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Delta-Sigma Modulators, Feedforward or Feedback??!!

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OpAmp

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best book for sigma delta data modulators

I was wondering if anybody can introduce me a document comparing the feedback and feedforward structures of delta sigma modulators?
I have read the following two books (Delta-Sigma Data Converters by Norsworthy et al and Understanding Delta-Sigma Data Converters by Schreier and Temes) regarding this topic and couldn’t find the pros and cons of the two structures. For higher order delta-sigma DACs, I usually see feedforward structure is used, but I don’t quite understand why!!!
You comments are really appreciated.

OpAmp :)
 

feedforward sigma delta design

less power consumption, less capcitor used
 

feedforward delta sigma modulator

Any more comment???
 

differences feedforward feedback delta sigma

Typically with FF architecture the signal amplitude is smaller at intergrators' outputs, which is good for low VDD designs. And less area as you have only 1 DAC. The drawback is that you have to design an extra summing point.
 

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