AnsweredAssumed Answered

HMC439 PLL Loop filter design

Question asked by arvabj on Jan 5, 2015
Latest reply on Jul 27, 2017 by MRichardson

I am re-posting this question, as the earlier one was sent out during the holiday week. Thanks !


I am interested in using the HMC439 Phase-Frequency Detector (PFD) for a PLL application. Our application needs different VCO and narrower loop filter than the one shown in the datasheet (page-7, application circuit). I am not able to find a PLL design tool that will help me plug-in PFD gain/ offset, VCO parameters or loop-bandwidth requirements to calculate RC component values for the loop filter. I downloaded one PLL design tool from Hittite but it does not have a HMC439 PFD model.


I would appreciate any help in designing custom PFD + Loop filter using HMC439 + THS4031 with any off-the-shelf VCO modules.