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Altera_Forum's avatar
Altera_Forum
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15 years ago

Difference between DPLL and PLL

HI!:)

I saw the topic in another webpage with ambiguous answers, I thought It's interesting. So I hope someone to make it more clear. Thanks!

What is PLL ? What are it's applications ?

What is the difference in analog & digital PLL ?

Why in VLSI circuits PLL is used?

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    DPLL (digital PLL) or ADPLL (all digital PLL) is usually referring to a time discrete system. The output signal is updated synchronous to a system clock, thus a timing jitter is introduced for frequencies that aren't an integer fraction of the system clock.

    In my view, the main application of DPLLs is in the generation of low and medium frequency signals.