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A Question About Delta-Sigma Modulators

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naalald

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Hi,
In the schreier book (2005) page 25, it's said that one of the inputs for which the condition of a white spectrum for the quantization noise is not satisfied, is a periodic signal with a frequency harmonically related to fs (sampling frequency). Now,
1- Does this mean that the sampling frequency should not be a multiple of the input signal frequency?
2- Any articles that proofs it? (In the schreier book there is no proof for that and it's just discussed illustratively)
 

hi naalald,

yes, the sampling frequency can't be a multiple of the input signal frequency.

about it, see Maxim's Coherent Sampling vs. Window Sampling:

**broken link removed**

also IEEE Standard for Terminology and Test Methods for Analog-to-Digital Converters:
 

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    naalald

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