Title :
Digital compensation for MASH sigma delta modulators using H-infinity approach
Author :
Chou, Yung-Shan ; Lin, Chun-Chen
Author_Institution :
Dept. of Electr. Eng., Tamkang Univ., Taipei
Abstract :
This paper presents a new digital compensation scheme for MASH (cascaded) sigma-delta modulators (SigmaDeltaMs) with 1-bit quantizer. The compensation scheme is designed based on the well-known internal model principle and H-infinity control theory. For numerical illustration, we concentrate on a MASH 2-1 SigmaDeltaM architecture for low and middle frequencies applications. Comparisons between the proposed SigmaDeltaM and the conventional one are made, which reveal that the proposed SigmaDeltaM outperforms the conventional one in several aspects - signal-to-noise ratio (SNR), dynamic range (DR), output swing.
Keywords :
Hinfin control; analogue-digital conversion; cascade systems; modulators; quantisation (signal); sigma-delta modulation; H-infinity control theory; MASH sigma delta modulators; SNR; cascaded SigmaDeltaM; digital compensation scheme; dynamic range; output swing; quantizer; signal-to-noise ratio; Degradation; Delta modulation; Delta-sigma modulation; Digital filters; Digital modulation; H infinity control; Multi-stage noise shaping; Robust control; Signal to noise ratio; Transfer functions; H-infinity; cascaded sigma-delta modulator; digital filter; dynamic range; signal-to-noise ratio;
Conference_Titel :
Systems, Man and Cybernetics, 2008. SMC 2008. IEEE International Conference on
Conference_Location :
Singapore
Print_ISBN :
978-1-4244-2383-5
Electronic_ISBN :
1062-922X
DOI :
10.1109/ICSMC.2008.4811786
