The circuit shown in Figure P12.38 is an ac equivalent circuit of a feedback amplifier. The transistor parameters are \(h_{F E}=100\) and \(V_{A}=\infty\). The quiescent collector currents are \(I_{C 1}=14.3 \mathrm{~mA}, I_{C 2}=4.62 \mathrm{~mA}\), and \(I_{C 3}=\) \(4.47 \mathrm{~mA}\).

(a) Determine the closed-loop voltage gain \(A_{v f}=V_{o} / V_{i}\). Compare this value to the approximate ideal value of \(A_{v f} \cong\left(R_{F}+R_{E}\right) / R_{E}\).

(b) Determine the values of \(R_{i f}\) and \(R_{o f}\).

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RC= 0.30 Rc2= 0.65 Rif V, 0- Q2 ww RF = 1.2 kQ RE=500 Figure P12.38 Q3 Rof