The transistor parameters for the circuit shown in Figure P11.29 are \(\beta=180, V_{B E}\) (on) \(=0.7 \mathrm{~V}\) (except for \(\left.Q_{4}\right), V_{A}=\infty\) for \(Q_{1}\) and \(Q_{2}\), and \(V_{A}=100 \mathrm{~V}\) for \(Q_{3}\) and \(Q_{4}\).

(a) Determine \(R_{1}\) and \(R_{2}\) such that \(I_{1}=0.5 \mathrm{~mA}\) and \(I_{Q}=140 \mu \mathrm{A}\).

(b) Determine the common-mode input resistance.

(c) For \(R_{C}=40 \mathrm{k} \Omega\), determine the common-mode voltage gain.

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+10 V RC Rc Q Q2 V2 Figure P11.29 Q4 23 www R -10 V RI