[SI-LIST] A common mode current on differential PCB pair cause EMI?
- From: Tesla <emcesd@xxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 19 Dec 2012 11:01:51 +0800 (CST)
HI, Experts.
Suppose a differential microstrip trace pair on PCB with complete GND reference
plane.
I was told that the common mode on that pair casue EMI issue.
But i think the differential pair, also are two independant microstrip traces.
If common mode on this pair cause EMI, then a single TML also cause EMI. But a
micrstrip does not cause much EMI in my limited knowledge(This assumption may
be wrong).
So i think the common current on PCB with complete GND reference plane does not
cause EMI,it may be harmful to the differential amplifier in receiver.
Thanks.
Tesla
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