B.2. Base-Width Dependence on Junction Voltage
In real transistors, the base width depends on the voltage applied across a pn junction. The effect is known as base-width modulation. A diagrammatic representation of the effect is illustrated in Fig. B.6. Not shown in the diagrams in Unit B.1 of the pnp structure are the depletion regions, which are shown shaded in Fig. B.6. These are the transition regions that are depleted of free carriers, and in which the barrier is formed that impedes electron and hole flow to the p regions and n region, respectively. The base width (n region) is actually the width between the depletion regions. In the diagram of Fig. B.6, we define wBo for VBC = 0 and wB for VBC > 0.
Figure B.6. Diagrammatic pnp structure ...
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