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Problem with designing OTA for LDO

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jutek

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OTA

hello

could you tell me what's happening.

I design an OTA for LDO and met this problem. When i do .OP and polarize inputs with a given voltage, everything is alright. I've got 100V/V gain and so on.

How to set AC properly to achieve the same results?
I simulate LDO with an open loop. negative input is grounded through small resistor and AC=1 signal is connected to positive one.

regards

luke
 

zhutou

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Re: OTA

I meet such quetion also!
I cann't solve it too.
 

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