TY - GEN

T1 - Multi-Bit Sigma-Delta Modulators with Enhanced Dynamic Range using Non-Linear DAC for Hearing Aids

A1 - Custòdio,José

A1 - Paulino,Nuno

A1 - Goes,João

A1 - Bruun,Erik

AU - Custòdio,José

AU - Paulino,Nuno

AU - Goes,João

AU - Bruun,Erik

PB - IEEE

PY - 2008

Y1 - 2008

N2 - 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.

AB - 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.

U2 - 10.1109/ICECS.2008.4675051

DO - 10.1109/ICECS.2008.4675051

SN - 14-24-42181-0

BT - Proceedings of the 15th IEEE International Conference on Electronics, Circuits and Systems

T2 - Proceedings of the 15th IEEE International Conference on Electronics, Circuits and Systems

SP - 1107

EP - 1110

ER -