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SNR of digital sigma delta modulator

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nishagajare

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i hv written code for sigma delta modulator of DAC in Matlab, i m taking input frequency 20khz and nyqiust frequency 48khz,over sampling ration 128.i got spectrum of modulator using hanning window with frequency 3000(normalised frequency) but really i confused how to measure SNR of this output spectrum in Matlab plz help me...............
 

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