8.19 For the base-current-compensated mirror of Fig. 8.11, let the three transistors be matched and specified to have a collector current of 1 mA at VBE = 0.7 V. For IREF of 100 µA and assuming β = 100, what will the voltage at node x be? If IREF is increased to 1 mA, what is the change in VX? What is the value of IO obtained with VO = VX in both cases? Give the percentage difference between the actual and ideal value of IO in each case. What is the lowest voltage at the output for which proper current-source operation is maintained?
1.187 V; 0.113 V; 99.98 μA; 0.9998 mA, −0.02%; 0.3 V