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How does a delta sigma DAC work?
How does a delta sigma DAC work?
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Old 4th June 2003, 10:35 AM   #21
phase_accurate is offline phase_accurate
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Join Date: May 2002
Location: Switzerland
The intergrator is put between the feedback summing circuit (you may of course use a summing integrator as well) and the comparator.

For higher SNR you use multiple cascaded integrators.


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Old 5th June 2003, 05:29 PM   #22
ojg is offline ojg
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Join Date: May 2003
Location: Norway
This seems like a good thread to post my question in.

I have looked at the datasheets for the PCM1738 and the PCM1792, but they only show the frequency spectrum out to 100kHz. I can see the effect of noiseshaping, since the noisefloor increases after 20kHz and is then flat out to 100kHz.

I know that the spectrum repeats for each 8*fs (8*96=768kHz), but what happens between 100kHz and 768kHz? Is the noisefloor still flat or does it increase? Reason I would like to know is that it would affect the design of the post-dac filter.
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