Transient simulation: which method is best for circuits involving undamped (or slightly damped) oscillations?
The trapezoidal method should be used in these cases because the other methods (Backward Euler or Gear2) introduce some artificial damping. Examples of slightly damped oscillations: RLC circuits, free acceleration of induction motor. Note that there are many oscillatory problems in which the oscillations are “forced” and are not affected by damping. For example, a MOS ring oscillator, a Wien bridge oscillator, a 555 timer oscillator, a Schmitt trigger oscillator, etc. In these circuits, the “energy” of the oscillations is provided by a DC voltage source, and the results would not depend significantly on the method used for transient simulation. • How does one select the method parameters? A detailed description of the various method parameters is given in the manual. For a quick start, it is best to find a “similar” example (in terms of elements and time scales), and copy/paste the solve blocks from there. It is likely that the parameters used there would work well for the new project
