear DAC for Hearing Aids
This paper presents the possibility of employing non-linear 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-to-noise-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.
| Language: | English |
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| Publisher: | IEEE |
| Year: | 2008 |
| Pages: | 1107-1110 |
| Proceedings: | 2008 IEEE 15th International Conference on Electronics, Circuits and Systems |
| ISBN: | 1424421810 , 9781424421817 , 1424421829 and 9781424421824 |
| Types: | Conference paper |
| DOI: | 10.1109/ICECS.2008.4675051 |
| ORCIDs: | Bruun, Erik |
Auditory system Delta-sigma modulation Digital modulation Dynamic range Feedback Hearing aids Linearity Noise shaping Signal to noise ratio Voltage digital-analogue conversion feedback feedback paths hearing aids medium signal-to-noise-plus-distortion-ratio multi-bit sigma-delta modulators nonlinear low-resolution DAC sigma-delta modulation
