Compensation of finite gain-bandwidth induced errors in continuous-time sigma-delta modulators

Author

Ortmanns, Maurits ; Gerfers, Friedel ; Manoli, Yiannos

Author_Institution

SCI-Worx GmbH, Hannover, Germany

Volume

51

Issue

6

fYear

2004

fDate

6/1/2004 12:00:00 AM

Firstpage

1088

Lastpage

1099

Abstract

This paper introduces a possible compensation for finite gain-bandwidth (GBW) induced errors in continuous-time sigma-delta modulators. Therefore, a novel model is derived which reduces the effect of a finite GBW to a corresponding integrator gain-error and feedback loop delays. Thus, previously published methods for the compensation of these errors can be adopted with some modification. The results are confirmed analytically and by simulations and show a possible GBW reduction of about one order of magnitude compared to current designs.

Keywords

circuit feedback; continuous time systems; error compensation; modulators; sigma-delta modulation; A/D conversion; GBW induced errors; analog-digital conversion; error compensation; feedback loop delays; finite gain-bandwidth; integrator gain-error; sigma-delta modulators; Analytical models; Bandwidth; Delay effects; Feedback loop; Filters; Frequency; Helium; Operational amplifiers; Sampling methods; Semiconductor device noise; A/D; Analog–digital; GBW; compensation; continuous time; conversion; gain bandwidth; sigma–delta;

fLanguage

English

Journal_Title

Circuits and Systems I: Regular Papers, IEEE Transactions on

Publisher

ieee

ISSN

1549-8328

Type

jour

DOI

10.1109/TCSI.2004.829234

Filename

1304965