Conference paper
Nonlinearities in SC Delta-Sigma A/D Converters
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
| Language: | English |
|---|---|
| Publisher: | IEEE |
| Year: | 1998 |
| Pages: | 355-358 |
| Proceedings: | 1998 IEEE 5th International Conference on Electronics, Circuits and Systems |
| ISBN: | 0780350081 and 9780780350083 |
| Types: | Conference paper |
| DOI: | 10.1109/ICECS.1998.813339 |
A/D converters Circuits Delta modulation Feedback loop Gabor filters Harmonic distortion Linearity Performance gain SC delta-sigma ADC SC delta-sigma modulators Signal design Signal to noise ratio Topology analogue-digital conversion correlated-double-sampling integrator delta-sigma modulation errors harmonic distortion integrating circuits nonharmonic distortion nonlinear low-gain opamps nonlinearity errors opamp nonlinearity operational amplifiers signal sampling state variables switched capacitor networks switched-capacitor type
