leejooseong222
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thank you for reply
actually i made voltage regulator for low supply application (under 0.5v)
so i employed 4 TR error amp (pseudo amplifier, 5 TR basic single ended amp without tail current)
all TR operates in sub treshold so WL sizes are very big ( tens um range)
the error amp has very poor CMRR, but when i did monte carlo simulation, the maximum offset was under 5 mV (offset = reference voltage - output volatge)
loop performance : DC gain is higher than 20 db, PM is larger than 50 deg.
i think these are enough performances for my application, but measured results were not good.
now i debug, the poor CMRR would make the problem... the simulation could not catch the common mode issues(common mode positive feedback...etc..)
what eles can i think or simulate?....
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