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calculating feedback coefficients of ADC (Read 809 times)

singh Community Member Offline Posts: 57	calculating feedback coefficients of ADC Dec 29^th, 2011, 6:59am can someone help with the calculation of coefficients a1,a2,b1,b2 of 2nd order sigma delta ADC attached in the picture? resolution required = 14 bit filter = 2 integrators n = 537 cycles please gimme any reference if possible. thanks
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Dan Clement Community Member Offline Posts: 95 Salt Lake City, Utah, USA	Re: calculating feedback coefficients of ADC Reply #1 - Dec 29^th, 2011, 9:13am Can't you just use the sigma delta toolbox in Matlab?
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raja.cedt Senior Fellow Offline Posts: 1516 Germany	Re: calculating feedback coefficients of ADC Reply #2 - Dec 29^th, 2011, 10:07am do you have NTF,STF with you? please post them so that it is very easy to estimate ... Thanks, Raj.
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ywguo

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Shanghai, PRC

Re: calculating feedback coefficients of ADC
Reply #3 - Dec 30^th, 2011, 7:38am

Hi Singh,

Do u know Undersanding Delta-Sigma Data Convertors by Richard Schreier and Gabor C. Teems?
Please click the link http://www.designers-guide.org/Books/#Schreier-2004.
A matlab toolbox named delsig is appendix in that book. The source code can be downloaded from mathworks. It has some functions that synthesize and evaluate the performance. It is a good start to decide the coefficients.

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