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Two-Stage Op Amp Ideal Vref Help

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I would like to have an Ideal Vref of 2.5V
However I would like to know if the values for the  test bench that I made is right 

For the maestro, my expressions are:

The figure below is my Two Stage Op Amp

PMOS W=8u L=400n , for first stage m=4 & 8 , 2nd stage m=10

NMOS W=3u L=400n, first stage m= 4 & 8 , 2nd stage m=9

Iref = 72u

*The RC and the CC values are not yet final*

I would very much appreciate if someone will guide me 


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