The common-base amplifier has the properties: β = 120, VBE(on) = 0.7 V

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The common-base amplifier has the properties: β = 120, VBE(on) = 0.7 V, VA = ∞, and ICQ = 1.25 mA. Note that the input is on the right and the output is on the left. a. (3 pts. ) Find the small-signal parameters rπ, r0, and gm. b. (5 pts. ) Sketch the small-signal equivalent circuit. c. (5 pts. ) Calculate the voltage gain Av = V0 Vi. d. (5 pts. ) Calculate the current gain Ai = I0 Ii.

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The common-base amplifier has the properties: $β = 120, V_{B E} (o n) = 0.7 V, V_{A} = \infty$ , and $I_{C Q} = 1.25 m A$ . Note that the input is on the right and the output is on the left. a. (3pts.) Find the small-signal parameters $r_{π}, r_{0}$ , and $g_{m}$ . b. (5pts.) Sketch the small-signal equivalent circuit. c. (5pts.) Calculate the voltage gain $A_{v} = \frac{V_{0}}{V_{i}}$ . d. (5pts.) Calculate the current gain $A_{i} = \frac{I_{0}}{I_{i}}$ .