Consider the circuit of Fig. 11.30 in which Q1 and Q2 are

Chapter 11, Problem 11.38

(choose chapter or problem)

Consider the circuit of Fig. 11.30 in which Q1 and Q2 are matched, and Q3 and Q4 are matched but havethree times the junction area of the others. For VCC = 10 V, find values for resistors R1 through R4 which allow for a base current of at least 10 mA in Q3 and Q4 at vI = +5 V (when a load demands it) with at most a 2-to-1 variation in currents in Q1 and Q2, and a no-load quiescent current of 40 mA in Q3 and Q4; , and For input voltages around 0 V, estimate the output resistance of the overall follower driven by a source having zero resistance. For an input voltage of +1 V and a load resistance of 2 , what output voltage results? Q1 and Q2 have of 0.7 V at a current of 10 mA.