There are various techniques for defining rise time. Typically the time from 10% to 90% of the final value is used. Sometimes 20% to 80% is used.
Slew rate is typically in units of volts/second. Slew time is an odd term from my perspective.
But how can i understand the slew time defined in the .mod library? It is different from what I measured in simulation plot.
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Slew time specifies the 10%-90% switching time of the upper- or lower-stage transistor for the .MOD Model Parameters. The scope can measure it for you when you select the waveform and then press the 'fall slew rate' or 'rise slew rate' button on the lower part of the scope. I just ran some tests with unloaded .mode model and 300ps setting. I am seeing the 300ps, not 600ps. I am not sure what caused the 600ps result that you saw. If you chose a different model than you had expected you could have gotten a longer switching time, but I do not see one with 600ps slew time. If you contiinue to see this result with 300ps setting, please open a service request on supportnet.
Thank you and best regards,
I tried again. The measured raise/fall time still cannot match with the slew time. I will open a request on the supportnet.