sol8 - ECE 440 HW8 Solutions Summer 2009 Thu, July 30, 2009...

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ECE 440 HW8 Solutions Summer 2009 Thu, July 30, 2009 1 1. Redraw Fig. 7-3 for an n + -p-n transistor, and explain the various components of carrier flow and current directions. 1. Electrons injected from the emitter but are lost to recombination with holes in the base region. 2. Electrons injected from the emitter which cross the base through diffusion and reach the collector. 3. Thermally generated electrons and holes cross the base-collector junction and form the reverse saturation current. 4. Holes supplied by base current to recombine with electrons. 5. Holes injected from base to emitter, crossing the forward-biased emitter-base junction. 2. Sketch the energy band diagram for a p-n-p transistor in equilibrium (all terminals grounded) and also under normal active bias (emitter junction forward biased, collector junction reverse biased). With the emitter terminal grounded, determine the signs (positive or negative) of the collector voltage V CE and base voltage V BE , relative to the emitter, that correspond to normal bias.
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sol8 - ECE 440 HW8 Solutions Summer 2009 Thu, July 30, 2009...

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