I use ADIsimPLL to simulate ADF4106+V940ME28-LF. The ouput frequency is 6GHz, PFD is 2MHz and REFin is 26MHz.
Kv of V940ME28-LF is 85MHz/V and input capacitor is 50pF.
When I input the input capacitor of VCO, it is shown that "Error 608: VCO input capacitance too large for this design."
Could you please help clarify why the error message comes out?
Thanks in advance for your help!