HMC834

I use FPGA to control HMC834,HMC834 is in the metal box,the fpga is outside,

when i turn on the power supply ,the fpga can control HMC834,

but sometime i turn on the power supply,the fpga can not control HMC834,then HMC834 can not work all the time while i change the frequency by using FPGA ,

if the time i turn on the power supply ,the fpga can control HMC834,the it can work well.

it's not stable ,how should i do

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