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thank nitishn5.
I simulate loop gain and phase of LDO.PM is about 81 degree (pic 1).
And for Error amplifier,PM is about 76 degree.(pic 2).
I think PM is sufficient for stability.
My error opamp circuit used classical two stage op amp. I use 0.6 um library. It's difficult for me to increase...
i'm a newbie and i'm designing LDO with Vin=3.5 V and Vout=3.1 V. I have a problem that when i simulate with Vin increase from 0V to 3.5V.
If Vin increase from 0 to 3.5V in 5ms, vout is stably about 3.1 V.It's ok.(pic1).
But if Vin increase from 0 to 3.5V in shorter range of time, about 500us...
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