1. Microelectric Circuits by Meiling CHEN 1 Lecture 14 Feedback

2. National United University Department of Electrical Engineering ~ Meiling CHEN topics The series-shunt feedback The series-series feedback The shunt-shunt feedback The shunt-series feedback

3. National United University Department of Electrical Engineering ~ Meiling CHEN Two port networks Two port Network Type I: Impedance z-parameters

4. National United University Department of Electrical Engineering ~ Meiling CHEN Type II: Admittance y-parameters Type III: hybrid h-parameters

5. National United University Department of Electrical Engineering ~ Meiling CHEN Type IV: Inverse-hybrid g-parameters Type V: transmission ABCD parameters

6. National United University Department of Electrical Engineering ~ Meiling CHEN Type VI: Inverse transmission parameters Two port Network combination: I. Cascade : ABCD parameters

7. National United University Department of Electrical Engineering ~ Meiling CHEN II: series-shunt

8. National United University Department of Electrical Engineering ~ Meiling CHEN n Ex: Find v 2 =?

9. National United University Department of Electrical Engineering ~ Meiling CHEN III: series-series

10. National United University Department of Electrical Engineering ~ Meiling CHEN IV: Shunt-shunt

11. National United University Department of Electrical Engineering ~ Meiling CHEN V: shunt-series

12. National United University Department of Electrical Engineering ~ Meiling CHEN General feedback structure Open loop gain Loop gain Closed-loop gain Mixer network Voltage  series Current  shunt Sampling network Voltage  shunt Current  Series

13. National United University Department of Electrical Engineering ~ Meiling CHEN Negative feedback properties Gain desensitivity Bandwidth extension Noise reduction Nonlinear distortion reduction

14. National United University Department of Electrical Engineering ~ Meiling CHEN 1.Gain desensitivity 2.Bandwidth extension

15. National United University Department of Electrical Engineering ~ Meiling CHEN 3.Noise reduction

16. National United University Department of Electrical Engineering ~ Meiling CHEN

17. Figure 8.3 Illustrating the application of negative feedback to reduce the nonlinear distortion in amplifiers. Curve (a) shows the amplifier transfer characteristic without feedback. Curve (b) shows the characteristic with negative feedback (   0.01) applied. 4.Nonlinear distortion reduction (a) without feedback (b) with feedback

18. National United University Department of Electrical Engineering ~ Meiling CHEN Mixer network: Voltage  series Current  shunt Sampling Feedback Topology

19. National United University Department of Electrical Engineering ~ Meiling CHEN Sampling network : Voltage  shunt Current  Series

20. National United University Department of Electrical Engineering ~ Meiling CHEN series shunt voltage current voltage shunt

21. National United University Department of Electrical Engineering ~ Meiling CHEN voltage shunt series current series voltage

22. National United University Department of Electrical Engineering ~ Meiling CHEN shunt current Shunt series

23. National United University Department of Electrical Engineering ~ Meiling CHEN Series- shunt

24. National United University Department of Electrical Engineering ~ Meiling CHEN voltage-mixing voltage-sampling (series–shunt) topology

25. National United University Department of Electrical Engineering ~ Meiling CHEN current-mixing current-sampling (shunt–series) topology

26. National United University Department of Electrical Engineering ~ Meiling CHEN voltage-mixing current-sampling (series–series) topology

27. National United University Department of Electrical Engineering ~ Meiling CHEN current-mixing voltage-sampling (shunt–shunt) topology

28. National United University Department of Electrical Engineering ~ Meiling CHEN The series–shunt feedback amplifier

29. National United University Department of Electrical Engineering ~ Meiling CHEN Passive network h 21 tends to zero

30. National United University Department of Electrical Engineering ~ Meiling CHEN

31. Series -Shunt

32. National United University Department of Electrical Engineering ~ Meiling CHEN The series–series feedback amplifier

33. National United University Department of Electrical Engineering ~ Meiling CHEN

34. Figure 8.15 (Continued) (c) A redrawing of the circuit in (b) with z 21 neglected. Series -Series

35. National United University Department of Electrical Engineering ~ Meiling CHEN

36. the shunt–shunt feedback amplifier

37. National United University Department of Electrical Engineering ~ Meiling CHEN

38.  Shunt -Shunt

39. National United University Department of Electrical Engineering ~ Meiling CHEN

40. The shunt–series feedback amplifier

41. National United University Department of Electrical Engineering ~ Meiling CHEN

42. Shunt -Series

43. National United University Department of Electrical Engineering ~ Meiling CHEN

44. TypeAmplifierFeedback parameter Series-Shunt (voltage- voltage) Series-Series (voltage- current) Shunt-Shunt (current- voltage) shunt-series (current- current)

45. National United University Department of Electrical Engineering ~ Meiling CHEN Example 8.1 Step 0 : Series-shunt feedback amplifier Step 1 : Amplifier analysis Amplifier  Voltage amplifier Feedback  h parameters

46. National United University Department of Electrical Engineering ~ Meiling CHEN Step 2 : Feedback network analysis

47. National United University Department of Electrical Engineering ~ Meiling CHEN Step 3 : Amp+Feedback analysis Feedback AMP

48. National United University Department of Electrical Engineering ~ Meiling CHEN Example 8.2 Step 0 : Series-series feedback amplifier Amplifier  Transconductance amplifier Feedback  z parameters

49. National United University Department of Electrical Engineering ~ Meiling CHEN Step 1 : Amplifier analysis

50. National United University Department of Electrical Engineering ~ Meiling CHEN Step 2 : Analysis feedback Amp The equivalent circuit

51. National United University Department of Electrical Engineering ~ Meiling CHEN Step 3 : Amp+Feedback analysis

52. National United University Department of Electrical Engineering ~ Meiling CHEN Example 8.3 Shunt-shunt: R m amplifier + y parameter

53. National United University Department of Electrical Engineering ~ Meiling CHEN

55. Example 8.4 1.DC analysis

56. National United University Department of Electrical Engineering ~ Meiling CHEN Shunt-series current Mixing – current sampling Amplifier: Current Amplifier Feedback network: hybrid parameters

57. National United University Department of Electrical Engineering ~ Meiling CHEN

58. neglect