Consider the bias circuit shown in Figure P13.10. Let \(V^{+}=3 \mathrm{~V}\), \(V^{-}=-3 \mathrm{~V}, R_{1}=80 \mathrm{k} \Omega\), and \(R_{E}=3.5 \mathrm{k} \Omega\). Assume transistor parameters of \(I_{S}=5 \times 10^{-15} \mathrm{~A}\) for \(Q_{1}, Q_{2}, Q_{3} ; I_{S}=3 \times 10^{-15} \mathrm{~A}\) for \(Q_{4}\); and \(I_{S}=10^{-15} \mathrm{~A}\) for \(Q_{5}\).

(a) Find the currents \(I_{\mathrm{REF}}, I_{3}, I_{4}\), and \(I_{5}\).

(b) Repeat part (a) for \(I_{S}=8 \times 10^{-15} \mathrm{~A}\) for \(Q_{4}\) and \(I_{S}=2 \times 10^{-15} \mathrm{~A}\) for \(Q_{5}\).

Transcribed Image Text:

Q3 RE Q2 IREF www Figure P13.10 R 24 Q5