Max number of samples for a FFT in STEMlab 125-14

[javiruni10]

Hello, i am working on a project for performing a FFT on a STEMlab 125-14 (as can be seen from my various posts on the forum. Sorry for that!).

I am trying to perform an FFT with different input signals, ranging from 100 Hz to 10 KHz os the like. The thing is, working with the ADC sampling rate from the 125-14, which is 125 MHz, i would need to acquire 1,25MS for a single period of a 100 Hz input signal, and be able to perform the FFT.

Would that many samples be ok? Is there any suggested architecture to get that done?

Thanks in advance.

[juretrn]

Hi,
are you sure you need to work at the full data rate when acquiring such a slow signal? You could try decimating the data at those rates and take the decimation into account when calculating the FFT.

There is no way you could store ~2MB inside of a Zynq 7010 or 7020. The only option would be to store the data into RAM using the AXI HP ports.