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Eval-AD9914 board generates linear frequency sweeping

Question asked by XoX on Apr 18, 2018
Latest reply on Apr 25, 2018 by mcee

In past days, I tried to generate a linear frequency sweeping from 130MHz to 630Mhz with the Eval-AD9914 board to a mixer to get a differnce frequency signal . It seems that the sweeping signal I got was not of enough good linearity. As result, there existed spurs and sidelobes in my difference frequency signal, as I paste in index.

The question is that what I need to do to get a  clean  differnce frequency signal .Can I use Eval-AD9914 board  to generate a good linear frequency sweeping signal.