Quartus FFT IP output problem

Discussion in 'VHDL' started by patrick.melet@dmradiocom.fr, Feb 9, 2007.

  1. Guest

    hi,

    I use the FFT IP from Quartus 6.0 with 16 bits input data and 16 bit
    twiddle and 1024 pts in streaming data flow

    Before sending data to the FFT I make a flat top window on my samples

    My frequency sampling is 10 MHz and I send a pure 1MHz sinus to the
    real input, with 0 to the imaginary input...

    When I compute Re[X(n)]^2+Im[X(n)]^2 (magnitude squared) I see an
    amplitude variation on this output from a FFT result to another FFT
    result, there's an amplitude modulation on my output...

    Do you know if you have already notice this ?

    Thanks
     
    , Feb 9, 2007
    #1
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