Hi! I had looked up the past archives on this subject pertaining to the definition of differential pairs. I had additional questions as to 1)if I am extracting the RLGC for a diff pair do I apply the stimulus to one node only. And if YES then shouldn't I excite both the nodes differentially i.e. positive going to one node and inverting to the other. 2)Also when defining the stimulus does the stimulus have to represent the source of the frequency of interest i.e. the RLGC will be extracted based on the pulse source. e.g. at 2.5GHz the pulse source is (3.3 0 100ps 50p 50p 150p 400p) 3)When defining the model statement for the broadside coupled pair + CONDUCTOR = ( MATERIAL=copper, SHAPE=rect, ORIGIN=(0, 7.2mil) ) + CONDUCTOR = ( MATERIAL=copper, SHAPE=rect, ORIGIN=(17mil, 7.2mil i.e. the traces are 6mil above the gnd plane and are separated by 11mil & are 1.2mil thick. Is this correct? Thanks in advance. Bob __________________________________________________ Do You Yahoo!? Yahoo! - Official partner of 2002 FIFA World Cup http://fifaworldcup.yahoo.com ------------------------------------------------------------------ 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: http://www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: http://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