Code Option Name Description Default Unit Recommendation
ITL1 DC iteration limit Sets the Newton-Raphson iteration limit that is used for DC analysis. 100 — If getting non-convergence in DC (error message "No convergence in DC analysis"), increase the ITL1 value to 500 or 1000 and rerun the analysis.
ITL2 DC Sweep iteration limit Sets the Newton-Raphson iterations limit for each of the DC analyses in a DC sweep analysis. 50 — Increase if getting non-convergence in a DC sweep analysis.
ITL6 Steps in source stepping algorithm

Sets the number of steps in the Static Source Stepping algorithm. The value only has an effect only if the DYNAMICDC option is not ON.

The Static Source Stepping algorithm helps find a solution during a DC operating point analysis.

Refer to the DC Convergence Assistance Algorithms section for more information.

 10 — If not running in Dynamic DC mode, and if getting non-convergence in DC analysis, increase this value if increasing ITL1 option does not help.
GMINSTEPS Number of Gmin steps

Sets the number of steps in the Static Diagonal GMIN stepping algorithm. The value only has an effect only if the DYNAMICDC option is not ON.

The Static Diagonal GMIN Stepping algorithm helps find a solution during a DC operating point analysis.

Refer to the DC Convergence Assistance Algorithms section for more information.

 10 — If not running in Dynamic DC mode, and if getting non-convergence in DC analysis, increase this value if increasing ITL1 option does not help.
DYNAMICDCFACTOR Dynamic DC Factor

Sets the initial and upper bound factor value by which the DC sources and Diagonal GMIN values are modified during the Dynamic DC Stepping algorithms. Note that this value only has an effect if the DYNAMICDC option is ON.

The Dynamic Source and Diagonal GMIN Stepping algorithms help find a solution during a DC operating point analysis.

Refer to the DC Convergence Assistance Algorithms section for more information.

 10 — If running in Dynamic DC mode and getting non-convergence in DC, increase this value to 50 or 100 if increasing ITL1 option does not help.
DYNAMICDC Dynamic DC Stepping Selects the Dynamic DC Stepping algorithms for convergence assistance if set to ON. Otherwise, Static DC Stepping algorithms are used. The Dynamic DC algorithms are generally more powerful than the Static ones. — —

Leave this option ON.

If increasing ITL1 or DYNAMICDCFACTOR does not help, you can try switching this option OFF.
NOOPITER Go directly to Gmin stepping If set, the basic DC algorithm will not be attempted, only the Static or Dynamic stepping algorithms will attempt to find the operating point. — — Leave this option OFF.