hmc439 loop filter design

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.

Thanks,

AB

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  • Hi.

    I'm using the HMC439 as well, and found your app note very informative... thanks!

    I'm using the HMC439 in a circuit that locks the phase of two signals with the same frequency (110MHz). The VCO is replaced with a phase shifter. My question is what value do I enter into the "VCO Gain (Hz/V)" field in the main window? The shifter I'm using has a slope of approximately 50Deg/V at the nominal control voltage and operating frequency.

    Regards,

    Marc.


Reply
  • Hi.

    I'm using the HMC439 as well, and found your app note very informative... thanks!

    I'm using the HMC439 in a circuit that locks the phase of two signals with the same frequency (110MHz). The VCO is replaced with a phase shifter. My question is what value do I enter into the "VCO Gain (Hz/V)" field in the main window? The shifter I'm using has a slope of approximately 50Deg/V at the nominal control voltage and operating frequency.

    Regards,

    Marc.


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