R, RC R3 Rg Two-port Figure P13.62

The ac equivalent circuit for an amplifier is shown . Assume the capacitors have infinite value, R_I = 10 kΩ, R_B = 5 MΩ, R_C = 1.5 MΩ, and R₃ = 3.3 MΩ. Calculate the input resistance and output resistance for the amplifier if the BJT Q-point is (2 μA, 2 V). Assume β_o = 40 and V_A = 50 V.

Rework the given problem if I_C is increased to 100 μA, and the values of R_C, R_B, and R₃ are all reduced by a factor of 50.