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PLL in rf signal generator

Discussion in 'Electronic Design' started by sperelat, Sep 12, 2007.

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  1. sperelat

    sperelat Guest

    What I;m doing now is doing test of a rf signal generator.

    My professor might buy it via e-bay.

    When I turned it on, it showed Uncal warning and generated no rf
    signal.

    Meaning of error code was that PLL is unlocked.

    I'm ,however, newcomer to RF generator world.

    ..
    What does "PLL unlocked " means for RF signal generator.

    The model I'm doing test is

    fluek 6060 B
     
  2. Phil Allison

    Phil Allison Guest

    "sperelat"


    ** Means the RF gene is in sulking mode.

    Its sulking cos it don't like being put on eBay when it is stolen property.




    ...... Phil
     
  3. Tim Wescott

    Tim Wescott Guest

    A PLL locks an oscillator frequency to a reference, possibly through a
    frequency divider so it can deliver a variety of frequencies. If the PLL is
    unlocked it means that it can't pull the oscillator frequency in to match
    the reference.

    So either your output signal is the wrong frequency (perhaps very wrong)
    or it isn't there at all.

    --
    Tim Wescott
    Control systems and communications consulting
    http://www.wescottdesign.com

    Need to learn how to apply control theory in your embedded system?
    "Applied Control Theory for Embedded Systems" by Tim Wescott
    Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html
     
  4. Charles

    Charles Guest

    PLLs use a reference frequency, a VCO (or several), programmable dividers,
    loop filters and phase detectors. The basic idea is simple but many
    instruments use loops within loops and swallow counters and the poop hits
    the fan. Not for beginners!

    http://www.cardinalxtal.com/docs/notes/cardinal_phase_lock_loop_basics.pdf
     
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