Re: [Qucs-devel] Bug/logic oddity in Transient solver loop

[Andrew S. <wac...@go...>]

On 20/01/13 17:10, quc...@li... wrote:
>
> Hi Andrew,
>
> We are now building a new team to get Qucs back on the road, at least
> the activity has been boosted.
> A couple new people are working on it now (I am also new).
> I have to get a little more familiar with the way the simulator works, I
> have now concentrated on the Qt4 part.
> It seems like you know what you are talking about, why don't you join us?
>
> Frans
>

Hi Frans,

Sorry about the delay responding.  I've been laid out with an evil cold 
for a few days.
Joining the team sounds fun but with two young kids, a working partner 
and non-trivial day job I'm not sure I can make any commitments about 
any kind of sustained contributions.

I'm afraid I know only enough about Newton-Raphson solver based circuit 
simulation and numerical analysis to know that I don't know much at all 
;-).  I'm a  C++ EDA verification/synthesis tooling guy who ended up 
doing some time architecting SoC's more or less 'by accident'.

However, I would like to get a cosimulation interface up and running.

Regards,

     Andrew


PS
Whats the state of the MOSFET Models in Qucs?  Some quick tests with a 
circuit using a MOSFET to switch a diode-clamped inductive load produced 
some pretty weird behaviour.   I can't yet rule out a oops in my circuit 
- if I get a moment I'll try to cross-check both on SIMetrix - but it 
looked damn strange.

Trying the same MOSFET in a flyback converter model that produce 
beautiful "classical"  wave with ideal switches also behaved very 
strangely with a MOSFET replacing the switch.