Abstract
High-order delta-sigma ADCs can achieve wide dynamic ranges at a relatively low oversampling ratio. As high-order modulators may cause instability, a new delta-sigma modulator structure employing hybrid integrators and adaptive calibration is proposed. Hybrid integrators do not suffer from saturation, and they can be applied for high-order modulators without stability problems. The proposed structure uses adaptive calibration to mitigate the performance degradation caused by mismatches between analog and digital paths of hybrid integrators. Behavioral simulations of a fourth-order delta-sigma modulator show that the proposed structure can achieve a significant improvement in dynamic range.
| Original language | English |
|---|---|
| Pages (from-to) | I1025-I1028 |
| Journal | Proceedings - IEEE International Symposium on Circuits and Systems |
| Volume | 1 |
| State | Published - 2003 |
| Event | Proceedings of the 2003 IEEE International Symposium on Circuits and Systems - Bangkok, Thailand Duration: 25 May 2003 → 28 May 2003 |