When you are simulating, do you have the fftshift set appropriately? A pure sine wave will be the worst case for bit growth and overflow, so you'll want an fftshift of 0xffff I think. On Nov 2, 2014 2:11 AM, "Wang Jinqing" <jqw...@shao.ac.cn> wrote:
> Hi, > > I can run the tut3.mdl,but I found the simulation result of wide_band fft > is not correct. For example I have generate a sine (freq= 1/4pi)wave input > the KaADC ,I found the polyphase output sine wave is still ok on the scope, > but after the wide_band_real fft ( after real and image parts seperation) > and power I even can't find the corresponding spectrum line. There're many > messy signals on the spectrum. It seems that the fft core not works well in > simulation. Does someone run into this problem? > > Best Regards. > > Oliver Wang. > > > >
