FreeLists / si-list / [SI-LIST] Spice

[Ivor Bowden <ivor@xxxxxxxxxxx>]

Hi SI Experts,

I have finally decided to get to know Spice, after many years of circuit 
design work, mostly digital. To this end I downloaded the SIMetrix Intro 
v5.0f program, and also acquired a copy of PSPICE 9.1 Student Version. I 
have only worked with SIMetrix so far.

I realize this is probably not the place to ask newbie questions about 
basic SPICE operations, so my first question is, can anyone suggest any 
good resources (url, list server, news group, etc) to find useful 
information and / or ask these types of questions? Web search finds 
overwhelming hits to pick through, specific recommendations are appreciated.

That being asked, my next question is what is the appropriate way to 
model a coax cable or a PCB trace, driven by a pulse? I set up a pulse 
voltage source (which I assume to be "perfect", that is no source 
impedance), a 50 ohm series resistance to represent the source 
impedance, a 50 transmission line grounded on both sides of one 
conductor, and a 50 ohm resistor to ground at the end. But the resulting 
waveform was not exactly what I expected..

Thanks for any comments,

Ivor
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