LvW
Advanced Member level 6
It is approximately 5.2 V
The operating point (biasing) of your loop filter must be selected/designed with respect to the dc input/output requirements:
* nominal input dc voltage - identical to the PFD nominal output voltage;
* nominal output dc level (5.2 volts) - identical to the VCO nominal input voltage.
Remark: Design of the complete loop must consider the inverting characteristic of your filter (as shown in your 1st posting).