Advertisement

A Low-Power Ultra-Fast Capacitor-Less LDO with Advanced Dynamic Push-Pull Techniques

  • Xin Ming
  • Ze-kun Zhou
  • Bo Zhang
Conference paper
  • 1.7k Downloads
Part of the IFIP Advances in Information and Communication Technology book series (IFIPAICT, volume 379)

Abstract

A current-efficient, capacitor-less low-dropout regulator (LDO) with fast-transient response for portable applications is presented in this chapter. It makes use of an adaptive biasing common-gate amplifier to extend loop bandwidth of the LDO at heavy loads greatly. Also, the dynamic push-pull (DPP) slew-rate enhancement (SRE) circuit based on capacitive coupling detects rapid voltage spikes at the output to provide an extra current to charge and discharge the large gate capacitance of the power transistor momentarily. The proposed circuit has been implemented in a 0.35μm standard CMOS process. Experimental results show that it can deliver 100mA load current at 150mV dropout voltage. It only consumes 10μA quiescent current at no-load condition and is able to recover within 0.8μs even under the maximum load current change.

Keywords

adaptive biasing dynamic push-pull technique capacitive coupling slew-rate enhancement high bandwidth low-dropout regulator system-on-chips 

References

  1. 1.
    Rincon-Mora, G.A., Allen, P.E.: A low-voltage, low quiescent current, low drop-out regulator. IEEE J. Solid-State Circuits 33(1), 36–44 (1998)CrossRefGoogle Scholar
  2. 2.
    Leung, K.N., Mok, P.K.T.: A capacitor-free CMOS low-dropout regulator with damping-factor-control frequency compensation. IEEE J. Solid-State Circuits 38(10), 1691–1702 (2003)CrossRefGoogle Scholar
  3. 3.
    Lau, S.K., Mok, P.K.T., Leung, K.N.: A low-dropout regulator for SoC with Q-reduction. IEEE J. Solid-State Circuits 42(4), 658–664 (2007)CrossRefGoogle Scholar
  4. 4.
    Man, T.Y., Leung, K.N., Leung, C.Y., Mok, P.K.T., Chan, M.: Development of single-transistor-control LDO based on flipped voltage follower for SoC. IEEE Trans. Circuits Syst. I, Reg. Papers 55(5), 1392–1401 (2008)MathSciNetCrossRefGoogle Scholar
  5. 5.
    Lin, H.-C., Wu, H.-H., Chang, T.-Y.: An active-frequency compensation scheme for CMOS low-dropout regulators with transient-response improvement. IEEE Trans. Circuits Syst. II, Exp. Briefs 55(9), 853–857 (2008)CrossRefGoogle Scholar
  6. 6.
    Ho, M., Leung, K.N., Mak, K.-L.: A low-power fast-transient 90-nm low-dropout regulator with multiple small-gain stages. IEEE J. Solid-State Circuits 45(11), 2466–2475 (2010)Google Scholar
  7. 7.
    Lin, C.-H., Chen, K.-H., Huang, H.-W.: Low-Dropout Regulators With Adaptive Reference Control and Dynamic Push–Pull Techniques for Enhancing Transient Performance. IEEE Trans. Power Electron. 24(4), 1016–1022 (2009)CrossRefGoogle Scholar
  8. 8.
    Lee, H., Mok, P.K.T., Leung, K.N.: Design of low-power analog drivers based on slew-rate enhancement circuits for CMOS low-dropout regulators. IEEE Trans. Circuits Syst. II, Exp. Briefs 52(9), 563–567 (2005)CrossRefGoogle Scholar
  9. 9.
    Hazucha, P., Karnik, T., Bloechel, B.A., Parsons, C., Finan, D., Borkar, S.: Area-efficient linear regulator with ultra-fast load regulation. IEEE J. Solid-State Circuits 40(4), 933–940 (2005)CrossRefGoogle Scholar
  10. 10.
    Al-Shyoukh, M., Lee, H., Perez, R.: A transient-enhanced low-quiescent current low-dropout regulator with buffer impedance attenuation. IEEE J. Solid-State Circuits 42(8), 1732–1742 (2007)CrossRefGoogle Scholar
  11. 11.
    Lam, Y.H., Ki, W.H.: A 0.9 V 0.35 μm adaptively biased CMOS LDO regulator with fast transient response. In: Proc. IEEE Int. Solid-State Circuits Conf., pp. 442–626 (2008)Google Scholar
  12. 12.
    Zhan, C., Ki, W.H.: Output-capacitor-free adaptively biased low-dropout regulator for system-on-chips. IEEE Trans. Circuits and Systems I, Reg. Papers 57(5), 1017–1028 (2010)MathSciNetCrossRefGoogle Scholar
  13. 13.
    Man, T.Y., Mok, P.K.T., Chan, M.: A high slew-rate push-pull output amplifier for low-quiescent current low-dropout regulators with transient-response improvement. IEEE Trans. Circuits Syst. II, Exp. Briefs 54(9), 755–759 (2007)CrossRefGoogle Scholar
  14. 14.
    Or, P.Y., Leung, K.N.: An output-capacitorless low-dropout regulator with direct voltage-spike detection. IEEE J. Solid-State Circuits 45(2), 458–466 (2010)CrossRefGoogle Scholar
  15. 15.
    Guo, J.P., Leung, K.N.: A 6-μW chip-area-efficient output-capacitorless LDO in 90-nm CMOS technology. IEEE J. Solid-State Circuits 45(9), 1896–1905 (2010)MathSciNetCrossRefGoogle Scholar
  16. 16.
    Zheng, C., Ma, D.: Design of monolithic CMOS LDO regulator with D2 coupling and adaptive transmission control for adaptive wireless powered bio-implants. IEEE Trans. Circuits and Systems I, Reg. Papers 58(10), 2377–2387 (2011)MathSciNetCrossRefGoogle Scholar
  17. 17.
    Ho, M., Leung, K.N.: Dynamic bias-current boosting technique for ultralow-power low-dropout regulator in biomedical applications. IEEE Trans. Circuits Syst. II 58(3), 174–178 (2011)CrossRefGoogle Scholar
  18. 18.
    Ho, E.N.Y., Mok, P.K.T.: A capacitor-less CMOS active feedback low-dropout regulator with slew-rate enhancement for portable on-chip application. IEEE Trans. Circuits Syst. II, Exp. Briefs 57(2), 80–84 (2010)CrossRefGoogle Scholar
  19. 19.
    Leung, K.N., Ng, Y.S.: A CMOS low-dropout regulator with a momentarily current-boosting voltage buffer. IEEE Trans. Circuits and Systems I, Reg. Papers 57(9), 2312–2319 (2010)MathSciNetCrossRefGoogle Scholar
  20. 20.
    Milliken, R.J., Silva-Martínez, J., Sánchez-Sinencio, E.: Full on-chip CMOS low-dropout voltage regulator. IEEE Trans. Circuits and Systems I, Reg. Papers 54(9), 1879–1890 (2007)CrossRefGoogle Scholar
  21. 21.
    Ramírez-Angulo, J.: A novel slew-rate enhancement technique for one stage operational amplifiers. In: Proc. IEEE Midwest Symp. Circuits and Systems, Ames, IA, pp. 11–13 (1996)Google Scholar
  22. 22.
    Degrauwe, M.G., Rijmenants, J., Vittoz, E.A., Man, J.J.D.: Adaptive biasing CMOS amplifiers. IEEE J. Solid-State Circuits SC-17(6), 522–528 (1982)CrossRefGoogle Scholar
  23. 23.
    Nagaraj, K.: CMOS amplifiers incorporating a novel slew rate enhancement circuit. In: Proc. IEEE Custom Integrated Circuits Conf., pp. 11.6.1–11.6.5 (1990)Google Scholar
  24. 24.
    Ming, X., Ma, Y.-Q., Zhou, Z.-K., Zhang, B.: A high-precision compensated CMOS bandgap voltage reference without resistors. IEEE Trans. Circuits Syst. II, Exp. Briefs 57(10), 767–771 (2010)CrossRefGoogle Scholar
  25. 25.
    Rincon-Mora, G.A.: Active capacitor multiplier in miller-compensated circuits. IEEE J. Solid-State Circuits 35(1), 26–32 (2000)CrossRefGoogle Scholar

Copyright information

© IFIP International Federation for Information Processing 2012

Authors and Affiliations

  • Xin Ming
    • 1
  • Ze-kun Zhou
    • 1
  • Bo Zhang
    • 1
  1. 1.State Key Laboratory of Electronic Thin Films and Integrated DevicesUniversity of Electronic Science and Technology of ChinaChengduChina

Personalised recommendations