[SI-LIST] Re: Signal Routing in outer layer
- From: Zhangkun <zhang_kun@xxxxxxxxxx>
- To: bijesh.t@xxxxxxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Tue, 19 Oct 2004 19:07:58 +0800
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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