Transistor diode model
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
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.
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.
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
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