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Sep 18th, 2020, 1:59am
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DAC noise analysis? (Read 404 times)
Jacki
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DAC noise analysis?
Dec 11th, 2019, 1:13am
 
Hello,

   When we do the noise shaping, we need a DAC in the feedback loop and add the output of the DAC to the input of the sigma-delta modulator. Most of the time, we focus on the quantization noise in the ADC, but I wonder how about the noise from the DAC since its noise will be added to the input directly. Is it the same as the quantization noise or some other noise also become important.
   Thank you very much for your knowledge and sharing.
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Jacki
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Re: DAC noise analysis?
Reply #1 - Dec 13th, 2019, 2:41am
 
I think if there is no excess loop delay, and with an ideal DAC, the DAC will form the original analog signal, and its noise is mostly from DAC like the thermal noise. hence the nonlinearity and excess loop delay are more important for the DAC design.
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neoflash
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Re: DAC noise analysis?
Reply #2 - Jan 6th, 2020, 9:08am
 
For SDM, DAC noise analysis is well studied in text books from Temes. Just read it.
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