REF=80MHz,FPD=80MHz, Fout = 3665M, Nint = 45,The real Nfac value is 24'hD00000,But I set the value is 24'hCFFFF1,
I find the spur is Near main signal, As shown in the picture;
It's not like a power spur, when i set the Nfac is 24'hD00000,these spur disappear. But the spur appears in the offset main signal of more than 400 kHZ.; When I change the FPD is 40MHz, spur does not appear at the same frequency point,I don't know Why?