Geoffrey_Coram
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R.O. = ring oscillator? (best not to use abbreviations in your first post)
Do you have HVMOS gates? I guess the point with a ring oscillator is that there isn't an external source with an artificial transition -- eg, too fast a rise time on your pulse or PWL source. So, for HVMOS, you should probably put in "enough" gates that the rise and fall times are determined by the HVMOS devices rather than the input source.
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