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difference between pll and dll??

Discussion in 'Electronic Design' started by topgun, Jul 7, 2005.

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  1. topgun

    topgun Guest

    Hi all,

    Can anyone please explain the basic difference
    between a pll and a dll with some theory ...



    Thanks
    Sj
     
  2. Paul Burke

    Paul Burke Guest

    Never load a PLL onto your Windows system, as the results will be
    disturbing. It may even wreck the drive and fill it with small bits of
    mashed plastic and metal.

    On the other hand, never try to multiply your clock frequency, or
    demodulate FM, or anything like that, with a DLL, as you'll find it
    difficult to attach the wires.

    Paul Burke
     
  3. hehe. Perhaps you could design the DLL as loadable into an FPGA...

    Jon
     
  4. Bob Stephens

    Bob Stephens Guest

    tee hee. So much for the 'there are no stupid questions' scenario...


    Bob
     
  5. Hey,
    An article on DLL and PLL in the context of pure digital systems:
    http://www.techonline.com/community/ed_resource/feature_article/14627

    A biased view from Altera but it does outline the differences between
    the two:
    http://www.altera.com/literature/tb/tb60.pdf

    The basic difference is that a PLL is actually synthesizing a clock
    (e.g. with some sort of VCO) and phase-aligning it with an incoming
    clock, whereas a DLL is adjusting the delay on a clock to keep it in
    phase with another clock (possibly at a multiple or divided frequency).

    greetings,
    Tom
     
  6. Andrew Holme

    Andrew Holme Guest

    This document is the top Google hit for "delay-locked-loop"

    http://www.xilinx.com/bvdocs/appnotes/xapp132.pdf

    See page 2 for an answer to your question in the context of FPGA clock
    distribution.
     
  7. Rich Grise

    Rich Grise Guest

    The difference between a phase-locked loop and a dynamic
    link library?

    Well, one thing that springs to mind is that one is hardware and
    the other is software...
     
  8. Paul Burke

    Paul Burke Guest

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