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A Question About Delta-Sigma Modulators

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naalald

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Hi,
What is the difference between the two configurations below?




Is there any difference putting the coefficients before or after the integrator as in the figures?
 

Can their transfer function be the same??
 

I think it depends on ease of implementation.For example, a particular configuration may be more easy to implement in a Switched capacitor implementation whereas something else may be useful for digital filter implementation.I am not an expert in either, so wouldnt comment further,
 

if a1 and b1 in the 2nd plot are the same, the two configurations are the same. if not so, a1 in the 2nd plot can be changed based on the input signal, this is its flexibility.
 

In fact, you know.
these factors denote the weight of the signal,
different factors represent different structures, ie, different transfer functions
 

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