[SI-LIST] Re: How to use common mode chock to elimate Common-mode noise ?
- From: "Ingraham, Andrew" <a.ingraham@xxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Thu, 9 Oct 2003 14:49:32 -0400
> I have one question from Ethernet design of Transformer which was
> said could eliminate Common-mode noise. But I saw its equivalent
> circuit designed just like two Inductance, so I have no idea about
> why Transformer can eliminate Common-Mode noise?
They are not two independent inductors. They are tightly coupled to one
another.
They form a high impedance to common-mode signals, so they tend to block
them. They are a low impedance to normal differential-mode signals.
Regards,
Andy
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