[SI-LIST] Re: Plane breaks - Diff pair crossing

Someone pointed out that we usually try to make Z11 close to 50ohm rather than 
25ohm. I 
agree. I mixed up Z11 with common-mode impedance in a differential pair where 
the two 50-
ohm lines are in parallel.

Hassan.


On Jan 24, "Hassan O. Ali" <hassan@xxxxxxxx> wrote:
> 
> Zdiff = 2*(Z11-Z12)
> 
> where Z11 is the self impedance of each trace, and Z12 is some impedance 
> related to 
the 
> coupling of the two traces. Now, assume, before the plane split, Z11 is close 
> to 25ohm 
> (as we normally make it), and Zdiff is close to 100ohm (as we normally make 
> it). 

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