I am trying to use the EVB with an external phase detector and loop filter (OPAMP based). So far, it seems like the PFD works correctly with the N Devider Output of the EVB. But the PLL doesnt lock.
I have tried to synthesize a frequency of 6GHz, but the VCO Output frequency was around 3 GHz. I guess there is an internal VCO selection that is not compatible with using external devices.
So my question is: Is there a possibility to select the VCO manually with the help of the evaluation board software ?
thanks in advance and best regards,