In the circuit of Fig. P4.69 let VCC 5 10 V and R 5 8.6 kV. Moreover, let the BJTs have Is3 5 Is4, Is1 5 Is2, and VEBp 5 VBEn 5 0.7 V, where subscripts p and n refer to the pnp and npn pairs,...

In the circuit of Fig. P4.69 let VCC 5 10 V and R 5 8.6 kV. Moreover, let the BJTs have Is3 5 Is4, Is1 5 Is2, and VEBp 5 VBEn 5 0.7 V, where subscripts p and n refer to the pnp and npn pairs, respectively. (a) Assuming negligible base currents, fi nd IC and VC if VAp 5 VAn 5 100 V. (b) Repeat if VAp 5 30 V and VAn 5 100 V. (c) Repeat parts (a) and (b) if Fn 5 250. Justify your fi ndings at each step.