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Home > Ordnance Documents and other related manuals > > Figure 89. Forward Biased Junction In An NPN Transistor.
NPN Transistor Operation
Figure 90. Reverse - Biased Junction In An NPN Transistor

Electronic Principles
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ELECTRONIC PRINCIPLES - OD1647 - LESSON 1/TASK 2
FIGURE 89. FORWARD­BIASED JUNCTION IN AN NPN TRANSISTOR.
hole pairs. The minority carriers for the reverse­biased PN
junction are the electrons in the P material and the holes in
the N material. These minority carriers actually conduct the
current for the reverse­biased junction when electrons from the
P material enter the N material, and the holes from the N
material enter the P material. However, the minority current
electrons play the most important part in the operation of the
NPN transistor.
At this point it may be wondered why the second PN junction
(base­to­collector) is not forward biased like the first PN
junction (emitter­to­base). If both junctions were forward
biased, the electrons would have a tendency to flow from each
end section of the NPN transistor (emitter and collector) to the
P section (base). In essence, we would have two junction diodes
possessing a common base, thus eliminating any amplification and
defeating the purpose of the transistor. A word of caution is
­in order at this time. If the second PN junction is
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