byang
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To verify whether it is Trapezoidal ringing, there is one thing one can check. One can plot the waveform in "point" style. The waveform needs to look like : * * * * * i.e. up and down and no point in between. This is numerical artifact.
Since the waveform looks "smooth", maybe it is not Trap ringing.
Gear2 method has numerical damping while Trap method has no numerical damping. Gear2 may dampen small oscillation even if it is real.
Baolin Yang Gemini Design Technology, Inc.
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