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The Designer's Guide Community Forum › Design › Mixed-Signal Design › Tones in the spectrum of Sigma Delta Modulator
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Tones in the spectrum of Sigma Delta Modulator (Read 11151 times)
jefkat
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Re: Tones in the spectrum of Sigma Delta Modulator
Reply #15 - Sep 19th, 2011, 7:08am  
Input signal is 1.0V differential.
SNDR is 82dB.
An alternative to DEM is used
3rd order non linearity approximately 84dB below carrier...
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harpoon
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Re: Tones in the spectrum of Sigma Delta Modulator
Reply #16 - Sep 19th, 2011, 7:37am  
may I ask what "alternative DEM" method you used ?

The results you posted are certainly respectable ...

what is the worse SNDR (sample to sample) did you see and what is the maximum bandwidth of your SD-ADC ?

in any case ... well done !
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jefkat
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Re: Tones in the spectrum of Sigma Delta Modulator
Reply #17 - Sep 19th, 2011, 9:03am  
I would publish and let you know the technique Smiley
I yet have to do measurements to check variations
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