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Fully differential folded cascode

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kundahari

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hi friends, can anyone give me design procedure of fully diff folded cascode opamp structure?
any document plzz.. thanx
 

the best document is Razavi's analog CMOS design book.
The step by step is:
Define your DC gain, define your input referred noise: come up with gm and Rout you need.
Define your gain bandwidth: minimize the size of transistors at folding node to reduce the dominant pole (or increase the gm of cascodes).
 

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