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Folded Cascode single ended output design problem

Zakir Alam
Prodigy 10 points

Hello,

Now I am designing single ended folded cascode amplifier in 0.13um technology. Supply voltage 1.2V. Input is NMOS. I am using 4 stack 2 branch cascode.  upper 2 stacks are PMOS and lower is NMOS. My problem is gain is not increasing and unity gain bandwidth is very low. currently gain is 33dB and unity BW is 35MHz. Though I try to increase power but BW is not increasing. Any body gives some hints about that problem will be helpful for me.

Thanks