The circuit parameters in Figure P4-15 are \(R_{C}=2\) \(\mathrm{k} \Omega, \beta=90, V_{\gamma}=0.7 \mathrm{~V}\), and \(V_{\mathrm{CC}}=5 \mathrm{~V}\). Select a value of \(R_{\mathrm{B}}\) such that the transistor is in the saturation mode when \(v_{\mathrm{S}} \geq 2 \mathrm{~V}\).

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RB VS Rc www ic + VCE + Vcc