Hi All,

In p202 of "Delta-Sigma Data Converter: Theory, Design and simulation" by Norsworthy, Figure6.6 show a cascaded (1-1-1) modulator. But deriving the formula, it seem that it can not canceled the quantization errors in the first and second stages.  If we remove the unit delay between stages, it will be O.K.

I also found the reference paper(ref[6]) of this chapter, it doesn't have such delay units.

Is it the error of the book?

Thanks
GaAs