Hi,
I am designing a circuit which is used in the portable handset. I want to do the powerup and powerdown analysis, I wonder what is the rampup and rampdwon time should I select in simulation?

Also, There is also an enable signal in my circuit, which is assumed from the other chip in the system, e.g., a MCU.Same as above, what should I select the rampup and rampdown time should I select to do the enable/disbale analysis?

Thanks