ken_cn said:Yes.
THe bandgap and amp is at the correct operating point.
Then minus voltage is because of the Loading current source which is connecting to the output of the pass element directly.
ken_cn said:Thanks all.
Could you tell me what is the "Middlebrook method"? And how to simulate in spectre.
ken_cn said:Hi rajanarender_suram & paley.
Could you tell me why a small size pass element can cause this result?
My pass element's size is 100u/0.5u by 80 to handle 50mA load current. And the dropout voltage is 100mV at 50mA. I think it is large enough.
B.R.
Ken
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