Nonlinearities in SC delta-sigma A/D converters

Author

Steensgaard, Jesper

Author_Institution

Tech. Univ., Lyngby, Denmark

Volume

1

fYear

1998

fDate

1998

Firstpage

355

Abstract

The effects of using nonlinear low-gain opamps in switched-capacitor delta-sigma modulators are analyzed. Using unconventional topologies, the state variables are made essentially uncorrelated with the input signal, hence opamp nonlinearity will cause very little harmonic distortion. Nonlinearity errors, which are uncorrelated with the input, are called non-harmonic distortion. Using a correlated-double-sampling integrator, the non-harmonic distortion can be reduced to a level where other errors dominate

Keywords

analogue-digital conversion; delta-sigma modulation; errors; harmonic distortion; integrating circuits; operational amplifiers; signal sampling; switched capacitor networks; A/D converters; SC delta-sigma ADC; SC delta-sigma modulators; correlated-double-sampling integrator; harmonic distortion; nonharmonic distortion; nonlinear low-gain opamps; nonlinearity errors; opamp nonlinearity; state variables; switched-capacitor type; Circuits; Delta modulation; Feedback loop; Gabor filters; Harmonic distortion; Linearity; Performance gain; Signal design; Signal to noise ratio; Topology;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronics, Circuits and Systems, 1998 IEEE International Conference on

Conference_Location

Lisboa

Print_ISBN

0-7803-5008-1

Type

conf

DOI

10.1109/ICECS.1998.813339

Filename

813339