Do you plan to incorporate a VCO of Hittite to ADIsimpll?
I want to see the simulation data of the HMC739 and the ADF4159.
I've added a HMC739 model.
Let me know if there's any issues.
All Hittite VCO datasheet can be taken from the VCO datasheets. You can get the datasheets here: http://www.analog.com/en/products/rf-microwave/vcos-plos/vcos-plos.html
In ADIsimPLL, create a new VCO by clicking Libraries > VCO Library Editor > create a new VCO. See the Help file for more information.