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Folded Cascode OTA Design - Help

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ashwin87

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Hi,

I am currently designing a folded cascode amplifier. I have designed the cascode transistors with Vov = 100mV. Vdd = 2.5 V. Vinput common mode = 1.25

i simulated the DC transfer curve for Vicm = 0 to 2.5. I got all the transistor in saturation from 1 to 1.8 V (constant slope). When when I simulated for output swing, upon giving differential input signals, my cascode leg transistors go into triode region. range of differential input voltage give is from +- 0.05

Please help me look at the direction to solve this problem.

Thanks
Ashwin
 

If ur ota is fully differential, u need to have CMFB to keep the transistors happy.
post it testbench, schematic to see if u might have other problems.
 

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