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PNP transistor (structure, operation, models)

PNP transistor (structure, operation, models). Reading: Chapter 4.6. PNP Transistor. The operating principle of a PNP BJT is the same as that of an NPN BJT. Note that the bias-voltage polarities are reversed for the PNP device, compared to an NPN device.

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PNP transistor (structure, operation, models)

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  1. PNP transistor (structure, operation, models) Reading: Chapter 4.6

  2. PNP Transistor The operating principle of a PNP BJT is the same as that of an NPN BJT. Note that the bias-voltage polarities are reversed for the PNP device, compared to an NPN device. The emitter is biased at a higher potential than the base. The collector is biased at a lower potential than the base.

  3. NPN vs. PNP BJTs The directions of current flow and operation modes for NPN andPNP BJTs are shown below:

  4. PNP BJT Terminal Currents

  5. Large-Signal Model for PNP BJT

  6. PNP BJT Biasing Note that the emitter is biased at a higher potential than the base and the collector.

  7. Small-Signal Analysis

  8. PNP BJT Small-Signal Model The small-signal model for a PNP transistor is identical to that of an NPN transistor. Note that the polarity of the small-signal currents and voltages are defined to be in the opposite direction with respect to the large-signal model. This is OK, because the small-signal model is used only to determine changes in currents and voltages.

  9. Small-Signal Model Example 1

  10. Small-Signal Model Example 2 Note that the small-signal model is identical to that in the previous example.

  11. Small-Signal Model Example 3 Note that the small-signal model is identical to that in the previous examples.

  12. Small-Signal Model Example 4

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