My favorite go-to in this case is the Gear solver. I'm not in the same room with an LTSpice application, but AFAIK it uses a Runga-Kutta solver, which doesn't do well with stiff systems (Google "stiff system simulation" for details). First, look at your schematic and ask yourself if you've just asked a nonsensical question. So the time step gets small either when you're doing something that challenges the algorithm (like a stiff system), or when you're asking for too much (like the relative tolerance that spoke of. Nearly all such solvers adjust the time step dynamically, trying for the largest possible time step while maintaining accuracy. Simulators like this use numerical ordinary differential equation (ODE) solvers. Your simulation is, for some reason, too hard for the solver.
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