# The following circuit shows a folded-cascode CMOS amplifier utilizing a current source Q2 that suppl

The following circuit shows a folded-cascode CMOS amplifier utilizing a current source Q2 that supplies a current of 2A????1I. 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.

b) Find the amplifier output resistance Ro.

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Order Paper Nowc) 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= roA????1gm= 20

Show transcribed image text The following circuit shows a folded-cascode CMOS amplifier utilizing a current source Q2 that supplies a current of 2A?·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. b) Find the amplifier output resistance Ro. 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= roA?·gm= 20