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Sridhar

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25 Nov 2010 Delta Sigma Toolbox High-level design and simulation of delta-sigma modulators Author: Richard Schreier

Dear Dr. Schreier I am trying to use the toolbox to simulate a Sigma Delta Converter in Simulink. I was able to do it succesfully for a CIFF structure and now I am doing it for a CIFB structure.
Although I am able to simulate the Sigma Delta with the toolbox, it is unstable in Simulink.
Moreover I find that the CIFB topology shown in the manual is different as in this report (refer to figure 4 on page 5):
http://www.terasoft.com.tw/events/conference/2006/cfp/2006CFP_selected_Papers/3/3-2.pdf

My code is:
order=4;
OSR=545;
OPT=1;
H_inf=1.2;
ntf=synthesizeNTF(order, OSR, OPT, H_inf, f0);
[a,g,b,c]=realizeNTF(ntf, 'CIFB');
ABCD = stuffABCD(a,g,b,c,'CIFB');

Then I use the calculated a,g,b,c values in simulink.

best regards and thanks

Sridhar

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