The figure below shows a folded cascode CMOS amplifier with Q₂ supplying 21.The transistors Q4 and Qs are cascaded current source supplying a current I. All transistors have equal gm and ro. Find the expressions for the indicated resistances (R1, R2, Rin3, R03, Ro4, Ros and Ro). Find the voltage gain vo/vi (gm=2mA/V) and A。 = 30.