AnsweredAssumed Answered

Phase noise spec of HMC767, HMC778

Question asked by jhshin on Dec 3, 2017
Latest reply on Dec 5, 2017 by MRichardson


My customer wants to change the REF clcok of HMC767 and HMC778 from 50MHz to 10MHz.

In the case, the customer has some questions about phase noise spec on datasheet.

    1. At REF 10MHz, unwanted spur signals were observed in SSB Phase Noise specs of datasheets as below


          Could you please provide a design guide to minimize or eliminate the unwanted signal ?

      2. In another SSB Phase Noise specs of datssheets, unwanted spur signals were not observed as below


            What is the difference between the above spec and this spec ?

       3. In addition, could you please provide a design guide for thermal of high frequency PLL devices ?


Thanks a lot.