NOTE: Most of the current is due to electrons moving from the emitter through base to the collector.
N I co - Inc + VCB - p- Electrons + Holes + Ipe Ine n+ VBE - Bulk-recombination Current Figure : Current flow (components) for an n-p-n BJT in the active region. Base doping is slightly higher ~ 1010 – 1011 īJT Current & Voltage - Equations IE IC IE IC - VCE + + VEC - E C E C - + + VBE VBC IB VEB VCB IB - + + B B n p n IE = IB + IC VCE = -VBC + VBE p n p IE = IB + IC VEC = VEB - VCB.The Two Types of BJT Transistors: npn pnp n p n p n p E C E C C C Cross Section Cross Section B B B B Schematic Symbol Schematic Symbol E E The BJT – Bipolar Junction Transistor Note: Normally Emitter layer is heavily doped, Base layer is lightly doped and Collector layer has Moderate doping. Bipolar Junction Transistor Basics C BJTs B E
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