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CCMRR Common to Common Mode Rejection Ratio

  1. Nov 20, 2008 #1
    I understand Common-mode rejection ratio. I do not however understand common-to-common Mode rejection or common to differential mode rejection or differential to common mode rejection. I am looking at this in regard to twisted differential pair cabling, specifically jacks. I can find the term here and there but no clear definitions or examples.
     
  2. jcsd
  3. Nov 21, 2008 #2

    es1

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    CCMRR is basically the same as CMRR but it's for differential output amplifiers. This parameter lets you predict how much of the common mode signal at the input will be passed to the common mode signal at the output. For a description of differential output signaling you can review this.
    http://www.latticesemi.com/lit/docs/appnotes/pac/an6019.pdf
     
  4. Nov 21, 2008 #3
    Thanks for the start. I am lookin for a technical answer though. I understand differential signaling and all. I just don't understand CCMRR the difference between DCMRR and CDMRR. Maybe someone could explain how you test for it. Any help would be appreciated.
     
  5. Nov 21, 2008 #4

    dlgoff

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    Here's a site where someone plays with balanced line drivers and makes measurments of CCMRR, CDMRR and DCMRR. He shows the formulas relating input and output common mode signals.
    http://sound.westhost.com/balance.htm
     
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