Answer Happy

*4.26. The common-emitter output characteristics for an npn transistor are given in Fig. P4.26. What are the values of BF at (a) Ic = 5 mA and VCE = 5 V? (b) 7.5 V? (c) Ic = 10 mA and VCE = 14 V? (d) Ic = 7 mA and VCE = IB 100 μA and VCE = 10 V? (e) IB = 40 µA and Vce = 5 V? 10 mA IB 100 μα IB = 80 μA IB = 60 μA IB = 40 μα IB = 20 μA O Collector current 5 mA 0 A OV Figure P4.26 5 V VCE 10 V 15 V

*4.99. Find the Q-point for the circuit in approach. Use the characteristics in of ic vs. VEC rather than ic vs. VCE. 3.6 ΚΩ 6.8 ΚΩ Figure P4.99 www Fig. P4.99 using the graphical load-line Fig. P4.26, assuming that the graph is a plot +10 V 330 Ω 420 Ω