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Altera_Forum's avatar
Altera_Forum
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17 years ago

Help 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_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

I have a different but probably somewhat related question. I have a continuous digitized 1000Hz sine wave going to the FFT input. The FFT is configured with a streaming architecture. I get the expected two (almost identical) peaks from the output-one at the positive side and the other at the negative side. My question is how come the values for the peaks fluctuate constantly. In other words, the amplitudes for these two peaks keep changing, and the difference between the maximum and minimum amplitude is quite large.