Forum Discussion

Sean2's avatar
Sean2
Icon for New Contributor rankNew Contributor
4 years ago

FFT IP not behaving as expected.

I'm trying to use the FFT IP on Quartus Prime Pro 18.1 to do an inverse fft. When I input an fft of a signal I created in Matlab that has a frequency of 23, I do not get the expected output signal. W...
SengKok_L_Intel's avatar
SengKok_L_Intel
Icon for Regular Contributor rankRegular Contributor
4 years ago

Is the input data compliance with the single floating-point format? Does it work well with FFT before proceeding with iFFT? How about if change the input order to natural?


Sean2's avatar
Sean2
Icon for New Contributor rankNew Contributor
4 years ago

When I use a testbench with just an FFT IP instead of an inverse FFT, I get the expected output of a spike at 23 after using Matlab code on the output to rearrange the radix-4 digit reverse order. However, when I hook up the FFT IP to the inverse FFT IP through Avalon streaming, the fft produces a different output.