(a) Find a resistance REB that, when connected in parallel with the E-B junction of the pnp BJT of will yield VO 5 2.5 V for VI 5 2.5 V. Hint: read Problem 2.35 to understand the effect of REB upon...

(a) Find a resistance REB that, when connected in parallel with the E-B junction of the pnp BJT of will yield VO 5 2.5 V for VI 5 2.5 V. Hint: read Problem 2.35 to understand the effect of REB upon the VTC, and show that the modifi ed circuit gives vI 5 5 V 2 RBiB 2 (1 1 RByREB)vEB, where iB is the base current, which for a pnp BJT fl ows out of the base, and vEB is the voltage drop across the E-B junction. (b) Obtain a numerical relationship between vI and vO, and differentiate it with respect to vI to estimate the gain a at VO 5 2.5 V.