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PLL loop filter help

Discussion in 'Electronic Design' started by frank, Sep 16, 2003.

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  1. frank

    frank Guest


    Does anyone of a good online reference that explains and has the
    equations for PLL bandwidth, damping factor, loop filter natural
    frequency, settling time and other such parameters important to PLL
    design. I found several references but none are to my liking so far.

  2. All the ones you have mentioned are not specific to PLLs. They are
    generic to any feedback system. So, look up "feedback control theory",
    or something similar.

    Kevin Aylward
    SuperSpice, a very affordable Mixed-Mode
    Windows Simulator with Schematic Capture,
    Waveform Display, FFT's and Filter Design.
  3. Active8

    Active8 Guest

    did you check the motorola app notes for an-535 and an-1207? aside from
    that check what kevin said. a google of "Nyquist Stability" returned a
    nice article. something like EE214 handout X and #17. X is Nyquist
    stability and #17 is feedback theory.

  4. Jim Thompson

    Jim Thompson Guest

    See "PhaseLockedLoopAnalysis.pdf" on the S.E.D/Schematic page of my

    This analysis dates to around 1966-68 and is with an *analog* phase

    (I save everything ;-)

    ...Jim Thompson
  5. I remeber having to completely analyse a PLL as part of the first-year
    electronics course as a physics student.
    We had a little "electronica practicum" book which explained the PLL with
    lots of details.

    I tried looking for it, but cannot find it anymore (should be somewhere in
    the box labeled: 12 year old stuff), but maybe you can find a second year
    physics student at "TU Delft, the Netherlands" somewhere on some mailing
    list, and ask him/her to scan it for you, they probably still use it.
  6. Not exactly what you requested but there is a good (and free) PLL simulation
    software available on analog device web site. (

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