From: Bastien R. <rou...@gm...> - 2007-12-26 21:14:55
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Le mercredi 26 d=E9cembre 2007, Stefan Jahn a =E9crit=A0: > Am Di, 25.12.2007, 18:20, schrieb Clifford Wolf: > > Hey, > > Hello! > > > I've spend the whole day tring to do a transient simulation of a simple > > multi vibrator. > > Oscillators are sometimes difficult to simulate. > > > The simulation just hangs or returns bogus results with > > the > > normal transistor model. I've now tried with the the BC549 Model and set > > the initial voltage of one of the transistor bases to 0.8V, which > > looks already close to what I'd expected. > > > > But the simulation aborts after some time with the following error > > message: > > ... > > > > I have to admit that I don't know anything about the math behind this > > simulations, so I can't tell whats going on here. > > > > Depending on resistor and capacitor values this message pops up earlier > > or later. > > > > is there anything I can do about it? I also havent found anything in the > > qucs documentation about stuff like this (e.g. which Integration Method > > has > > what pros and cons, I'm just mentioning this topic because I got much > > worse > > results using the standard Integration Method and it is better since I > > switchd to 'Euler'). > > > > Is there any documentation on this topics? > > Unfortunately not. > > All of the transient simulation options may have effects on the > simulation behaviour. I just tried to change "relaxTSR" with your > example and then the simulation went through... In my school we teach in this case to put capacitor between CE or to put a= =20 small resistor in serie with capacitor./ What do you think about this kind = of=20 workarround? (Because it will smooth the tranfert function) BTW what is relaxTSR?. Regards Bastien > Cheers, Stefan. > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2005. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > Qucs-help mailing list > Quc...@li... > https://lists.sourceforge.net/lists/listinfo/qucs-help =2D-=20 "ROUCARIES Bastien" roucaries.bastien+qucs@gmail.= com =2D------------------------------------------------------------------------= =2D----- DO NOT WRITE TO rou...@gm... OR BE BLACKLISTED |