(a) The Darlington pair circuit in Figure 11.45 has new bias current levels of \(I_{\text {BIAS } 1}=0.25 \mathrm{~mA}\) and \(I_{\text {BIAS } 2}=0.50 \mathrm{~mA}\). The transistor parameters are \(K_{n}=0.2 \mathrm{~mA} / \mathrm{V}^{2}, V_{T N}=0.4 \mathrm{~V}\), and \(\lambda=0\) for \(M_{1} ;\) and \(\beta=150\), \(V_{B E}(\mathrm{on})=0.7 \mathrm{~V}\), and \(V_{A}=\infty\) for \(Q_{2}\). Determine the small-signal parameters for each transistor and find the composite transconductance.

(b) Repeat part (a) for bias currents of \(I_{\text {BIAS } 1}=0.05 \mathrm{~mA}\) and \(I_{\text {BIAS } 2}=0.50 \mathrm{~mA}\).

Transcribed Image Text:

1 M Bias! = 25 A+ Q2 Bias2 100 A Figure 11.45 Figure for Exercise TYU 11.16