Data Weighted Averaging for Simulink

A group of Delta-Sigma SIMULINK- models with DWA mismatch shaping.

Description

The SIMULINK- models of multibit Delta-Sigma ADC and Delta-Sigma DAC all have a non-ideal D/A-converter.
 
The DAC mismatch noise will be shaped according to a general Data Weighted Averaging (DWA) transfer function 1±z^(-D), where D is a positive integer.

The DWA element selection logic calculates a selection vector. The selection vector chooses, which of the unit DACs will be used according to DAC input.

The DWA block is constructed using mainly fixed-point blocks.
Models for Incremental DWA (IDWA) were also added.

This package also includes a spurious tone estimator: the spurs can be estimated using the DS input signal and the DNL error shape.

Acknowledgements

Delta Sigma Toolbox and Modulo Time Plot inspired this file.

• Required Products: Simulink
• MATLAB release: MATLAB 7.10 (R2010a)
• Other requirements: The simulink models are saved as R14 compatible.

[Marko Neitola]

This model and the related paper (mentioned previously) were also a part of my Ph.D. thesis:

http://herkules.oulu.fi/isbn9789514297496/isbn9789514297496.pdf

[Marko Neitola]

The mismatch noise estimator was improved ad added to submission #29522: "Delta Sigma converter spurious tone predictor".

Both DWA mismatch noise model and DSM quantization noise models can be found in #29522.

[Marko Neitola]

More information about this model:

Neitola, M., Rahkonen, T.: A Generalized Data-Weighted Averaging Algorithm. Circuits and Systems II: Express Briefs, IEEE Transactions on, Volume: 57 , Issue: 2, Publication Year: 2010 , Page(s): 115 - 119

Available on IEEE Xplore