Berti
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Hi,
the name of the book is "UNDERSTANDING delta-sigma data converters". I think the difference is that in fig 3.6 the spectrum is shown using averaging (uncorrelated noise is reduced and the tones are better visible), while in fig. 2.20 no averaging is used and it is therefore hard to distiguish between noise and tones.
But in general a first-order modulator is worse than second-order in terms of tonal behavior.
Regards
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