[SI-LIST] 回复： NEXT and FEXT: Question on relative levels

Hello Charles,

From figure 3.2 of "High-Speed Digital System
Design―A Handbook of Interconnect Theory and Design
Practices", you can find that the inductive and
capacitive crosstalk cancel at far end and reinforce
at near end.

You can also get this from section 5.7.1-5.7.3 in
"High-speed digital design, Dr. Johnson".
  
So it's possible to have NEXT greater than FEXT.

B.R.
Astrom

--- "Grasso, Charles"
<Charles.Grasso@xxxxxxxxxxxx>写道:

> Is it possible to have NEXT greater than FEXT.??
>  
> 
> For example: For a two trace microstrip system my
> simulator reports 10%
> NEXT (so for a 2.5V signal that translates to
> 250mV).
> 
> Based on the reported mutuals and self numbers and
> using the formula in
> Eric's book I estimate 60mV for FEXT.
> 
>  
> 
> Is this reasonable?
> 
>  
> 
> Best Regards
> Charles Grasso
> Senior Compliance Engineer
> Echostar Communications Corp.
> Tel: 303-706-5467
> Fax: 303-799-6222
> Cell: 303-204-2974
> Pager/Short Message: 3032042974@xxxxxxxx
> Email: charles.grasso@xxxxxxxxxxxx;
> Email Alternate: chasgrasso@xxxxxxxx
> 
>  
> 
> 
>
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