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Big question in folded cascode with CMFB ?

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wael_wael

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Hi everybody
i am new in this area and my back ground in communication, so i am not expert in IC design.
now i have problems with this circuit
https://img45.imageshack.us/my.php?image=untitled6aa.png
could any one help me to find the
VB1--VB2--Size of M15--M16
and for CMFB which one optimum choice for pipADC?
continuous time one or swich capacitor one.
Best regards
my.php
 

i hop one of you can help me
thanx
 

Hi,

As for the choice of VB2, VB2 = Vov_M10 + Vgs_M12 = Vov_M10 + Vov_M12 + Vth

If M10, M12 have the same length, they would have the same Vth.

VB1 depends on the current flowing through M6, Vov_M6, Vov_M4, Vth_M6. I guess you just need to play with the equation of current in saturation region, then you can find VB1.
 

    W

    wael_wael

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ok thanks
what about the size of m15 M16
 

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