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HMC704 for help

Question asked by WayneQ on Nov 26, 2014
Latest reply on Dec 11, 2014 by WayneQ

Hi, supporter

I am using HMC704 recently,I met an trouble that  sometimes HMC704 out of frequency lock,but in most case the frequency is locked,I used FPGA to transfer the SCK,SDI and SEN signal ,when the frequency is not locked,pin12 of HMC704(BIAS) is pulled up to 3.3V,and the total current reduced rapidly,while its default reference voltage is 1.92V,I configure the peripheral circuit follow your schematic diagram, so I do not know why it becomes ,can you give me some tips,if you give me the internal circuit diagram of BIAS(pin 12),I will very appreciate.
  Emergently and Sincerely