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PLL Lock detector

Discussion in 'Electronic Design' started by [email protected], Mar 14, 2006.

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  1. Guest

    Hi All,

    I have a register that name is "PLL Lock detector"

    I think it is a register representing the PLL locks the clock yet or
    not, am I right?

    and we use PLL to lock frequency, how other things know the PLL lock
    yet or not? detect its variation value?

    Thank you very much!

    BR/
    Boki.
     
  2. On 14 Mar 2006 02:43:29 -0800, in sci.electronics.design
    I dont think there is a PLL lock detector register in an 8051


    martin
     
  3. Boki

    Boki Guest

    I didn't say I am using a 8051.. :)

    it is a trasmitter chip, so is it ?
     
  4. Again, the datasheet is probably more
    accurate than my first guess.

    Rene
     
  5. Fred Bartoli

    Fred Bartoli Guest

    Going on that top posting game (which doesn't matter anyway, given the
    highly informative level of those threads)

    But didn't he just told us that he doesn't have a datasheet and he doesn't
    have a part number, either.

    Boki must be AI program setup for dreaming he's designing some electronic
    device.
    Someday they'll program it to design an AI program that design an AI program
    that... and we'll finally know the truth through a Boki message:

    "Stuck overflaw at 12:07. How can expert fix my register.
    I'm frequently locked. PL advice.
    Boki
    "
     
  6. So you have a chip and you cannot provide a typenumber?

    Meindert
     
  7. Guest

    What is commonly done is look at the output of a flip-flop phase
    comparator and if you're not in phase "most of the time" (subject to
    threshold), then you're not locked.

    When you're locked, the output of the phase comparator will be
    occasional blips of correction. When you're not in lock, you get the
    beat frequencies of the divided-down VCO with the reference.

    Many PLL chips use an off-chip capacitor to set the lock-detect
    threshold. While the capacitor is important in setting the threshold,
    this is not something that will help you measure phase noise 80dB down
    and 50Hz away from the fundamental :).

    Look at the NE565 or CD4046 datasheets for some info (and especially as
    you have no datasheets on your parts?)

    Tim.
     
  8. Boki

    Boki Guest

    It is impossible to disclose any information that related to our
    customer.

    Just think about FM transmiter.

    BR
    /Boki.
     
  9. Boki

    Boki Guest

    J.K. Rowling must be your good friend.
     
  10. Boki

    Boki Guest

    I think module provider can't provide enough information, because they
    are not chip designer.


    btw, thanks for your information, I will check it out.
     
  11. Ken Taylor

    Ken Taylor Guest

    Or friend of Yoda be he. Be top-poster are you.

    Ken
     
  12. Ken Taylor

    Ken Taylor Guest

    You need to read that register with something and provide a hardware
    signal if that's what the rest of your circuitry requires.

    Ken
     
  13. Fred Bartoli

    Fred Bartoli Guest

    No, J.K. Flip-Flop.


    --
    Thanks,
    Fred.

    "Boki" <> a écrit dans le message de
    J.K. Rowling must be your good friend.
     
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