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hmc704 spur

Question asked by on Apr 16, 2018
Latest reply on Apr 17, 2018 by dyoung1

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?