The parameters of the basic source-follower circuit in Figure P12.41 are \(R_{S}=1.5 \mathrm{k} \Omega, V_{T N}=1.2 \mathrm{~V}\), and \(\lambda=0\). Assume the transistor is biased at \(I_{D Q}=1.2 \mathrm{~mA}\).

(a) If the transistor conduction parameter is \(K_{n}=\) \(1.5 \mathrm{~mA} / \mathrm{V}^{2}\), determine (i) \(A_{v f}=v_{o} / v_{i}\) and (ii) \(R_{o f}\).

(b) If the conduction parameter increases by 50 percent to \(K_{n}=2.25 \mathrm{~mA} / \mathrm{V}^{2}\), determine the percent change in (i) \(A_{v f}=v_{o} / v_{i}\) and (ii) \(R_{o f}\).

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VDD Figure P12.41 R of RS