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Loop Filter for HMC439QS16G

Hello,

I have HMC586LC4B (VCO), HMC434 (Freq Divider by 8), and HMC439QS16G (PFD). I want to build FMCW chirp 4.5 - 5.5Ghz and I have generated chirp 562.5 - 687.5 MHz as reference. But I have no idea about designing the Loop Filter to bridge my PFD and VCO.

Do you have any papers or references that I can delve into? 

Thanks a lot