Hi,Does the struction of ADF5901 is a PLL or it just an open loop VCO?
I notice that ADF5901 need a REF input ,and the REF input and VCO feedback go into the VCO CAL together.Does the VCO CAL just a phase detector?
Look forward for your reply.
The VCO on the ADF5901 is open loop, the PLL is external, typically ADF4159 for ramp generation.
The VCO CAL block calibrates the VCO ensure the it frequency is centered in Vtune range.
ok, i get it. Thank you
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