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A Low-Power High-Speed Class-AB Buffer Amplifier for Flat-Panel-Display Application

國立彰化師範大學　 積體電路設計研究所. A Low-Power High-Speed Class-AB Buffer Amplifier for Flat-Panel-Display Application. 研究生：賴信吉 Email ： s94662005@mail.ncue.edu.tw 指導教授：林志明 老師. IEEE TRANSACTIONS ON VERY LARGE INTEGRATION (VLSI) SYSTEMS, VOL. 10, NO. 2, APRIL 2002. Outline. Introduction

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A Low-Power High-Speed Class-AB Buffer Amplifier for Flat-Panel-Display Application

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  1. 國立彰化師範大學　 積體電路設計研究所 A Low-Power High-Speed Class-AB Buffer Amplifier for Flat-Panel-Display Application 研究生：賴信吉 Email：s94662005@mail.ncue.edu.tw 指導教授：林志明 老師 IEEE TRANSACTIONS ON VERY LARGE INTEGRATION (VLSI) SYSTEMS, VOL. 10, NO. 2, APRIL 2002

  2. Outline • Introduction • The proposed class-AB buffer • Evaluation of power consumption • Experimental results • Conclusion • References

  3. Conventional Amplifier From[1] Introduction

  4. It employs an elegant comparator to sense the transients of the input to turn on charging/discharging transistors. • This increases the speed of the circuit without increasing too much static-power consumption. • A wide input voltage range and a large output swing.

  5. The proposed class-AB buffer ↓I ↓I/2 ↓I/2 ↓I/2

  6. The simulated responses of the outputs of the conventional amplifier and the proposed buffer amplifier, which are loaded with a large-size capacitor of 680 pF, with a square-wave input.

  7. Evaluation of power consumption • The static dissipation, dynamic dissipation, • direct-path dissipation. static dissipation ----------------------------------------------------------------------------- dynamic dissipation

  8. direct-path dissipation ----------------------------------------------------------------------------- -----------------------------------------------------------------------------

  9. (a) (b) (a) The maximum power consumption versus the scanning frequencies for a 3.5-V output voltage swing (0.5~4 V) for the charging step. (b) The maximum power consumption versus the scanning frequency for a 3.5-V output voltage swing (0.5~4 V) for the discharging step.

  10. 97.8KHz scanning • It can be seen that the power dissipation depends on the output voltage swing.

  11. TSMC 0.6-um CMOS technology

  12. Experimental results ←Output ←Input Under a 100 KHz triangular input waveform of an amplitude of 1 V to 4.17 V under a 680 pF capacitance load.

  13. 1.6µ s • Input • Output 1.0µ s With a 100-KHz square wave input under a 680 pF capacitance load.

  14. Conclusion • A large-size capacitor of 680 pF with the input of a step-wise (0.5~4 V) for a 97.8 KHz scanning frequency, are only 1m and 0.893 mW for charging and discharging. • The circuit draws 30 µ A static current and exhibited settling times of 1.6 µ s and 1 µ s for rise and fall edges.

  15. advantage • a low-power consumption, high speed, large output swing, and wide-input-voltage range. • It is very suitable for the application in the flat panel as the display driver.

  16. References [1] C.-W. Lu and C. L. Lee, “A low power high speed class-AB buffer amplifier for flat panel display application,”IEEE Trans. VLSI Syst., vol. 10, pp. 163–168, Apr. 2002. [2] P.-C. Yu and J.-C. Wu, “A Class-B output buffer for flat-panel-display column driver,” IEEE J. Solid-State Circuits, vol. 34, pp. 116–119, Jan. 1999.

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