Design the Widlar current source shown in Figure 10.9 such that \(I_{\text {REF }}=\) \(2 \mathrm{~mA}\) and \(I_{O}=50 \mu \mathrm{A}\). Let \(V^{+}=15 \mathrm{~V}\) and \(V^{-}=0\). The transistors are matched, and \(V_{B E}=0.7 \mathrm{~V}\) at \(1 \mathrm{~mA}\).

V+ IREF Ici www Q R Ro Ic2=10 -oVc2 Q2 + + VBEL VBE2 RE IE2 V Figure 10.9 Widlar current source