to get an idea about cic filters

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From the attached image of cic filter can any body give idea about to write vhdl code for cic filter.
 

Referring to a previous thread of yours
i have studied meyer bases book on "dsps with Fpga" . I want the block diagram of cic interpolation . At the same time can anybody give the idea about how to write a vhdl code for the cic interpolation filter.
Click to expand...
There are VHDL code examples in the book. Others have been posted at Edaboard before, and much more can be found on the web.
 

FvM said:
Referring to a previous thread of yours

There are VHDL code examples in the book. Others have been posted at Edaboard before, and much more can be found on the web.
Click to expand...

I am attaching an file in that see the bit growth part and can you tell me to handle 48 bits is it possible in vhdl coding especially for fpga device.Is there an ip core to do this accumulation job so that we need not write code for cic comb and integrator sections?
 

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  • cic2.pdf
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  • CIC_interpolator.svg.png
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  • 00466647.pdf
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The full bit width will be only needed in the first integrator stage, in the succeeding stages it can be reduced according to Hogenauers pruning calculation based on SNR condiderations. 48 bits isn't a problem for VHDL adders/subtractors.

I don't see the second paper related to CIC design at all, it's talking about multiplier resource reuirements of FIR filters.

FPGA vendors like Altera and Xilinx have CIC IP that's easy to use. In my view, a basic CIC can be coded from the scratch without much problems. I also did it when I started with CIC many years ago.
 


Can you give me the code for cic filter which you have did?
 

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