Re: snr
Hey,
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.
Regards,
TS