The transistors in the output stage in Figure 8.34 are all matched. Their parameters are \(\beta=60\) and \(I_{S}=5 \times 10^{-13} \mathrm{~A}\). Resistors \(R_{1}\) and \(R_{2}\) are replaced by \(3 \mathrm{~mA}\) ideal current sources, and \(R_{3}=R_{4}=0\). Let \(V^{+}=10 \mathrm{~V}\) and \(V^{-}=-10 \mathrm{~V}\).

(a) Determine the quiescent collector currents in the four transistors for \(v_{I}=v_{O}=0\).

(b) For a load resistance of \(R_{L}=200 \Omega\) and a peak output voltage of \(6 \mathrm{~V}\), determine the current gain and voltage gain of the circuit.

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iB1 www R JiEI 23 R3 iB2 R4 Q2 iE2 Q4 ww R 150 ww RL Figure 8.34 Class-AB output stage with input buffer transistors