(a) Find an expression for the voltage gain \(v_{\mathrm{O}} / v_{\mathrm{S}}\) in Figure P4-8.

(b) Let \(R_{\mathrm{S}}=1 \mathrm{k} \Omega, R_{\mathrm{L}}=100 \Omega\) and \(\mu=50\). Find the voltage gain \(v_{\mathrm{O}} / v_{\mathrm{S}}\) as a function of \(R_{\mathrm{F}}\). What is the voltage gain when \(R_{\mathrm{F}}\) is an open circuit, a short circuit, and for \(R_{\mathrm{F}}=\) \(100 \Omega\) ?
(c) Simulate the circuit in Multisim and perform a parameter sweep on \(R_{\mathrm{F}}\) from \(0.1 \Omega\) to \(10 \mathrm{k} \Omega\). Use the cursor to find your output at \(R_{\mathrm{F}}=100 \Omega\). How does your answer compare with part (b)?

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