Code Option Name Description Default Unit Recommendation
ITL4 Upper transient iteration limit Sets the Newton-Raphson iteration limit that is used for each transient time point. Increasing the value may slow down transient simulation time. Decreasing the value increases the chance of non-convergence. 100 — If you receive the error message "Time step too small" or "No convergence in transient analysis", increase the ITL4 re-run the analysis.
MAXORD Maximum integration order Sets the maximum order for integration when GEAR is chosen as the transient analysis integration method. Must be between 2 and 6. Using a higher order theoretically leads to more accurate results, but slows down simulation. 2 — Use the default value for most circuit simulations.
TRTOL Truncation error overestimation factor Sets transient error tolerance. Only used in the local truncation error criterion. 7 — Use default value.
METHOD Integration method Selects the numerical integration method that is used in transient analysis. TRAPEZOIDAL — The Trapezoidal method is generally faster and more accurate. However, this method is not as stable as the Gear method and can result in oscillations. Switch to the Gear method if you are experiencing undue oscillations.
SUPOSC Suppress numerical oscillations

When ON, the numerical oscillations that may result when using the Trapezoidal integration method are suppressed. Refer to the Numerical Oscillations section for more information.

This option will not have any affect when the Gear integration method is selected.

 On —

Leave this option ON.

If experiencing non-convergence in transient analysis, disable this option as a last resort..