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How to design such an OPAMP?

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winsonpku

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The opamp is used as a tran-impedance buffer.
The process is SMIC 90nm I/O 3.3V Transistor(L>0.38u)

DC Gain>80dB
Unity Gain Bandwidth>600MHz
Load=250||20pF
Phase Margin>60

Who can helpe me and any advice or paper is welcome!
Thanks!
 

maybe this can be of help
 

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