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Design >> Analog Design >> Sigma Delta output spectrum
https://designers-guide.org/forum/YaBB.pl?num=1195169046

Message started by Sarig on Nov 15^th, 2007, 3:24pm

Title: Sigma Delta output spectrum
Post by Sarig on Nov 15^th, 2007, 3:24pm

Hello,
I fail to understand. why when looking at Sigma Delta output spectrum I see that the noise reach ~-40dB at its maximum. how do I calculate this maximum ? why it is not 10log(1/12fs) ?

Thanks,
Erez

Title: Re: Sigma Delta output spectrum
Post by sheldon on Feb 19^th, 2008, 7:06pm

Erez,

The most likely explanation is that numerical noise is being introduced during the
conversion from time to frequency. You can see the following link for some hints
about how to effectively simulate Sigma-Delta converters.

http://www.designers-guide.org/Forum/YaBB.pl?num=1143013397

Best Regards,

Sheldon