Oscillation problem of LDO

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boranavi

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I have big problem with our LDO which can drive up to 300mA dual. I couldn't find out output oscillation on simulation, but it happened on silicon. anyone can give tips to work this out.
 

Maybe your phase margin is not enough. Because of process variation, the phase margin is changed in silicion. Try to change your load cap
 

What's your LDO structure? Maybe you can paste it here, then others can help you to find parasite pole.
What's poles and zeroes location? How many gain stage?
 

If the non-dominant pole is the output pole, try to reduce the load capacitance to the LDO. If not possible, you can add a resistor in parallel to the load cap. Both solutions will degrade the refulator's performance
 

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