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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    •  Analog Employees 
    on Apr 29, 2015 3:55 PM

    Hi Marc,

    Although phase is the integral of frequency with respect to time and  you may be able to use the phase shifter datasheet or measure the phase shifter sensitivity at your operating frequency and convert this to MHz/V the HMC439LP4E is a Phase Frequency Detector and specifically designed to function with a VCO and loop filter. When used as a 'Phase Detector' it does not provide the same performance as a mixer would which is what I'd recommend you consider using for your application. Please refer to the FAQ in the attached link. The HMC application is based on the premise that the HMC439LPQ4E is being used as a Phase Frequency Detector.

     

    https://ez.analog.com/docs/DOC-12122

    Best Regards,

    Marty

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  • 0
    •  Analog Employees 
    on Apr 29, 2015 3:55 PM

    Hi Marc,

    Although phase is the integral of frequency with respect to time and  you may be able to use the phase shifter datasheet or measure the phase shifter sensitivity at your operating frequency and convert this to MHz/V the HMC439LP4E is a Phase Frequency Detector and specifically designed to function with a VCO and loop filter. When used as a 'Phase Detector' it does not provide the same performance as a mixer would which is what I'd recommend you consider using for your application. Please refer to the FAQ in the attached link. The HMC application is based on the premise that the HMC439LPQ4E is being used as a Phase Frequency Detector.

     

    https://ez.analog.com/docs/DOC-12122

    Best Regards,

    Marty

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