Reading from Chapter 4: Difference between revisions
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<math>\beta=i_C/i_D</math> |
<math>\beta=i_C/i_D</math> |
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*Operation in the active region: |
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*The base-emitter junction is forward biased. |
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*The base-collector junction is reverse biased. |
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*As amplifiers, BJTs operate in the active region. |
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*As switches, BJTs operate in saturation and cutoff. |
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Revision as of 23:50, 4 February 2010
Bipolar Junction Transistor
- An npn BJT has two layers of n-type material, known as the collector and emitter, and in between a layer of p-type material, known as the base.
- In order for a BJT to have a good performance, the base current needs to be small compared to the collector current.
- Operation in the active region:
*The base-emitter junction is forward biased. *The base-collector junction is reverse biased.
- As amplifiers, BJTs operate in the active region.
- As switches, BJTs operate in saturation and cutoff.