NE-2 I-V Curve ??

You show lack of experience with simulators... ramping up the power supply from zero (and selecting "Skip Initial Bias Point Calculation"), solves almost every starting point convergence I've ever experienced. ...Jim Thompson

Probably, because you are not doing full chip simulations with 10k+ analog transisters :-)

Kevin Aylward

Oh? But I do. However most, if not all, of those monster chips use a POR. I was just offering up a suggestion for those experiencing convergence issues. ...Jim Thompson

Yep. TANH! But handles neon much better if you use current-controlled voltage source, rather than current-controlled current source (which will be just ducky for tunnel diode modeling).

Falling back on my math crutches (I use several :-) I show the preliminary results at...

Still need to parameterize the valley shape to suit all possibilities. ...Jim Thompson

I delete Notepad. I used Wordpad since Win 95, but if I have to move to Win 7 I'll have to find a different program. It won't let me edit & save files with a .htm or .html extension.

Try Notepad++ if you like that interface.

Cheers

Phil Hobbs

Crimson Editor is pretty good.