[SI-LIST] Re: How to use common mode chock to elimate Common-mode noise ?

  • From: ªü¥È <binchuan2000@xxxxxxxxxxxx>
  • To: si-list@xxxxxxxxxxxxx
  • Date: Thu, 16 Oct 2003 01:59:58 -0000

  Thanks for your response but I want to make sure that does it   
  eliminate those Common-mode noise by the force of Electromagnetic 
  line ?

    How does it work ?

  Thanks,

  Binchuan.wang
  HW EE




-- In si-list@xxxxxxxxxxxxxxx, "Ingraham, Andrew" <a.ingraham@xxxx> 
wrote:
> >    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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