Title :
Design of ΣΔ modulators with reduced number of operational amplifiers
Author :
Fiore, C.D. ; Maloberti, Franco
Author_Institution :
Dept. of Electron., Pavia Univ., Italy
fDate :
28 Aug.-2 Sept. 2005
Abstract :
A method that reduces the number of operational amplifier used in sigma delta modulators is described. The approach together with the double sampling method permits the designer to obtain very low figure of merits (and low power) as required by portable wireless applications. The proposed technique is applied to second and third order architectures. The limits due to capacitor mismatches make the approach useful for medium resolution and low over-sampling ratios. A case study meeting typical WCDMA specification is given.
Keywords :
integrated circuit design; operational amplifiers; sampling methods; sigma-delta modulation; ΣΔ modulator; WCDMA specification; capacitor mismatch; double sampling method; operational amplifier; over-sampling ratio; second order architecture; sigma delta modulator; third order architecture; Capacitors; Circuits; Delta modulation; Delta-sigma modulation; Design methodology; Energy consumption; Operational amplifiers; Output feedback; Sampling methods; Transfer functions;
Conference_Titel :
Circuit Theory and Design, 2005. Proceedings of the 2005 European Conference on
Print_ISBN :
0-7803-9066-0
DOI :
10.1109/ECCTD.2005.1522946
