FFT - Xilinx System Generator Block

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Giuseppe Galioto
Giuseppe Galioto 2020-8-25
Hi there,
I'm trying to execute a simple fft example of a pure sinewave using the Xilinx System generator block in Simulink. I already know that the result is a complex number, what I've not found is the right way to plot my results.
I expect, given a sinewave (i.e. at 50 Hz), to have two peaks in my spectrum at -50 and 50 Hz.
My questions are:
  1. Why the fft result is multiplied by a factor given by the number of samples of the transform?
  2. How can I plot correctely the frequency spectrum of the fft result directly in simulink, or in matlab?
I attach the model and the result I obtained, with the complex plot of the fft result and the uncorrect spectrum. The samlipng frequency is 1 MHz.
I wait for some kind help.
Regards,
Giuseppe

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