PLL pull in range

Discussion in 'General Electronics Chat' started by samiscool, Feb 16, 2009.

  1. samiscool

    Thread Starter New Member

    Feb 16, 2009
    3
    0
    Dear all,

    Im currently working on a PLL (phase lock loop) project and i would like to ask how do i measure the PLL pull in range using a simulator software called Cadence.

    I would like to know :
    1. What are my measure points (input output).
    2. What are the measure procedures needed (something like a lab procedure).
    3. What is the measured unit?( should it be in freq unit or just a range)

    Thanks......

    Your help is deeply appreciated.[​IMG]
     
  2. bertus

    Administrator

    Apr 5, 2008
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  3. samiscool

    Thread Starter New Member

    Feb 16, 2009
    3
    0
    I would personlly like to thank bertus for such a good reading material.

    But i would like to ask regarding proper steps to actually measure pull-in range for a PLL. Hopefully theres a guide to it.
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    You may need to consult the data sheet for a specific PLL. No generalized answer may exist, although you may find there is some convergence of range for most PLL's.
     
  5. samiscool

    Thread Starter New Member

    Feb 16, 2009
    3
    0
    This is currently a new measurement given by my supervisor.

    To simulate AC response on loop filter for PLL using
    a. input AC current.
    b. output AC voltage.

    Does this mean i have to obtained the phase and gain using both of this inputs?

    I find this weird coz from my previous experience .......gain = Vout/Vin but using input AC current?
     
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