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Did you mean CMRR? If so, it stands for Common Mode Rejection Ratio, and it is a measure of how well the amplifier rejects signals that appear on both leads. The idea is that an amplifier should amplify the (Differential Mode) signal, but not any noise (Common Mode) that might appear on the lines, perhaps due to induction from nearby AC power sources. Since induction will show up on both leads, a high CMRR amplifier will have a greater signal to noise ratio overall.
If you meant CCMR, please say that in the discussion or the answer, and we can split the question. I don't recognize CCMR.
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∙ 13y ago
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