Information about PLDRO design in X-band

Hi all
I want to Build a PLDRO in X-band and I want some information about PLDRO design,including using sampling phase detector,the aquisition circuit for locking and formulas regarding the design.If you have papers regarding this topic let me know.

You can see this paper in July or Agust in the web of Microwave Journal
It explains using SPD(harmonic-mix) phase lock circuit,
what is Phase-Noise, Loop Gain/BW Calc,Search Amp
Acquisition