(a) Let the circuit of Fig. P7.4 have a 5 150 V/V, R1 5 10 kV, R2 5 20 kV, R3 5 30 kV, and R4 5 35 kV. Find vo and v if vi 5 0.2 V. (b) Change the value of R4 so as to make the actual closed-loop gain...

(a) Let the circuit of Fig. P7.4 have a 5 150 V/V, R1 5 10 kV, R2 5 20 kV, R3 5 30 kV, and R4 5 35 kV. Find vo and v if vi 5 0.2 V. (b) Change the value of R4 so as to make the actual closed-loop gain equal in value to Aideal. If vi 5 0.2 V, what is the new value of v? (c) Estimate vo and v if a drops to 60% of its nominal value.