[SI-LIST] Re: Signal Routing in outer layer

Dear Bijesh

To Q2
    1)    In HSPICE, the RLGC matrix could be gotten. Based on the matrix, the 
impedance of differential pair could be gotten.
            Z_diff=sqrt ( (L-M) / (C+2Cm) )
    2)    In ANSOFT software, similar method could be utilized.

Best Regards

Zhangkun
2004.10.19
----- Original Message ----- 
From: "bijesh.t.b" <bijesh.t@xxxxxxxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Sent: Tuesday, October 19, 2004 6:29 PM
Subject: [SI-LIST] Signal Routing in outer layer


> Hi all,
> I would like to get some clarification reg. the high speed differential  
> signal routing in multilayer board.
> 
> 1).Can we route  high speed differential signal in outer layer?.
> 2).If we can route the differential signal in outer layer then, how do we
> calculate the impedence.
> 3).What is the minimum tolereance which we can give for the outer layer
> impedece.
> 4).If the high speed differential signal can be routed in the outer layer
> then,how do we control the EMI issues?.
> 
> If anyone of you can help me on this,Please..
> 
> Thank you
> Bijesh
> 
> 
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