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Sigma Delta output spectrum (Read 2217 times)
Sarig
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Sigma Delta output spectrum
Nov 15th, 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
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sheldon
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Re: Sigma Delta output spectrum
Reply #1 - Feb 19th, 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
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