Engineering:Transistor diode model
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In a diode model two diodes are connected back-to-back to make a PNP or NPN bipolar junction transistor (BJT) equivalent. This model is theoretical and qualitative.
Examples
File:Transistor diode model.png
Structure of a transistor is quite similar to a pair-of diode connected head-on
PNP transistor
To make a PNP transistor, the cathodes of both diodes are back-to-back connected to form a large N type base region.[1]
NPN transistor
To make an NPN transistor, the anodes of both diodes are back-to-back connected to form a large P type base region.[1]
Base biasing
As the base region is a combination of two anodes or two cathodes, and is not lightly doped, more base biasing is required for making this model operational.[citation needed]
References
External links
- https://en.wikiversity.org/wiki/Electronic_Circuits/Introduction_to_the_simple_diode_npn_model
- https://www.st-andrews.ac.uk/~www_pa/Scots_Guide/info/comp/active/BiPolar/dtob.gif
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