Re: [ng-spice] u2 function


To ng-spice@ieee.ing.uniroma1.it
From widlok <widlok@uci.agh.edu.pl>
Date Thu, 04 May 2000 15:23:23 +0200
Delivered-To mailing list ng-spice@ieee.ing.uniroma1.it
Mailing-List contact ng-spice-help@ieee.ing.uniroma1.it; run by ezmlm
References <Pine.LNX.3.96.1000502162412.3837A-100000@ieee.ing.uniroma1.it >
Reply-To ng-spice@ieee.ing.uniroma1.it



Paolo Nenzi wrote:

> Oops, I have understood that your model was different from IF-THEN-ELSE
> condition. Your function is a class C0 function, continuous but with first
> and subsequent derivatives not continuos, this may cause convergence
> problems.

>
> Another point, do you believe that this function is a step for your
> circuit ? Some fast circuit may see it as a ramp, am I right or I am only
> a sophisticated theorethical EE student ?
>
> Paolo

    You are right. This is different for different circuits, but You can 
always use
u2(K*x). Changing K change its behavior. Convergence with u2 is much better 
then
with u (at least with my model), so I think that it is useful in IF-THEN
expressions.

Michael

PS. What is with help command?


Partial thread listing: