AFFC and DLPC

1. Project AFFC and DLPC WEI-HAO LIN APR, 6, 2005 指導教授 : 黃柏鈞 教授

2. Outline • Introduction of AFFC • Structure of AFFC • Introduction of DLPC • Structure of DLPC • Comparison

3. Outline • Introduction of AFFC • Structure of AFFC • Introduction of DLPC • Structure of DLPC • Comparison

4. Introduction of AFFC(Hoi Lee, and Philip K. T. Mok, Active-Feedback Frequency Compensation ,2003) • Solve the problem of using passive feedback • Using active feedback • Introduce a LHP zero

5. Outline • Introduction of AFFC • Structure of AFFC • Introduction of DLPC • Structure of DLPC • Comparison

6. Structure of AFFC • Two part – HGB and HSB • HSB bypass high frequency and active-feedback with Ca forms a LHP zero • Transfer function :

7. Structure of AFFC To meet PM =60 and better transient performance => Close loop function:

8. Structure of AFFC Transistor level:

9. Structure of AFFC with DFS (Hoi Lee, and Philip K. T. Mok, Advances in Active-Feedback Frequency Compensation With Power Optimization and Transient Improvement,2004) Transient Behavior Transistor level: Comparison:

10. Outline • Introduction of AFFC • Structure of AFFC • Introduction of DLPC • Structure of DLPC • Comparison

11. Introduction of DLPC(Hoi Lee, Ka Nang Leung and Philip K. T. Mok, A Dual-Path Bandwidth Extension Amplifier Topology with Dual-Loop parallel Compensation ,2003) • Solve the problem of using passive feedback • Using dual feedback loop

12. Outline • Introduction of AFFC • Structure of AFFC • Introduction of DLPC • Structure of DLPC • Comparison

13. Structure of DLPC • Two High-Speed path • Path 2 is a DFC circuit

14. Structure of AFFC To meet PM =60 and better transient performance =>

15. Structure of AFFC Transistor level: Biased Circuit

16. Outline • Introduction of AFFC • Structure of AFFC • Introduction of DLPC • Structure of DLPC • Comparison

17. Comparison