The following circuit shows a folded-cascode CMOS amplifier utilizing a current source Q2 that supplies a current of 2�I. A cascoded current-source (Q4, Q5) provides a current I

The following circuit shows a folded-cascode CMOS amplifier utilizing a current source Q2 that supplies a current of 2�I. A cascoded current-source (Q4, Q5) provides a current I. Assume that all transistors have equal parameters gm and ro.

a) Give approximate expressions for all the resistances labeled.

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b) Find the amplifier output resistance Ro.

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c) Show that the short-circuit transconductance Gm is approximately gm1(= gm).

d) Find the overall voltage gain vo/vi and evaluate its value for the case of gm1= 2 mA/V and A0= ro�gm= 20

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