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It has been a while since I dealth with sigma delta converters. However, I believe, that a typical way to measure SNR (at least in MATLAB simulation,and in IEEE papers) is to use a single-tone sine wave with amplitude equivalent to half of full-scale dynamic range of s/d converter and with frequency equivalent to half passband width. Then measure the peak single tone in the spectrum of output and compare it to the level of the noise in your pass-band.
Thank you, first. I have already studied some IEEE papers and roughly known of SNR. But I don't know whether I should design DSM module using Matlab and simulate it using simulink. If I should do it, I can't get the data from the result of simulink and so I can't caculate SNR. Can you tell me whether my way is wrong?
Just work through the matlab code and you'll see how to calculate the SNR.
Also, when you do a search on the board you will find complete matlab routines posted on how to calculate SNR, THL, SFDR......