Consider the current gain amplifier shown in given figure.
The transistor parameters are Kn = Kp = 10 mA/V2, VT N = 1 V, VT P = -1 V, and λn = λp = 0. The LED turn-on voltage is Vγ = 1.6 V. Assume the LED small-signal resistance is rf = 0.
(a) Determine the quiescent currents IDQ1 and IDQ2.
(b) Show that the small-signal current gain is given by
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(c) Calculate the value of Ai.
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