folded cascode OTA design

[qslazio]

I'm going to design a two stage folded cascode OTA.
first stage is folded cascode(pmos input pair) to provide gain
second stage is common source to increase the output range
compensation is cascode compensation


My question is in my circuit, how to decide the input pair IDS and folded branch IDS.
Is there a design iteration flow for me to reference?


Thanks a lot!

 

[eng_Semi]

What I got from ur question is that u want to know how to assign the cuurents in both branches.

If this is true, so u have ti increase the current in the branch containing the input pair (to inc Gm) and to decrease the current in the other branch (folded branch) and this to inc the transistors ro.