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Ansoft Designer / Ansys Designer 在线帮助文档：

Nexxim Simulator >
Nexxim DC Analysis >
   Convergence, Speed, and Accuracy >
       Options that Affect Convergence, Speed, and Accuracy >
           Relative Voltage and Current Tolerance               

Relative Voltage and Current Tolerance

The reltol option controls the relative tolerance used for both the delta voltage check and the current function check (see “Convergence Criteria” above). The default reltol is 0.001 (0.1%).

Both the delta check and the function check have two parts, a relative part and an absolute part. The relative part is a function of reltol and some reference value, typically calculated voltage or current. When the reference values are large, the relative part of the criterion is much larger than the absolute part, and reltol in effect controls the convergence. In these cases, making reltol larger (“loosening reltol”) allows the circuit to converge in fewer iterations (and shorter simulation time), but with reduced accuracy.

Conversely, decreasing (or “tightening”) reltol increases the accuracy of the result, but may require more Newton-Raphson iterations to reach convergence. Thus, if reltol is tightened, the max_newton_iterations option may need to be increased.

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