Consider the series-shunt feedback circuit in Figure P12.37, with transistor parameters: \(h_{F E}=120, V_{B E}(\) on \()=0.7 \mathrm{~V}\), and \(V_{A}=\infty\).

(a) Determine the small-signal parameters for \(Q_{1}, Q_{2}\), and \(Q_{3}\). Using nodal analysis, determine:

(b) the small-signal voltage gain \(A_{v f}=v_{o} / v_{i}\),

(c) the input resistance \(R_{i f}\), and

(d) the output resistance \(R_{o f}\).

Transcribed Image Text:

Rif Cc HH www Vcc = 10 V R = 400 ww RCI= 1 8.8 www R = 75 ww RC2= 13 Q2 Q3 Rof Q RE3 = 1.4 k CE RE2= 3.6 ww REI= 0.5 Figure P12.37 ww Rp= 10 HH CF o