CCMRR Common to Common Mode Rejection Ratio

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Discussion Overview

The discussion revolves around the concepts of Common-to-Common Mode Rejection Ratio (CCMRR), Differential-to-Common Mode Rejection Ratio (DCMRR), and Common-to-Differential Mode Rejection Ratio (CDMRR) in the context of twisted differential pair cabling and jacks. Participants seek clarity on definitions, differences, and testing methods for these parameters.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant expresses understanding of Common-mode rejection ratio but seeks clarity on CCMRR, DCMRR, and CDMRR, indicating a lack of clear definitions or examples.
  • Another participant suggests that CCMRR is similar to CMRR but specifically pertains to differential output amplifiers, noting its role in predicting the transmission of common mode signals from input to output.
  • A participant requests a more technical explanation of the differences between CCMRR, DCMRR, and CDMRR, and inquires about testing methods for these parameters.
  • Another participant provides a resource that discusses measurements of CCMRR, CDMRR, and DCMRR, along with formulas relating input and output common mode signals.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the definitions and distinctions between CCMRR, DCMRR, and CDMRR, indicating ongoing uncertainty and the need for further clarification.

Contextual Notes

Participants have not fully defined the terms or established a common understanding of the testing methods for CCMRR, DCMRR, and CDMRR, leaving gaps in the discussion.

icthyus
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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.
 
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CCMRR is basically the same as CMRR but it's for differential output amplifiers. This parameter let's 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
 
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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.
 
icthyus said:
Maybe someone could explain how you test for it.
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"
 
Last edited by a moderator:

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