Folded cascode Opamp current distribution problem

[kamrulalam]

I have Designed Folded cascode Opamp. At open loop configuration But i can not understand how the total current will be distributed through the cascode part and Nmos diff_pair?lets say total current 45uA where as Ibias current 30uA.
I draw a attention from Analog design expertise to give me the solution.
Advance thanks.

 

[frankrose]

Could you post your schematic? We don't know what you call Ibias, the tail current or the lower/upper current sources of the OpAmp, not only one folded-cascode structure is possible I think. I don't know either what you call "open loop configuration".