[SI-LIST] Re: Spacing rules for reduction of cross talk

Hi kedar,

The amount of cross-talk will be determined by the physical geometry =
that  signal  parallel to each others, the length of coupling,=20
signal rising time as well as the amplitude of  signal.=20

The width of signal will affect the amplitude of signal traveling on the =
trace.=20
Therefore; yes, the width will affect the amount of cross talk.

Thanks,
John
Quanta Computer Inc.

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On Behalf Of Vijay S CHACHRA
Sent: Thursday, January 06, 2005 4:01 PM
To: kedar@xxxxxxxxxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Spacing rules for reduction of cross talk

Hello All,
 The effect of cross-talk comes into picture when there is signal =
interference between adjacent signal traces on the board.
So while calculating cross-talk the board designer should be more =3D =
concerned abt distance between adjacent pcb tracks (and not the track =
=3D width)especially the traces adjacent to high speed signal traces.

Hope this resolves the doubt.

Thanks and Regards,
Vijay.C
Product Engineer,Serial Link Ips.
CRnD,STMicroelectronics(Noida).
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
=3D On Behalf Of Kedar P. Apte
Sent: Thursday, January 06, 2005 1:18 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Spacing rules for reduction of cross talk


Hi All,
some rules of route to route spacing are mostly followed by high speed =
=3D board designers as=3D20 w, 2w, 3w where w is actual trace width and =
the spacing reduces for syncronous signals=3D20 as like for data lines =
and address line the spacing will be kept equal =3D to the trace width  =
=3D3D w and for other async. signals it goes on =3D increasing by 2w and =
3w rule=3D20

but in the calculation of the cross talk trace width is not =
considered=3D20 why is it so..........?

please explain

thanks in advance

rgds
kedar
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