On Thu, Jan 05, 2006 at 08:13:23AM -0800, Larry Doolittle wrote: > Friends - > > On Thu, Jan 05, 2006 at 11:21:40AM +0100, Karel Kulhavy wrote: > > Would it be possible to enter material constants and layer ordering into > > the PCB and then make a function that would display resistance, > > inductance and capacitance of a track (alone or with reference to > > infinite groundplane at a different given layer)? You would define > > starting and ending point and it would calculate the line profile and > > lengths. > > > > It could work for line-only traces for the beginning. > > It would make HF design much easier. > > I'm this --> <-- close to making a stab at the line length > calculation. If anybody else has started, let me know so > we can share the work. What Karel asks for is probably too > much all at once, but we can work up to it. Walk before you > run, etc. > > Basically all I hope to do is find and sum the lengths > of each segment connecting two points. Possibly add an > angle-dependent correction factor for bends, and print > a warning if any non-45 degree bends show up. For now > I don't even need to handle vias -- the critical nets > that this would be used on most shouldn't use vias. :-p
Why? Via doesn't have much more inductance than a piece of trace, does it? CL< > > - Larry
