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Difference between a DLL and a PLL

Discussion in 'Electronic Design' started by bender, Jan 12, 2006.

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  1. bender

    bender Guest

    What is the general difference between a DLL and a PLL?

    Which is better for a high speed, low jitter design?
  2. bender wrote...
    When I think of DLL, I think of Microsoft's #%^&^. When
    I think of PLL, I think of the fine Philip's IC offerings.
  3. Donald

    Donald Guest

    DLL = Dynamic Link Library
    PLL = Phase Locked Loop

    Context would help !!

  4. John  Larkin

    John Larkin Guest

    DLL = delay-locked loop. A time-difference comparator servoes a
    variable-delay element.

    PLL = phase-locked loop. A frequency/phase comparator servoes a
    voltage-controlled oscillator.

    Definitions are subject to flames.

    Neither has an inherent jitter advantage, although a pll can have less
    output jitter than it has input jitter, and a dll usually can't.

  5. bender

    bender Guest

    I did mean delay locked loop and phase locked loop.

    Thanks john.

    I am a little confused by the nomenclature but cant a variable-delay
    element be considered as an oscillator.
  6. Tim Wescott

    Tim Wescott Guest

    Not in a DLL. A DLL just takes the incoming signal and delays it by a
    variable, feed-backable amount.

    A variable delay element can be used to _make_ an oscillator, but you
    need an amplifying element to go along with it.
  7. Jim Thompson

    Jim Thompson Guest

    DLL, Delay Locked Loop, used to edge-synchronize clock distribution in
    a fast multi-chip system.

    PLL, Phase Locked Loop, usually used to generate multiples of a
    reference frequency, however analog PLL's can be used to recover
    signals buried in noise.

    ...Jim Thompson
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