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Query about ADIsimPLL's Error Message

Question asked by adi_yu Employee on Dec 2, 2011
Latest reply on Dec 2, 2011 by rbrennan

Hi, there


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!