Title :
Overloading in multistage sigma-delta modulators
Author :
Chow, Melvin K H ; Chan, P.K. ; Siek, L.
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore
fDate :
6/21/1905 12:00:00 AM
Abstract :
This paper presents a straightforward way to optimize scaling coefficients used in multistage (MASH) sigma-delta modulators. The scaling coefficients used to counter the effects of overloading are shown to be related to the reference voltage of the 1-bit D/A converter. Finally, an optimized 2-1-1 modulator with an extended dynamic range is proposed. This modulator uses a local feedback loop to extend the dynamic range (DR) to full-scale input level without overloading
Keywords :
circuit feedback; modulators; sigma-delta modulation; D/A converter; DAC reference voltage; MASH architecture; extended dynamic range; full-scale input level; local feedback loop; multistage sigma-delta modulators; optimized 2-1-1 modulator; overloading; scaling coefficients optimisation; Counting circuits; Delta modulation; Delta-sigma modulation; Digital modulation; Dynamic range; Dynamic voltage scaling; Low voltage; Multi-stage noise shaping; Noise cancellation; Quantization;
Conference_Titel :
ASICs, 1999. AP-ASIC '99. The First IEEE Asia Pacific Conference on
Conference_Location :
Seoul
Print_ISBN :
0-7803-5705-1
DOI :
10.1109/APASIC.1999.824074
