Hi, when i am trying to set ADF4355-2 at 1801MHz in Fractional Mod i see two moving spurs parallel to each other . What is the behind of this ?
The spur showing in the clip are sometimes know as wandering spurs/moving spurs due to the ADF4355-2 SDM. Most likely occurring because FRAC1 is approximately a factor of MOD1, can you try to reduce the level of the spur by tweaking the bleed current.
If this fails to reduce the spur level, you may need to operate away from that frequency, or change the PFD frequency (using R doubler and divide=3) to change the N divider relationship.
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