Consider the series-shunt feedback circuit in given Figure, with transistor parameters: hFE = 120, VBE (on) = 0.7 V, and VA = ∞.
(a) Determine the small-signal parameters for Q1, Q2, and Q3. Using nodal analysis, determine:
(b) the small-signal voltage gain Av f = vo/vi,
(c) the input resistance Ri f, and (d) the output resistance Rof.
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