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PNP

PNP. Section 4.3,3.6. Schedule. Modes of Operation. Applications: 1. Saturation and cut-off mode are used in digital circuits. 2. Active mode is used in the amplifier design. Collector Voltage Versus Base Current. VBE versus IB. VCE Versus IB. Base Current. electron current.

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PNP

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  1. PNP Section 4.3,3.6

  2. Schedule

  3. Modes of Operation Applications: 1. Saturation and cut-off mode are used in digital circuits. 2. Active mode is used in the amplifier design.

  4. Collector Voltage Versus Base Current

  5. VBE versus IB

  6. VCE Versus IB

  7. Base Current electron current Hole current The proportional of hole current and electron current is determined by dopants (ND and NA). Even though the presence of holes are minimized, a small number of holes still must enter through the base.

  8. Operation of an NPN Transistor in the Active Region Electrons are injected into the BC junction Electrons are injected into the B; holes to the E. Electrons are swept across the reversed biased BC

  9. BJT Current Assumption: BEJ: Forward Biased BCJ: Reverse Biased

  10. Extension of a PNP transistor (PNP transistor) (NPN transistor) • Emitter-base junction is forward • biased. • Holes are injected into the base. • Base-collector junction is reverse • Biased. • Injected holes in the base is swept • across the base-collector junction by • the electric field.

  11. Large Signal Model of a BJT Called “large” signal model because this model is applicable even if VBE changes from 300 mV to 800 mV

  12. Large-Signal Model of BJT Transistors (NPN) (PNP) C C E E

  13. Experiments

  14. Use 2n3904 npn BJT in Simulation (Error!, put 2n3904 here!)

  15. Include 2n3904 (NPN) model

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