How to simulate the SNR of a Sigma-delta modeulator

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ken_cn

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Hi
I have worked out a sigma-delta modeulator, but I do not know how to evaluate its performance. Could you tell me how to get the SNR, by Hspice or Matlab are both ok. Thank you!!

Ken
 

.tran
then do fft analysis.

or
.pss
.pac
.pnoise
by sepctre
 

thanks Sunking!
But how to choose the number of fft pionts. and how to calculate the snr from the fft result?
Thanks!
 

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