[SI-LIST] Re: doubt about crosstalk.
- From: "Ibrahim Khan" <ikhan@xxxxxxxxxxxxxxxxxxx>
- To: <yunnan@xxxxxxxxxx>,<si-list@xxxxxxxxxxxxx <si-list@xxxxxxxxxxxxx>,<si-list@xxxxxxxxxxxx>
- Date: Tue, 23 Jul 2002 07:26:24 -0500
Yun,
In my opinion the guard trace makes a good bandpass filter. If you have
space to put guard trace, the best thing will be not to put any guard
trace and give more spacing to avoid cross talk. Let us see what other
experts say.
Ibrahim
-----Original Message-----
From: yun [mailto:yunnan@xxxxxxxxxx]=20
Sent: Tuesday, July 23, 2002 2:57 AM
To: si-list@xxxxxxxxxxxxx <si-list@xxxxxxxxxxxxx>; si-list@xxxxxxxxxxxxx
<si-list@xxxxxxxxxxxxx>; si-list@xxxxxxxxxxxx
Subject: [SI-LIST] doubt about crosstalk.
Hi,
I encounted some doubt about crosstalk,hope someone can help me. 1.about
ground guard line.
To reduce long coplanar parellel's crosstalk,we can place a ground
guard line between them. On my opinion,however,the ground guard line can
only terminate the electric filed,it has no influnce on magnetic
filed.As we know,the forward crosstalk nearly canceled because the
negative polarity of electric filed couple and magnetic filed couple.So,
the forward crosstalk will be larger when use=20
the ground guard line than not use the ground guard line. 2.back to back
return current crosstalk.
The pcb layer configuration is sig1-gnd-sig2(just for describe
question),then,both sig1 and sig2 layer's return currents will all on
the same gnd layer.We know that the return currents will creat crosstalk
on signal lines.So,will these return currents,created by each side of
gnd layer,crosstalk? Thanks. yun
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