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measurements circuits for folded cascade opamp

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A.jafari

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measurement circuits for folded cascade opamp

Hi.
I designed a folded cascade Opamp in the Hspice software and achieve these parameters:
Gain= 87 db----Phase margin=100',....
but I think that the amount of phase margin is not true so does anybody can help me?
Does anybody have a circuit that shows me how folded cascade must get simulation in Hspice software?
Thanks
 

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