Extending the Stable Input Range of a Single-Bit Sigma-Delta Modulator with a Saturation Element

This paper presents a simple compensation scheme for extending the stable input range of a single-bit sigma-delta (Σ-Δ) modulator that is normally stabilized in sliding mode. The proposed control scheme requires a saturation element that provides additional feedback to modify and stabilize the modulator loop filter when the modulator is going to lose stability due to large input level. The proposed compensation scheme is easy to implement and is only activated when the input level is exceedingly large, so it does not affect the performance of the modulator with its input in the normal range. A third-order sigma-delta modulator with an extended input range was designed and implemented to demonstrate the practicality of the proposed design. 

[1]  Chih-Yuan Chen,et al.  Wide dynamic-range sigma-delta modulator with adaptive feed-forward coefficients , 2010, IET Circuits Devices Syst..

[2]  Nuno Paulino,et al.  A 3 rd order 1.5-bit continuous-time (CT) Sigma-Delta (ΣΔ) modulator optimized for Class D audio power amplifier , 2010, MIXDES 2010.

[3]  Nuno Paulino,et al.  A 3rd order 1.5-bit continuous-time (CT) Sigma-Delta (ΣΔ) modulator optimized for Class D audio power amplifier , 2010, Proceedings of the 17th International Conference Mixed Design of Integrated Circuits and Systems - MIXDES 2010.

[4]  Mark Sandler,et al.  Digital Power Amplification Using Sigma-Delta Modulation and Bit Flipping , 1997 .

[5]  A. D. Fifield,et al.  Dynamic tuning of the noise transfer function of high order delta-sigma analog to digital converters , 2002, 2002 IEEE International Symposium on Circuits and Systems. Proceedings (Cat. No.02CH37353).

[6]  Yiannos Manoli,et al.  On Design a High Speed Sigma Delta DAC Modulator for a Digital Communication Transceiver on Chip , 2008, 2008 11th EUROMICRO Conference on Digital System Design Architectures, Methods and Tools.

[7]  Shiang-Hwua Yu,et al.  Use of Sliding-Mode Modulation in Switch-Mode Power Amplification , 2008, IEEE Transactions on Industrial Electronics.

[8]  Bin Zhao,et al.  Continuous-time sigma-delta modulator design for low power communication applications , 2007, 2007 7th International Conference on ASIC.

[9]  G. Temes,et al.  Single-loop ΔΣ modulator with extended dynamic range , 2008 .

[10]  V.M. Tousi,et al.  A 3.3 V/1 W class D audio power amplifier with 103 dB DR and 90% efficiency , 2002, 2002 23rd International Conference on Microelectronics. Proceedings (Cat. No.02TH8595).

[11]  Shiang-Hwua Yu Analysis and design of single-bit sigma-delta Modulators using the theory of sliding modes , 2006, IEEE Transactions on Control Systems Technology.

[12]  G. Ripamonti,et al.  A programmable A/D sigma-delta converter for pulse digital processing setups , 2004, IEEE Transactions on Nuclear Science.