[SI-LIST] Re: Different types of Critical Net Shilding
- From: "Goswami, Sumit" <sumit.goswami@xxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Wed, 17 Dec 2003 22:23:12 +0530
Hi Naresh,
The idea is to protect shielded net (victim net) from
the very next aggressor net. Now if you put VCC/VSS in between victim
and aggressor then that shield behave like a wall to protect strong
signal interference imposed by aggressor on victim. So if you put
VCC/VSS on both side of net then it is protected very well. Similarly if
you shield it in one side then net might be victimized from other side.
So in this case you won't gain some cross coupling capacitor on victim
net which will not change effective capacitance of the net.
In case 4 i.e. higher spacing will decrease harmful
interfering signal strength on victim net. But in this case you are not
able to avoid cross coupling cap fully. You will have some cross
coupling cap which will increase effective cap of net.
Does this answer your question.
Regards,
Sumit
=20
----- Original Message -----
From: "naresh vijay" <nareshv_63@xxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Sent: Tuesday, December 16, 2003 11:07 PM
Subject: [SI-LIST] Different types of Critical Net Shilding
> A Very Basic question?
>
> What is the diffrence between following three cases.
>
> 1. net shielded on both side by Ground(VSS)
>
> 2. net shielded on both sides by supply(VCC)
>
> 3. net shielded on one side by VCC and other side by
> VSS.
>
> 4. net not at all shielded but have wider spacing in
> its surrounding (equivalent to above cases in width
> perspective).
>
> and how these cases affect the efective resistance and
> capacitance values of the net.
>
> expert response to these questions are highly
> appriciated.
>
> Thanks in advance.
> Naresh
>
> =3D=3D=3D=3D=3D
> Naresh K. Vijay
> Sr. Design Engineer
> naresh.k.vijay@xxxxxxxxx
>
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.org
List archives are viewable at: =20
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
=20
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.org
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
