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    Verification of FFT comparision with matlab

    hi all, I completed coding FFT using verilog. I am verifying my output with matlab inbuilt fft operator. As my N (no' of samples are parametrized) for small values of N there no much difference but for N = 512,1024.. some values having difference of +/- 9. I plotted frequency waveforms for my FPGA output and matlab outupt the wave forms are giving fine(preserved frequency).

    my question is that my verification is fine and my output is correct or not ( I used cordic algorithm for generation of twiddle factors)
    I am attaching matlab output and fpga output please refer

    please help,
    thanks Click image for larger version. 

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    Last edited by achaleus; 3rd May 2013 at 06:27.

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