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Bipolar Junction Transistors (BJT) Tai-Cheng Lee Electrical Engineering/GIEE, NTU

Bipolar Junction Transistors (BJT) Tai-Cheng Lee Electrical Engineering/GIEE, NTU. Why BJT. Application. Device Structure. Operation in Active Mode-(1). Operation in Active Mode-(2). Profile of minority carrier concentration. Operation in Active Mode-(3). Collector current.

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Bipolar Junction Transistors (BJT) Tai-Cheng Lee Electrical Engineering/GIEE, NTU

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  1. Bipolar Junction Transistors (BJT) Tai-Cheng Lee Electrical Engineering/GIEE, NTU

  2. Why BJT • Application

  3. Device Structure

  4. Operation in Active Mode-(1)

  5. Operation in Active Mode-(2) • Profile of minority carrier concentration

  6. Operation in Active Mode-(3) • Collector current

  7. Operation in Active Mode-(4) • Base current

  8. Operation in Active Mode-(4) • Emitter current

  9. Equivalent Circuit in Active Mode

  10. Structure of Actual Transistor • Equivalent circuit model for reverse active

  11. Ebers-Moll (EM) Model-(1) • Universal model for BJT

  12. Ebers-Moll (EM) Model-(2) • iC –vCB characteristic of an npn transistor

  13. Operation of PNP Transistors

  14. Current-Voltage Characteristics-(1) →

  15. Current-Voltage Characteristics-(2) • Graphical representation • Thermal effect

  16. Common-BaseCharacteristics-(1)

  17. Early Effect • Large-signal circuit model

  18. Common-Emitter Characteristics –(1)

  19. Common-Emitter Characteristics –(2) • Saturation voltage VCEsat

  20. Common-Emitter Characteristics –(3) • Saturation resistance RCEsat

  21. Common-Emitter Characteristics –(4) • Analyze by E-M Model • Breakdown voltage

  22. BJT Amplifier and Switch-(1) • Large-Signal operation

  23. BJT Amplifier and Switch-(2) • Graphical analysis

  24. BJT Amplifier and Switch-(2)

  25. BJT Amplifier and Switch-(3) • Operation as a switch

  26. BJT Circuits at DC-(1) • Example 5.4

  27. BJT Circuits at DC-(2) • Example 5.5

  28. BJT Circuits at DC-(3) • Example 5.6

  29. BJT Circuits at DC-(4) • Example 5.12

  30. Biasing BJT -(1) • Fixed VBE

  31. Biasing BJT -(2) • Classical discrete-circuit bias arrangement

  32. Biasing BJT -(3) • Two power supplies • Collector-to-base feedback

  33. Biasing BJT -(4) • By a constant current source

  34. Small-Signal Operation-(1) • BJT Amplifier

  35. Small-Signal Operation-(2) • Collector current and transconductance

  36. Small-Signal Operation-(3) • Base current and the input resistance at base • Emitter current and the input resistance at emitter

  37. Small-Signal Operation-(4) • Voltage gain

  38. Small-Signal Models-(1) • DC and AC signal separation • Hybrid-p model

  39. Small-Signal Models-(2) • T model

  40. Small-Signal Models-(3) • Ex 5.14

  41. Small-Signal Models-(4) • Perform small-signal analysis on the circuit schematic • Early Effect

  42. Single-Stage BJT Amplifier-(1) • Basic structure

  43. Single-Stage BJT Amplifier-(2) • Characterizing BJT Amplifier • Refer Table 5.5

  44. Common-Emitter Amplifier-(1) • Small-signal model

  45. Common-Emitter Amplifier-(2)

  46. Common-Emitter Amplifier with Emitter Resistance-(1) • Small-signal model

  47. Common-Emitter Amplifier with Emitter Resistance-(2)

  48. Common-Emitter Amplifier with Emitter Resistance-(3)

  49. Common-Base Amplifier -(1) • Small-signal model

  50. Common-Base Amplifier -(2)

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