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Altera_Forum
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15 years ago

Help with FFT megacore .mdl design

Would anybody mind taking a look at my .mdl for me? I'm trying to get the spectrum of a sine wave source block and there seems to be a lot of noise. I'd like to have a solid plot of the spectrum in ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

I attached the spectrum of a 64 point streaming arch. transform on a sine wave at 12.5 MHz. I plotted it in MatLab with an FFT shift and without scaling. I wonder if there is an overflow, without the FFT shift the spikes occur at the ends of the spectrum, the data shifts as I change the frequency but for the large part isnt accurate.

Any body have any ideas with whats going on? :confused: