(a) Suppose the input stage of is redesigned by dropping Q1 and Q2 and by operating Q3 and Q4 as an EC pair biased at IEE 5 19 A. Show the modifi ed circuit and use the device parameters of the text,...

(a) Suppose the input stage of is redesigned by dropping Q1 and Q2 and by operating Q3 and Q4 as an EC pair biased at IEE 5 19 A. Show the modifi ed circuit and use the device parameters of the text, along with F4 5 50, to recalculate IP, IN, Rid, Gm1, Ro1, and the unloaded gain vo1(oc)y(vp 2 vn). (b) Assuming the B-E junctions of the pnp BJTs break down at 7 V and those of the npn BJTs break down at 20 V, what is the maximum voltage difference (vP 2 vN)max that can safely be applied to the modified circuit of (a) before breakdown occurs? (c) Compare all the above parameters with those of the original 741 design, and give reasons why the original design is generally preferable.