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Altera_Forum's avatar
Altera_Forum
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16 years ago

what's wrong with my fft ipcore

I have instantiated a 256 points FFT, with single output and streaming architecture. The data width and twiddle factor precision is 16bits. I input the signals generated by matlab: n=0:2047; s...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

A 256 points FFT has a potential word size growth of log2(256)= 8 bits, because every butterfly in fft algorithm increases its word size 1 bit. So, the sinusoids amplitude should not be greater than 127, in this case.