In the circuit of Fig. P4.39 let VCC 5 2VEE 5 5 V, RC1 5 RC2 5 5 kV, IEE 5 1 mA, and REE 5 `. (a) Assuming negligible base currents, use the 18-mV and 60-mV rules of thumb to predict iC1, iC2, vO1,...

In the circuit of Fig. P4.39 let VCC 5 2VEE 5 5 V, RC1 5 RC2 5 5 kV, IEE 5 1 mA, and REE 5 `. (a) Assuming negligible base currents, use the 18-mV and 60-mV rules of thumb to predict iC1, iC2, vO1, vO2, and vOD for the following input voltage combinations: (vI1, vI2) 5 (0 V, 0 V), (0.25 V, 0.25 V), (21.0 V, 21.0 V), (18 mV, 0 V), (6 mV, 230 mV), (46 mV, 100 mV), (240 mV, 2100 mV), (212 mV, 30 mV), (0.12 V, 0 V), and (20.5 V, 20.2 V). (b) If VE0 denotes the voltage at the emitters when vI1 5 vI2 5 0, fi nd the value of vI1 that will cause the voltage at the emitters to raise to VE0 1 18 mV. What is the corresponding value of vOD? (c) Assuming ro 5 `, estimate vod if vid 5 (5 mV) cos t.