Ken Kundert
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In DC analysis, the waveforms are assumed to be constant. A transition function cannot smooth a DC solution any smoother than it already is, because for the purpose of the analysis, the waveform is not changing. In other words, when a source voltage changes in a DC analysis, the analysis effectively waits forever for any transients to disperse, and then the analysis computes the result.
Thus, the transition function has absolutely no effect in DC analysis, except for the fact that it may not pass AC small signals.
In transient the argument to the transition function should be a piecewise constant waveform. The output will be continuous and piecewise linear.
In DC analysis, all waveforms are constant.
-Ken
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