how to measure the output resistance of LDO?

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renwl

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Normally,we need very low output resistance of LDO. I want to know how to measure the output resistance of LDO.

thanks
 

one easy way is that after biasing your LDO, put a AC current source at the output of LDO, measure the AC voltage you get.

Make sure your loop is closed if you want to get closed-loop Ro. Or you just break the loop and get open-loop impedance.
 

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