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PLL lmx2326 Help

Discussion in 'Electronic Basics' started by Hervé, Dec 10, 2003.

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  1. Hervé

    Hervé Guest


    I plan to use a LMX2326 (NS) with a large bandwidth VCO (zcomm v674me02).
    I don't want to use an active loop filter, but my VCO needs Vtuning from 1
    to 14 V.

    Can I use a passive loop filter when connecting VP (on lmx2326) connected to
    +15V dc ?


  2. kansas_ray

    kansas_ray Guest

    The Vp limit of the LMX2326 is +5.5V max so connection to +15 is not
    possible. I don't see how to avoid an active loop filter with the Zcomm part
    and it's not really that big a deal.

    You could roll your own VCO but personally I'd rather wrestle the active
    loop filter than the problems you are likely to encounter with a home-made,
    +5V-tuned, 1.7-2.5GHz VCO.

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