FreeLists / si-list / [SI-LIST] Re: Help...

[James_R_Jones@xxxxxxxx]

I might recommend:

----------------------- GND
5 mils
     --    --           Signal

15 mils

     --    --           Signal
5 mils
----------------------- Power or GND

or something of that ilk.

This way, the majority of any reference plane coupling will go to the
nearest plane and not crosstalk. You could also route the traces
orthogonally in order to further reduce coupling.  Also, tightly coupled
traces will crosstalk even less, but be wary of losses due to fringing
effects.

"Will the trace impedance of one layer get affected if one more routing 
layer comes in between it and ground? How to reduce crosstalk and EMI in 
this case?"

If you follow above suggestion, impedance will not be significantly
affected.  Trace crosstalk can be reduced to almost nill using orthogonal
routing, and EMI should pose a problem due to buried traces (striplines).

Hope this helps,
James R. Jones
Dell


-----Original Message-----
From: Manjusha [mailto:manjusha@xxxxxxxxxxx]
Sent: Friday, February 07, 2003 1:30 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Help...



        
Hi,
    Need help on LVDS  Routing. If I use two adjacent layers for signal 
routing,what should be layer thickness, trace width,trace spacing etc. This 
is not about broadside coupled signals , but about edge coupled striplines 
on  adjacent routing layers.
Will the trace impedance of one layer get affected if one more routing 
layer comes in between it and ground? How to reduce crosstalk and EMI in 
this case?

Thanks in advance,
Manjusha.

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