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65 Mhz jitter measurement

Discussion in 'Electronic Equipment' started by Antonio Pasini, Dec 3, 2003.

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  1. I'd like to measure jitter (cycle by cycle, rms, pk-pk) on a LVCMOS
    oscillator, 65 Mhz.

    I have is a Tek 3054B...

    I didn't found a clear explanation on tek website of the options I could
    purchase, if any...

    What could I use ?

    Low cost is a concern... :)
     
  2. Bill Janssen

    Bill Janssen Guest

    One way is to compare a delayed signal and the non delayed signal in a
    mixer. The output of the mixer
    is the jitter signal.

    Use a splitter to get two signals with the same phase. Use a section of
    able to delay one
    signal 45 degrees. Compare those signals using a double balanced mixer.
    The output signal
    the can be displayed on a scope or AC meter etc.

    Good luck.

    Bill K7NOM
     
  3. JS

    JS Guest

    The 3054B has a very short memory and no statistics on the measurements
    it takes. It has a pretty high trigger jitter - around 300 ps or greater
    which is why the cleanest signal gets pretty wide and thick when you
    watch it with persistence turned on.

    Perhaps you can rent or borrow a scope already programmed to take
    jitter measurements?

    Some of the concerns and recent developments related to jitter
    measurements are posted at http://www.qsl.net/wd1v in the Scope FAQ
    section.

    Best regards,

    John
     
  4. I'd like to measure jitter (cycle by cycle, rms, pk-pk) on a LVCMOS
    Agree, will be the best solution. I'm already looking around...
    The http://www.qsl.net/wd1v link is very interesting, also.

    Thanks!
     
  5. ddwyer

    ddwyer Guest

    For the purposes of comparison I would suggest a frequency domain
    measurements i.e. a synthesised receiver or spectrum analyzer or perhaps
    just a modulation meter.
    Look at the residual fm.
    conversion from frequency to time domain to be made employing Alan
    Variance.
    See mr Allen's excellent web page
     
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