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Delta Sigma converter spurious tone predictor

version 1.5 (3.97 KB) by

A simple analytical model that predicts DSM spurious tones with arbitrary stimulus.

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This file contains functions for:
- estimating the quantizer noise from DSM and
- estimating the mismatch noise from DWA-DAC.

Both (time-domain) models generate noise estimate for arbitrary input vector (dc, sinusoid, n-tone, sawtooth etc.).

Applicable to bandpass DSMs and bandpass DWA.

For simulation, DS toobox is recommended: File ID: #19

Simulink DSM/DWA model can be found in: File ID: #23079

For further information:

Neitola M & Rahkonen T (2010) A Generalized Data-Weighted Averaging Algorithm. IEEE Trans. Circuits and Systems II: Express Briefs 57(2): 115-119.

Neitola M & Rahkonen T (2010) A Qualification Approach to DAC Mismatch-Shaping Methods. IEEE Trans. Circuits and Systems II: Express Briefs 57(11): 858-862.

Neitola M & Rahkonen T (2011) Predicting and Avoiding Spurious Tones in a DWA Mismatch Shaping DAC. Accepted to IEEE Trans. Circuits and Systems II: Express Briefs.

Neitola M & Rahkonen T (2011) Compact Tone-Behavior Model for Delta-Sigma Modulator. Submitted to European conference on circuit theory and design 2011.

Comments and Ratings (1)

Marko Neitola

Marko Neitola (view profile)

The time-domain models presented here was also discussed in my doctoral dissertation, see chapter 6 in:
http://herkules.oulu.fi/isbn9789514297496/isbn9789514297496.pdf

Updates

1.5

Added a model for multibit DSM's mismatch shaper.
Fixed a bug in the DSM noise model.

1.2

Model accuracy improved. Removed extra material.

1.1

Added a complementing model: a simulink model of a digital Delta-Sigma modulator. The quantizer for this model is "truncation": unsigned integer ouput.

MATLAB Release
MATLAB 7.10 (R2010a)
Acknowledgements

Inspired by: Delta Sigma Toolbox

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