about sigma delta filter bit-wdith -

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I am working on the Sigma delta ADC project, and need to decide the bit-width of the digital filter. In the four stages of my filter, first is CIC and the bit width according to the OSR is 29 beats. My final filter output is only 24 bits, so this means that the other 3 FIR filters need to reduce the total to 5 bits. If my input is 4-bit signed and output 24 bits are signed, then how do OSR = 256, bit filter of each 3 filter be fixed? Any effect on the effect of the performance due to bit-width?

I think your problem may also be domain-specific for the stack overflow. I do code myself based on DSP, and I have only the least understanding of what you are asking for. KVR is audio where you can get some help with this problem.


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