Forum Discussion
Altera_Forum
Honored Contributor
Honored ContributorHelp with altera FFT
hello; what i want to do is to get spectrum of an sinusoidal signal using the altera fft core i have generated a v8 fft with the following setting: fft point : 64 (to start with) archi...
Altera_ForumHonored Contributor
Honored ContributorHowever, my suspicion now is that the fluctuating amp is due to one or both of the following:
1) wrong fft scaling 2) fft and its scaling ok but your test is misleading as you may be injecting the analog sinusoid with different phase each fft block. Your fft resolution is too low, it is better to have many sinusoid cycles per fft block rather than just one cycle as phase changes become exagerated. So either increase the fft resolution to say 2048 and/or increase the speed of your sinusoid.
