Title :
A novel signal-predicting multibit delta-sigma modulator
Author_Institution :
Dept. of Electr. & Comput. Eng., Concordia Univ., Montreal, Que., Canada
Abstract :
In this paper, the signal-predicting oversampling scheme (Lu et al. (2002)) is developed for the design of the internal quantizers of multibit delta-sigma (ΔΣ) modulators. By applying the scheme, it has been derived that, regardless of the resolution of the internal quantizer, only 4 comparators are required in a first-order multibit ΔΣ modulator provided that an appropriate oversampling ratio (OSR) is chosen. To verify the derived results, an illustrative signal-predicting first-order 4-bit ΔΣ modulator with 4 comparators is presented. Simulation results show that the modulator functions very well and when compared with a corresponding modulator with a normal flash internal quantizer, in which 16 comparators have to be used, the proposed modulator demonstrates advantages in power consumption and silicon area.
Keywords :
comparators (circuits); delta-sigma modulation; modulators; power consumption; signal sampling; ΔΣ modulator; 4 bit; comparators; first-order modulator; internal quantizers; multibit delta-sigma modulator; oversampling ratio; power consumption; signal-predicting oversampling scheme; silicon area; Bandwidth; Delta modulation; Digital modulation; Frequency; Output feedback; Quantization; Sampling methods; Signal design; Signal resolution; Voltage;
Conference_Titel :
Electronics, Circuits and Systems, 2004. ICECS 2004. Proceedings of the 2004 11th IEEE International Conference on
Print_ISBN :
0-7803-8715-5
DOI :
10.1109/ICECS.2004.1399625