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what is the principle of sigma-delta adc?

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zenisle

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what is the principle of sigma-delta adc?
 

it is oversampling + soise-shaping (negative feedback)
 

over-sampling spread the noise, the loop forms a high-pass filter for noise, then a decimation filter or a low-pass filter gets rid of high-frequency noise.
 

Here is a good article.

**broken link removed**
 

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