ElectronicsI_L20 - Lecture 20 Saturation If the CBJ is...

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Lecture 20
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Saturation If the CBJ is biased negatively (not reverse biased!) we find that below ~0.4V it will start to go into forward bias At this point, the current through the collector drops. This is called saturation – Don’t confuse it with MOSFET saturation – It is actually more like the Triode region in the MOSFET As the CBJ goes into forward bias, it starts injecting electrons into the base as well. This reduces the slope of the carrier concentration profile, thus reducing the diffusion current. T BC T BE V v R S V v S C e I e I i = α
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PNP The PNP has it’s layers in the opposite polarity as the NPN. We can thus expect that the behavior will be the same, just with applied voltages in the opposite polarity and currents flowing in the opposite direction.
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BJT Symbols The symbol for the BJT is shown here: – The emitter is designated by an arrowhead – Remember that this matters because the emitter and collector are not interchangeable – The direction of the arrowhead designates whether the device is npn or pnp The typical biasing configuration for each device to operate in the active mode is shown
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Example 1
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ElectronicsI_L20 - Lecture 20 Saturation If the CBJ is...

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