Hi Dave, Normally this would fall into the classification of a dual stripline, but if he/she is only interested in impedance between the Plane and the one signal layer, I don't see why this would not be valid. I believe I would handle it as an unbalanced stripline and just Ignore the other signal layer. Regards, Les > From: David Curtis <[log in to unmask]>, on 1/6/99 11:31 AM: > Hi there, > > Can anyone comment on the validity of a stripline Zo calculation when > the layer in question resides between a plane and another signal layer > and then a plane, instead of between two planes? The intent of the > designer was to ignore the adjacent signal layer. Fab guys: is this > acceptable when you have to meet a certain spec? > > Thanks, > > Dave > > ################################################################ > TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c > ################################################################ > To subscribe/unsubscribe, send a message to [log in to unmask] with following > text in the body: > To subscribe: SUBSCRIBE TechNet <your full name> > To unsubscribe: SIGNOFF TechNet > ################################################################ > Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section > for additional information. > For technical support contact Hugo Scaramuzza at [log in to unmask] or > 847-509-9700 ext.312 > ################################################################ > > ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################