Berti
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I am not completely sure, but I don't think that a high swing at you quantizer has an influence on stability, since you are free to scale the filter coefficients to reduce the swing (and the filter transfer function will remain the same). However, a high spread in filter coefficients might have an influence on the sensitivity of your loop filter.
In feed-back topologies the coefficients at the input are usually smaller and increase towards the quantizers while for the feed-forward structure it is the other way. But I don't think that this has a big influence on the signal swing before the quantizer because the overall loop gain is the same for both topologies. However, in overload the integrators will start clipping. When using a feedforward structure the feed-forward path can help you to realize a kind of graceful degradation (last integrator clips, but forward-path still exists and will reduce you filter order by one, etc.)
Regards
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