Xpander VCF

[jh.]

> Ok, of course you can, but you have to be very carefull.  I should have
> chosen other words, I should have said that the "results" for instable
> circuits should be crtitically observed. The "solution" might be totally
> wrong, may have nothing to do with reality. It depends on the actual
> mechanics of the integration process.

Yes. The only thing I would *fairly* trust is when you see how a
proven, stable system slowly starts to oscillate.
No good to determine stable / unstable in the first place.

BTW:
If you think circuit simulation is bad, try finite element stuff and such !
*That* is bad in terms of false "solutions" !


> In fact, spice simulation is not accepted to proove anything here ;->
>
> Too often too wrong.

Sure. Only trust it if you already know the theoretical solution
very well, and just use the numerical method for tedious what-if
checks.

JH.