(a) For the Widlar current source shown in Figure 10.9, find \(I_{\text {REF }}, I_{O}\), and \(V_{B E 2}\) if \(R_{1}=50 \mathrm{k} \Omega, R_{E}=3 \mathrm{k} \Omega, V^{+}=5 \mathrm{~V}\), and \(V^{-}=-5 \mathrm{~V}\). The transistor parameters are \(\beta=120\) and \(V_{B E 1}\) (on) \(=0.7 \mathrm{~V}\).

(b) Determine \(R_{o}\) for \(V_{A}=80 \mathrm{~V}\).

Transcribed Image Text:

V+ IREFR Ici + VBEL Ic2=10 Ro + VBE2 Q2 IE2>RE V- Figure 10.9 Widlar current source