The modified Widlar current-source circuit shown in Figure P10.34 is biased at \(V^{+}=3 \mathrm{~V}\) and \(V^{-}=-3 \mathrm{~V}\).

(a) For \(I_{S 1}=I_{S 2}=10^{-15} \mathrm{~A}\) and \(R_{E 1}=500 \Omega\), design the circuit such that \(I_{\mathrm{REF}}=0.5 \mathrm{~mA}\) and \(I_{O}=0.2 \mathrm{~mA}\). Neglect base currents. What are the values of \(V_{B E 1}\) and \(V_{B E 2}\) ?

(b) Repeat part (a) for \(I_{S 1}=10^{-15} \mathrm{~A}\) and \(I_{S 2}=2 \times 10^{-15} \mathrm{~A}\).

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