about the loop stability problem in the li-battery charger

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huashizng

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i am designing a Li-ion battery charger. i am confused for the loop stability problem. how do we deal with the Li-battery in the AC analysis? how should we build AC model for the Li-battery?

thanks a lot in advance.
 

Use STB analysis in spectre.
 

voltage source with a small resistor in serial, I guess.
 

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