I'm back to work with the FFT core , even after some debugging for the core i still have the same problem here , which is no peaks at the output of the FFT except a peaks at 0 and the N-1th points of the frame , which are the first and the last points ! These results makes no sense and up to now i couldn't find any way to solve it , i have tried to scale the FFT and to control the input data which comes from the XADC , and many other ways but i still have the same problem .

The picture below shows the results and the output of both XADC and FFT , which the sampling freq of the XADC is about 960 KSPS and i applied all the possible fundamental freqs starts from 10khz up to 480 Khz which is the maximum i can use , and i have tried the FFT core with scaled and unscaled mode , with natural and reversed order at the output , while i have tried the streaming and real time mode without changing , but the results are still for all cases above .

Please if someone can helps me to know what's the problem here i would appreciate the help really .

Note : the results shown in the pic below are not from the simulation , but they are real results taken by the ILA debugging core .

Hello everyone

I'm back to work with the FFT core , even after some debugging for the core i still have the same problem here , which is no peaks at the output of the FFT except a peaks at 0 and the N-1th points of the frame , which are the first and the last points ! These results makes no sense and up to now i couldn't find any way to solve it , i have tried to scale the FFT and to control the input data which comes from the XADC , and many other ways but i still have the same problem .

The picture below shows the results and the output of both XADC and FFT , which the sampling freq of the XADC is about 960 KSPS and i applied all the possible fundamental freqs starts from 10khz up to 480 Khz which is the maximum i can use , and i have tried the FFT core with scaled and unscaled mode , with natural and reversed order at the output , while i have tried the streaming and real time mode without changing , but the results are still for all cases above .

Please if someone can helps me to know what's the problem here i would appreciate the help really .

Note : the results shown in the pic below are not from the simulation , but they are real results taken by the ILA debugging core .

Regards all .

Mohamed

## Share this post

## Link to post

## Share on other sites