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In essence the method of source stepping is equivalent to determining the DC
operating point with a DC transfer curve. All independent sources are not
directly applied to the circuit but damped with a value
which is
between zero and unity. After convergence for a distinct
is
obtained,
is increased by a factor depending on the iteration count
of the last solution until convergence is obtained. In case no convergence is
obtained within a distinct number of iterations,
is decreased until
convergence is obtained again. As pointed out in [43] this method
needs an excessively large number of iterations for conventional circuit
simulation. For good reasons, the same behavior can be expected for
mixed-mode simulation. The method can be improved by making use of a
predictor which calculates an initial-guess out of previous solutions
[43].

*Tibor Grasser *

1999-05-31