DC Analysis of High Order Sigma Delta Modulators

Reefman D, Janssen E. DC Analysis of High Order Sigma Delta Modulators. In: AES Convention 113. Audio Engineering Society; 2002. Paper 5693. Available from: https://aes.org/publications/elibrary-page/?id=11237

@inproceedings{Reefman2002_11237,
  author = {Reefman, Derk and Janssen, Erwin},
  title = {{DC Analysis of High Order Sigma Delta Modulators}},
  booktitle = {AES Convention 113},
  note = {Paper 5693},
  year = {2002},
  month = oct,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=11237}
}

TY  - CPAPER
TI  - DC Analysis of High Order Sigma Delta Modulators
AU  - Reefman, Derk
AU  - Janssen, Erwin
T2  - AES Convention 113
M1  - Paper 5693
PY  - 2002
DA  - 2002/10/06
UR  - https://aes.org/publications/elibrary-page/?id=11237
PB  - Audio Engineering Society
LA  - en
AB  - A new method for the DC analysis of a Sigma Delta modulator (SDM) is presented. The model used for the description of a SDM is adopted from Candy's model for a first order SDM. However, where Candy's model is exact for a first order SDM, it fails to be so in a higher order case. In our model, we deal with this by the introduction of stochastic behaviour of the SDM, and obtain the probability density distribution function of some variables which determine many of the characteristics of the SDM in the time domain. Comparison with simulation results shows that the assumption of stochastic behaviour is rather good for SDM orders greater than 3, which display significant noise shaping. For lower orders (or less aggressive noise shaping) the approximation is less good. As an aside, the new model of sigma delta modulation also clarifies why the 'time-quantized' dither approach presented by Hawksford is much better compared to standard quantizer dithering.
ER  -