DocumentCode
23581
Title
Opamp gain compensation technique for continuous-time ΣΔ modulators
Author
Gonzalez-Diaz, V.R. ; Peña-Perez, A. ; Maloberti, Franco
Author_Institution
Fac. of Electron., Benemerita Univ. Atonoma de Puebla, Puebla, Mexico
Volume
50
Issue
5
fYear
2014
fDate
Feb. 27 2014
Firstpage
355
Lastpage
356
Abstract
A new method that compensates for the low DC gain of nanometre operational amplifiers (opamps) used for high-speed continuous-time (CT) ΣΔ modulators is described. The proposed solution compensates for the integrator´s phase error which is a main limitation produced by the low opamp´s gain. The method uses a simple auxiliary gain stage and a resistor. Simulations of a second-order CT ΣΔ modulator utilising fast single-stage opamps with gain as low as 25 dB verify the effectiveness of the method.
Keywords
operational amplifiers; resistors; sigma-delta modulation; CT ΣΔ modulator; high-speed continuous-time ΣΔ modulator; nanometre operational amplifier; phase error integrator; resistor; second-order CT ΣΔ modulator; single-stage op-amp gain compensation technique;
fLanguage
English
Journal_Title
Electronics Letters
Publisher
iet
ISSN
0013-5194
Type
jour
DOI
10.1049/el.2013.3311
Filename
6759651
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