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calculating feedback coefficients of ADC (Read 812 times)
singh
Community Member
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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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sigmadelta.png
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Dan Clement
Community Member
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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
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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
Community Fellow
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Posts: 943
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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