FreeLists / si-list / [SI-LIST] Re: EMI Containment

[zhangkun 29902 <zhang_kun@xxxxxxxxxx>]

Karthik

What is stitch capacitor? Is it the common cera-capacitor?

Best Regards

Zhangkun
2004.8.8

----- Original Message -----
From: "Loganathan, Karthikeyan (GE Consumer & Industrial)" 
<karthikeyan.loganathan@xxxxxx>
Date: Sunday, August 8, 2004 10:02 pm
Subject: [SI-LIST] EMI Containment

> Hi All,
> 
> I found a high speed (operated upto 1Ghz), dense board design 
> total =
> 10layers, out of which only one 3.3V (layer2) Plane and One Gnd 
> Plane =
> (layer9). Other Power traces were routed individually.
> 
> To reduce the radiation, they have provided Stitch Capacitors =
> (decoupling) between layer 2 & 9, across the board. All the fast =
> switching signals were routed within these layers.
> 
> I am sure, Stitch capacitor technique reduces EMI, but my question 
> is, =
> what extent?.  Is any better method available?
> 
> As you know, the return current paths in the stackup said has wide =
> seperation between signal and reference planes,  also the stitch =
> capacitors (SMT) added will have inherent Lead Inductance and 
> overall =
> increases the board cost too.
> 
> Thanks,
> Karthik
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