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LMX2595: Phase sync verification

Part Number: LMX2595

Hi,

We have tested phase sync functionality at 80 MHz RFout by giving external sync pulse as per category 3 requirement, it seems to be working fine. However, our end application lies in frequency range 15 - 18 GHz and we do not have necessary equipment for visually verifying phase sync at these frequencies. Is there any other means to check whether phase sync is happening correctly at > 15 GHz RFout i.e. with VCO doubler? Or do we have to just assume that phase sync will happen at these frequencies with same setup we used for 80 MHz test? Please help.  

Regards,

Karan