These electrons will attempt to recombine with the majority base holes, however, because the base is physically thin and lightly doped, only a small percentage of the injected electrons will recombine with base holes and exit the base terminal back to ground. Bipolar transistors generally comprise npn or pnp junctions of either silicon (Si) or germanium (Ge). The transistor operates in the active region between saturation and cutoff. pptx), PDF File (.pdf), Text File (.txt) or view presentation slides. IC is at maximum and VCE is at minimum (VCE max VCEsat VCEO) in the saturation region. Bipolar Junction Transistor (Bjt) - Free download as Powerpoint Presentation (.ppt /. As long as there is sufficient potential from the emitter supply, the electrons will be pushed into the base. The kind that uses both free electrons and holes. Bipolar Junction Transistor (BJT) CHAPTER 3 Note: VCE is at maximum and IC is at minimum (ICmaxICEO) in the cutoff region. The base-emitter depletion creates an energy hill just as it did with a single PN junction. From the left side of the diagram, electrons exit the emitter supply and enter the N emitter. \): Forward-reverse bias, electron flow.Įlectron flow will facilitate this explanation so we'll draw the current directions using dashed lines.
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