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HELP, Question about Sigma Delta Bandpass MASH structure!

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skyrivers

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im using MATLAB sigmal delta toolbox to implement a sigma delta bandpass structure. (Center frequency is 1MHz, sampling frequency is 25MHz, bandwidth is 100kHz). Now i have the simulation result of a 8-order bandpass structure (the ABCD Matrix).

my questions are:
1:is this stucture with the coefficient a,g,b,c, stable?
2:can i change the original structure (the CIFB or CRFB) with the coefficient into Mutistage(MASH) sturcture and how can i do that?
3:i just don't want the centre frequency at one-quarter of the sampling frequency, but many books and documents do that. how can i get the NTF just without matlab toolbox?

thanks a lot.
wating for your answer.
 

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