polyam
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Hi,
I've designed a delta-sigma DAC. My reconstruction filter has a pass-band frequency of 10 MHz and a stop-band frequency of 100MHz. My delta-sigma is clocked at 800 MHz for an OSR of 128. So the BW is about 3MHz. Now the question is that in which bandwidth I should calculate the SNDR? 3MHz of fs/2=400MHz. If I calculate it over 3MHz I'll have SNDR=101 dB. If I calculate it over 400 MHz it will be 38 dB. Which one is correct?
tnx
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