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Calculate impedance in circuit of an OPAmp

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akbarza

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hi
in this figure, what is the seen impedance in x point by M4T mosfet?pl. explain how calculate the impedance at this point?
pay attention that M4T is in triode region.
do 4 bottom transistors have role in impedance?
what different is occurred if sources of vp and vm are dissconected?why this connection is used?
thanks
2.png
 

Boy, you didn’t even ATTEMPT to hide the fact that you’re asking us to do your homework. Take your F, and then go find another career.
 

i leave university three years ago, i found in a paper that i had written before to ask this.
i before sending this post i tried to solve it, but i couldn't. i posted this and i find this answer, i don't know what i must say.
 

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