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HMC833 unlock @ special frequence

I have designed a circuit board about hmc833. The hmc833 worked very well. For some other reasons, I design another  board again. this time,my hmc833 has a big  problem. It is unlocked at some frequences. For example , I use the frequence between 2 and 6G.  between those frequence , there are 5 frequence point is unlock. Others is good. The hardware and the program  is the same as forward . I has made much try.But it does't work. Can you give me some suggestion about this .

                        Look forward to  your suggestion .

                         best regards

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