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Chapter 10 Stability and Frequency Compensation

Chapter 10 Stability and Frequency Compensation. Basic Stability. Stable and Unstable Systems. Stability and Complex Poles. Basic One Pole Bode Plot. Multipole Systems. Phase Margin. Phase Margin (cont.). -180. Phase Margin,  m = 45 . Phase Margin (cont.).

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Chapter 10 Stability and Frequency Compensation

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  1. Chapter 10Stability and Frequency Compensation

  2. Basic Stability

  3. Stable and Unstable Systems

  4. Stability and Complex Poles

  5. Basic One Pole Bode Plot

  6. Multipole Systems

  7. Phase Margin

  8. Phase Margin (cont.) -180 Phase Margin, m = 45

  9. Phase Margin (cont.)

  10. Small Signal Analysis Limitations Small signal analysis yields 65  of m, but large signal transient response is different. Large signal simulation includes effects not seen in small signal analysis.

  11. Frequency Compensation Compensation is the manipulation of gain and/or pole positions to improve phase margin.

  12. Compensation (cont.)

  13. Single Ended Single Stage Amp Dominant Pole at Output

  14. Pre- and Post-Compensation

  15. Compensation (cont.)

  16. Compensation Example

  17. Fully Differential Telescopic Op-Amp

  18. Cascode Current Source Impedance

  19. Compensation (cont.)

  20. Compensation (cont.) Recall, from Chap. 6: (assume CC includes CGD9)

  21. Compensation (cont.)

  22. Compensation (cont.)

  23. Phase and Magnitude of RHP Zero

  24. RHP Zero Removal

  25. RHP Zero Removal (cont.)

  26. Miller Compensation (cont.) Temp. and Process Tracking

  27. Miller Compensation (cont.)

  28. Load Capacitance Effects

  29. Other Compensation Techniques (cont.)

  30. Other Compensation Techniques (cont.)

  31. Other Compensation Techniques (cont.)

  32. Other Compensation Techniques (cont.)

  33. Slewing in Two-Stage Op Amps Basic Two-Stage Op Amp

  34. Slewing in Two-Stage Op Amp

  35. Slewing with Common-Gate Compensation

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