Because of the distributed nature of rb, we can better approximate high-frequency BJT behavior by splitting C into two parts, as shown in Fig. P6.32. Assuming Rsig 5 1 kV, rb 5 300 V, 0 5 100, gm 5...

Because of the distributed nature of rb, we can better approximate high-frequency BJT behavior by splitting C into two parts, as shown in Fig. P6.32. Assuming Rsig 5 1 kV, rb 5 300 V, 0 5 100, gm 5 1y(15 V), ro//RL 5 10 kV, C5 10 pF, and C1 5 C2 5 0.5 pF, estimate f23 dB via OCTC analysis. Comment on your fi ndings, and specify under what conditions it is acceptable to lump C1 with C2.