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Engineering LibreTexts

3: Physics of BJTs

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Learning Objectives

After completing this chapter, you should be able to:

  • Draw and explain the energy diagram for a biased bipolar junction transistor (BJT).
  • Describe the differences between NPN and PNP BJTs.
  • Explain forward-reverse bias operation.
  • Define the transistor parameters alpha and beta, and determine them from device curves and/or circuit currents.
  • Draw and explain the various regions of a BJT collector curve, along with Early voltage.
  • Describe and utilize the Ebers-Moll BJT model.
  • Describe the concept of the DC load line.
  • Solve and design basic switching and driver circuits utilizing BJTs.


This page titled 3: Physics of BJTs is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by James M. Fiore via source content that was edited to the style and standards of the LibreTexts platform.

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