Folded Cascode Amplifier

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sarapearl2002

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Hi, I'm trying to design a fully differential folded cascode amplifier (2 nmos and 2pmos) with pmos input. could anybody suggest a bias circuit?
I've already designed a bias circuit but the nmos transistors are in triode region.
all the bias transistors are in saturation and the pmos transistors of the folded cascode stage are in saturation too.
 

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