A BiCMOS amplifier is shown in Figure P13.50. The transistor parameters \(\operatorname{are} V_{T P}=-0.4 \mathrm{~V}, k_{p}^{\prime}=40 \mu \mathrm{A} / \mathrm{V}^{2}, W / L=40, \lambda=0.035 \mathrm{~V}^{-1}, \beta=120\), and \(V_{A}=150 \mathrm{~V}\). The bias current is \(I_{Q}=250 \mu \mathrm{A}\).

(a) Determine the small-signal parameters of the transistors.

(b) Find the small-signal differential voltage gain.

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= T V+ 10 M M2 12 Q3 Figure P13.50 V