Consider the circuit in Figure P10.17. The transistor parameters are: \(\beta=80\), \(V_{B E}(\mathrm{on})=0.7 \mathrm{~V}\), and \(V_{A}=\infty\).

(a) Derive the expression for \(I_{O}\) in terms of \(I_{\mathrm{REF}}, \beta\), and \(R_{2}\).

(b) For \(R_{2}=10 \mathrm{k} \Omega\) and \(V^{+}=10 \mathrm{~V}\), design the circuit such that \(I_{O}=0.70 \mathrm{~mA}\). What is the value of \(I_{\mathrm{REF}}\) ?

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V+ IREF R Figure P10.17 www R