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How to decide delta sigma internal bit

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xzcv

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I have a question
I want to design a delta sigma with error feedback architecture that first stage is 2order noise sahping 1bit and two stage is 3order noise shaping 4bit.
If input bit are 23bits , how to design internal path bits,for example,how many but should be set at integrator input and out ?
 

get the frequency spectrum, then you know the gain. the bit width is input width + gain.
 

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