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Need explanation about Common mode signal

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mkrtich.nazaryan

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Hi all,
I'm reading one book now about signal integrity and met one interesting sentence. A little part from the book:
"The two most common sources of EMI are the conversion of some differential signal into a common signal".
Can anybody explain the meaning of above mentioned sentence?
Thanks.
 
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Hi;
Differential signalling there are two signal traces (ie clk_positive and clk_negative, they are inverted/180deg phase shifted each other), receiver end use a differential amplifier to recover signal. In this system positive signal reference is negative signal.
In common mode, you have one signal and a common signal which is ground and connected within the whole system. Receiver end recovers incoming signal keeping the ground as reference.
Sentence try to explain this conversion may introduce some EMI.
Have a look at this link, **broken link removed**
Hope helps
 
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