1. 1 Tai-Cheng Lee Spring 2006 Bipolar Junction Transistors (BJT) Tai-Cheng Lee Electrical Engineering/GIEE, NTU

2. 2 Tai-Cheng Lee Spring 2006 Why BJT Application

3. 3 Tai-Cheng Lee Spring 2006 Device Structure

4. 4 Tai-Cheng Lee Spring 2006 Operation in Active Mode-(1)

5. 5 Tai-Cheng Lee Spring 2006 Operation in Active Mode-(2) Profile of minority carrier concentration

6. 6 Tai-Cheng Lee Spring 2006 Operation in Active Mode-(3) Collector current

7. 7 Tai-Cheng Lee Spring 2006 Operation in Active Mode-(4) Base current

8. 8 Tai-Cheng Lee Spring 2006 Operation in Active Mode-(4) Emitter current

9. 9 Tai-Cheng Lee Spring 2006 Equivalent Circuit in Active Mode

10. 10 Tai-Cheng Lee Spring 2006 Structure of Actual Transistor Equivalent circuit model for reverse active

11. 11 Tai-Cheng Lee Spring 2006 Ebers-Moll (EM) Model-(1) Universal model for BJT

12. 12 Tai-Cheng Lee Spring 2006 Ebers-Moll (EM) Model-(2) i C –v CB characteristic of an npn transistor

13. 13 Tai-Cheng Lee Spring 2006 Operation of PNP Transistors

14. 14 Tai-Cheng Lee Spring 2006 Current-Voltage Characteristics-(1) →

15. 15 Tai-Cheng Lee Spring 2006 Current-Voltage Characteristics-(2) Graphical representation Thermal effect

16. 16 Tai-Cheng Lee Spring 2006 Common-Base Characteristics-(1)

17. 17 Tai-Cheng Lee Spring 2006 Early Effect Large-signal circuit model

18. 18 Tai-Cheng Lee Spring 2006 Common-Emitter Characteristics –(1)

19. 19 Tai-Cheng Lee Spring 2006 Common-Emitter Characteristics –(2) Saturation voltage V CEsat

20. 20 Tai-Cheng Lee Spring 2006 Common-Emitter Characteristics –(3) Saturation resistance R CEsat

21. 21 Tai-Cheng Lee Spring 2006 Common-Emitter Characteristics –(4) Analyze by E-M Model Breakdown voltage

22. 22 Tai-Cheng Lee Spring 2006 BJT Amplifier and Switch-(1) Large-Signal operation

23. 23 Tai-Cheng Lee Spring 2006 BJT Amplifier and Switch-(2) Graphical analysis

24. 24 Tai-Cheng Lee Spring 2006 BJT Amplifier and Switch-(2)

25. 25 Tai-Cheng Lee Spring 2006 BJT Amplifier and Switch-(3) Operation as a switch

26. 26 Tai-Cheng Lee Spring 2006 BJT Circuits at DC-(1) Example 5.4

27. 27 Tai-Cheng Lee Spring 2006 BJT Circuits at DC-(2) Example 5.5

28. 28 Tai-Cheng Lee Spring 2006 BJT Circuits at DC-(3) Example 5.6

29. 29 Tai-Cheng Lee Spring 2006 BJT Circuits at DC-(4) Example 5.12

30. 30 Tai-Cheng Lee Spring 2006 Biasing BJT -(1) Fixed V BE

31. 31 Tai-Cheng Lee Spring 2006 Biasing BJT -(2) Classical discrete-circuit bias arrangement

32. 32 Tai-Cheng Lee Spring 2006 Biasing BJT -(3) Two power supplies Collector-to-base feedback

33. 33 Tai-Cheng Lee Spring 2006 Biasing BJT -(4) By a constant current source

34. 34 Tai-Cheng Lee Spring 2006 Small-Signal Operation-(1) BJT Amplifier

35. 35 Tai-Cheng Lee Spring 2006 Small-Signal Operation-(2) Collector current and transconductance

36. 36 Tai-Cheng Lee Spring 2006 Small-Signal Operation-(3) Base current and the input resistance at base Emitter current and the input resistance at emitter

37. 37 Tai-Cheng Lee Spring 2006 Small-Signal Operation-(4) Voltage gain

38. 38 Tai-Cheng Lee Spring 2006 Small-Signal Models-(1) DC and AC signal separation Hybrid-  model

39. 39 Tai-Cheng Lee Spring 2006 Small-Signal Models-(2) T model

40. 40 Tai-Cheng Lee Spring 2006 Small-Signal Models-(3) Ex 5.14

41. 41 Tai-Cheng Lee Spring 2006 Small-Signal Models-(4) Perform small-signal analysis on the circuit schematic Early Effect

42. 42 Tai-Cheng Lee Spring 2006 Single-Stage BJT Amplifier-(1) Basic structure

43. 43 Tai-Cheng Lee Spring 2006 Single-Stage BJT Amplifier-(2) Characterizing BJT Amplifier Refer Table 5.5

44. 44 Tai-Cheng Lee Spring 2006 Common-Emitter Amplifier-(1) Small-signal model

45. 45 Tai-Cheng Lee Spring 2006 Common-Emitter Amplifier-(2)

46. 46 Tai-Cheng Lee Spring 2006 Common-Emitter Amplifier with Emitter Resistance-(1) Small-signal model

47. 47 Tai-Cheng Lee Spring 2006 Common-Emitter Amplifier with Emitter Resistance-(2)

48. 48 Tai-Cheng Lee Spring 2006 Common-Emitter Amplifier with Emitter Resistance-(3)

49. 49 Tai-Cheng Lee Spring 2006 Common-Base Amplifier -(1) Small-signal model

50. 50 Tai-Cheng Lee Spring 2006 Common-Base Amplifier -(2)

51. 51 Tai-Cheng Lee Spring 2006 Common-Collector Amplifier -(1) CC amplifier is as known as emitter follower Small-signal model

52. 52 Tai-Cheng Lee Spring 2006 Common-Collector Amplifier -(2) Resistance reflection rule to the base side

53. 53 Tai-Cheng Lee Spring 2006 Common-Collector Amplifier -(3) Resistance reflection rule to the emitter side

54. 54 Tai-Cheng Lee Spring 2006 Common-Collector Amplifier -(4) Thevenin equivalent circuit Summary and comparison