Be very careful about ground pour. If you end up with a significant length of "ground" that's not well-connected, it can cause trouble. -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Yuming Tao Sent: Thursday, February 23, 2006 8:58 AM To: Pradeep.RSA@xxxxxxxxxxxx; si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Re: Ground Pour in Signal Layers Hi, Pradeep My point of view, Ground pour on the signal layers (especially = intra-layer) is not useful unless you intend to create a grounded shield = signal channel for special signal routing, eg. high-speed signals then = ground via-array is required to connect GND plane vertically. This will = take lot of routing area. If you are looking for isolation, adding = ground between signal traces won't help since the spacing is a = dominator. if you are routing high-speed signal traces on top/bottom layers, you = may think using ground pour to create coplanar waveguide (CPW) for high = signal quality.=20 Regards, Yuming =20 -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Pradeep RSA Sent: Thursday, February 23, 2006 3:04 AM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Ground Pour in Signal Layers Hi, does a Ground Pour in the Signal layers in a multilayer PCB (with=20 sufficient internal ground planes) really helps? =20 Thanks in advance Pradeep ------------------------------------------------------------------ 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 FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ 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 FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ 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 ------------------------------------------------------------------ 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 FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ 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