Figure P7.34 shows the ac equivalent circuit of two identical commonsource circuits in cascade. The transistor parameters are \(K_{n 1}=K_{n 2}=\) \(0.8 \mathrm{~mA} / \mathrm{V}^{2}, \lambda_{1}=\lambda_{2}=0.02 \mathrm{~V}^{-1}\), and \(I_{D Q 1}=I_{D Q 2}=0.5 \mathrm{~mA}\). The circuit parameters are \(R_{D}=5 \mathrm{k} \Omega\) and \(C_{L}=12 \mathrm{pF}\).

(a) Derive the expressions for the voltage transfer functions (i) \(T_{1}(s)=V_{o 1}(s) / V_{i}(s)\), (ii) \(T_{2}(s)=\) \(V_{o}(s) / V_{o 1}(s)\), and (iii) \(T(s)=V_{o}(s) / V_{i}(s)\).

(b) Determine the \(-3 \mathrm{~dB}\) frequencies for (i) \(T_{1}(s)\), (ii) \(T_{2}(s)\), and (iii) \(T(s)\).

(c) Sketch the Bode plot for the magnitude of the transfer function \(T(s)\).

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1 ww Rp M CL Vol Figure P7.34 www Rp M CL