D 13.41 Consider the circuit of Fig. 13.14 for the case designed in Exercise 13.14, namely, I = 10 µA, IS2/IS1 = 2, R2 = 1.73 kΩ, R3 = R4 = 20 kΩ. We must generate constant currents of 10 µA and 40 µA in Q5 and Q6, respectively. What should the emitter areas of Q5 and Q6 be relative to that of Q1 with R5 = R6 = 0? What value of a resistance R6 will, when connected in the emitter of Q6, reduce the current generated by Q6 to 10 µA? Assuming that the VBIAS1 line has a low incremental resistance to ground, find the output resistance of current source Q5 and of current source Q6 with R6 connected. Ignore base currents