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JWall40's avatar
JWall40
Icon for New Contributor rankNew Contributor
5 years ago

FFT IP Core - Input and output number format?

I am unsure what data format I should use for the FFT IP core input and what data format it will output I can only find a few references to this topic in the user guide: “Imaginary input data, whic...
CheepinC_altera's avatar
CheepinC_altera
Icon for Regular Contributor rankRegular Contributor
5 years ago

Hi Jack,

Thanks for your update. Sorry as for the delay. I was out for the last few days due to Public Holidays.

Regarding your latest inquiry on iFFT, please see my response as following:

3. This would be very interesting but my data out of the ADC is fixed point and ifft only supports floating point data. I cannot seem to find a way of using my fixed point ADC data in a floating point FFT system?

[CP] For iFFT, it also support Fixed Point. Mind further elaborate on the floating point data only support?

For your information, not sure if you have come across the following simple example design which demonstrate a C10GX Cosine -> FFT -> iFFT -> Cosine data for your reference:

https://fpgacloud.intel.com/devstore/platform/17.1.0/Pro/cyclone-10-gx-fft-to-ifft-with-natural-input-and-output-order-using-cosine-data-example-design-171/

You can try to see if it is helpful.

Thank you.