From: roucaries bastien <roucaries.bastien+<qucs@gm...>  20130906 16:55:48

On Fri, Sep 6, 2013 at 11:37 AM, Soeren D. Schulze <soeren.d.schulze@...> wrote: > Hi everyone, > > as described before, I'm currently refactoring Qucs' transient solver > into an updatebased scheme in order to overcome difficulties with small > step sizes and (therefore) badlyconditioned Jacobians (see the branch > "numerical_improvements"). I'm almost done; only the > "transientCapacitance*" functions still need to be ported. > > From reading the source code, this is how _I understand_ them. > > * "transientCapacitance" computes a nonlinear capacitance Q=f(V), where > V is the voltage across the capacitor plates. > > * "transientCapacitanceC" computes a linear capacitance Q=C*V, where V > may be a voltage somewhere else in the circuit. > > * "transientCapacitanceQ" computes Q=f(t), i.e., a charge that doesn't > depend on any voltage. > > * In Veriloggenerated code, the latter two are used together in order > to model a general nonlinear capacitance Q=f(V), where V may, again, be > anywhere in the circuit. > > Is this correct? > > "transientCapacitance" and "transientCapacitanceQ" currently use a > "qstate" to save the charge; in order to port them, I'm going to turn > this into a state variable in the x vector (if we eventually use a > sparsematrix representation, this won't be a speed issue at all). > > Does anyone have an insight in the Veriloggenerated components? I'm > not sure how to test my changes. i second here. i want to port to recent inverter admsxml and I wish if it is possible to get some use case with abort/assert in order to test regression during porting > > > Sören > >  > Learn the latestVisual Studio 2012, SharePoint 2013, SQL 2012, more! > Discover the easy way to master current and previous Microsoft technologies > and advance your career. Get an incredible 1,500+ hours of stepbystep > tutorial videos with LearnDevNow. Subscribe today and save! > http://pubads.g.doubleclick.net/gampad/clk?id=58041391&iu=/4140/ostg.clktrk > _______________________________________________ > Qucsdevel mailing list > Qucsdevel@... > https://lists.sourceforge.net/lists/listinfo/qucsdevel 