6.69 All the transistors in the circuits of Fig. P6.69(a), (b), (c) are specified to have a minimum β of 50. Find approximate values for the collector voltages and calculate forced β for each of the transistors. (Hint)

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6.68 For the circuit in Fig. VE 6.4, find VB and VE for vI = 0 V, −2 V, +2.5 V, and +5 V. The BJTs have β =50. (a) –0 V, 0 V; (b) –1.8 V, –1.1 V; (c) +2.2 ...

D *6.67 Using β = ∞, design the circuit shown in Fig. P6.67 so that the emitter currents of Q1, Q2, and Q3 are 0.5 mA, 0.5 mA, and 1 mA, respectively, and V3 = 0, V5 = −2V, and ...

*6.66 For the circuit shown in Fig. P6.66, find the labeled node voltages for: (a)β = ∞ (b)β = 100

6.65 Design the circuit in Fig. P6.65 to obtain IE = 0.2 mA, VE = +2 V, and VC = +5 V. Design for IB2 = 0.1 mA. Use standard 5% resistors (refer to Table J.1 in Appendix J). The ...

D 6.64 The pnp transistor in Fig. P6.64 has β = 50. Find the value for RC that gives VC = +2 V. What happens if the transistor is replaced with another having β = 100? Give the value of ...

D *6.63 Design the circuit in Fig. P6.63 so that a current of 1 mA is established in the emitter and a voltage of −1 V appears at the collector. The transistor used has a nominal β of 100. However, ...

*6.62 Repeat the analysis of the circuits in Fig. P6.61(a), (b), (c), (d), and (e) using β =100. Find all the labeled node voltages and branch currents. (a) −0.915 V, +1.218 V; (b) +1.258 V, 0.49 mA; (c) −0.9 V, −0.2 ...

6.61 For the circuits in Fig. P6.61(a), (b), (c), (d), and (e), find values for the labeled node voltages and branch currents. Assume β to be very high.

SIM 6.60 For the circuit in Fig. P6.60, find VB, VE, and VC for RB = 100 kΩ, 10 kΩ, and 1 kΩ. Let β =100.