For the Darlington configuration shown in Fig. 12.18, show that for 1 1 and 2 1: (a) The
Chapter 12, Problem 12.36(choose chapter or problem)
For the Darlington configuration shown in Fig. 12.18, show that for 1 1 and 2 1: (a) The equivalent composite transistor has 12. (b) If the composite transistor is operated at a current IC, then Q2 will be operating at a collector current approximately equal to IC, and Q1 will be operating at a collector current approximately equal to IC/2. (c) The composite transistor has a baseemitter voltage VBE 2VT ln IC/IS VT ln 2 , where IS is the saturation current of each of Q1 and Q2. (d) The composite transistor has an equivalent r 212 VT /IC . (e) The composite transistor has an equivalent gm 1 2 IC/VT . *12.37 F
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