(a) The Darlington pair circuit in Figure 11.45 has new bias current levels of IBIAS1 = 0.25 mA and IBIAS2 = 0.50 mA. The transistor parameters are Kn= 0.2 mA/V2, VTN = 0.4 V, and λ = 0 for M1; and β = 150, VBE(on) = 0.7 V, and VA = ∞ for Q2. Determine the small-signal parameters for each transistor and find the composite transconductance. (b) Repeat part (a) for bias currents of IBIAS1 = 0.05 mA and IBIAS2 = 0.50 mA.
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