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. ------------------------------------------------------------------ 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 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 ------------------------------------------------------------------ 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 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