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measuring LVDS signal

Discussion in 'General Electronics Discussion' started by Maria, Sep 15, 2015.

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  1. Maria

    Maria

    1
    0
    Sep 15, 2015
    Hello
    I would like to measure a LVDS signal, on the board that is sending this signal. There are two signal pins on this board for this signal, signal-p and signal-n. How can I measure this signal? Can I use single ended probes and an oscilliscope? I tried to do that but I can't find a signal. Am I making a mistake in measuring this way (what if so?) I don't have differential probes and they are expensive, is there another way?
     
  2. AnalogKid

    AnalogKid

    2,375
    661
    Jun 10, 2015
    If you want to see the two LVDS signals independently, you can do that with a high speed, low capacitance scope probe. Note that in some cases the signals are less than 0.5 Vpp and could be hundreds of MHz. If you want to see the logic state represented by the differential signal, or ah eye diagram, that takes a logic analyzer or a newer scope with this function built in.

    ak
     
  3. GPG

    GPG

    452
    66
    Sep 18, 2015
    If you have a dual channel scope that has an add button and an invert button you can take differential measurements.
     
    davenn likes this.
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