[Qucs-devel] Re: ASCO

[Stefan J. <st...@gr...>]

On Fr, 25.11.2005, 09:06, asco developer wrote:

Hello!

> On 11/25/05, Stefan Jahn <st...@gr...> wrote:
> ...
>> All this is in fact possible with Qucs.
>>   1) with transient analysis
>>   2) with an option of the analysis to output operating points
>>   3) this is a new feature in cvs
>>   4) what else?
>
> OK, Qucs team have been working hard! So this might be possible
> starting from version Qucs 0.0.8 but first I need to take a look. If
> you have a _coherent_ extraction language, then scaling up is not a
> problem for Qucs. I have to say that I'm influenced by commercial
> simulators and if some of then are quite good, others are nightmares.
>
> The next step for Qucs is to allow this on any type of simulation (AC,
> Harmonic balance,...) and as an added feature, make possible to
> algebraically manipulate the measurements between them.

This is possible as well using the equations.

> I have one suggestion that you might find useful. Sometimes to
> characterize a circuit it is necessary to: a) test it in AC, TRAN,...
> b) change a little bit the circuit before each analysis by connecting
> and disconnecting some branches, and c) measure electrical values. Not
> all circuit simulators support this but if you can do this, it might
> turn out to be useful.

You mean a simulation dependent circuit topology?

> Still on usability, in integrated circuit simulators it is of the
> utmost importance to allow the designer to see the operating point  of
> the devices, namely the transistors (Vgs, Cgs, gm, ...). Furthermore,
> by having access the their models, the simulator itself can better
> find and display their operating point in the output file.

As I told you this is optionally possible with Qucs.

> --- - ---
> Concerning your comment on mixing GPL code with the DE, below follows
> the author's answer.
>
>> I have no problem whatsoever if you use DE as you told
>> in your code. DE is made for public use, and you may
>> even use it commercially.
>
> In GAUL project, he even re-licensed the code in GPL after adding his
> own changes. So this might even be possible but I'm do not know the
> implications. What do you think?

Can you ask him to re-licensed the existing code to GPL?  Otherwise
part of your ASCO code is GPL and part of it can be used commercially
without publishing changes to it...

Cheers, Stefan.