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A Power-Efficient CMOS Adaptive Biasing Operational Transconductance Amplifier

  • Torfifard, Jafar (Faculty of Electrical Engineering, University of Technology Malaysia) ;
  • A'ain, Abu Khari Bin (Faculty of Electrical Engineering, University of Technology Malaysia)
  • Received : 2012.05.14
  • Accepted : 2012.08.27
  • Published : 2013.04.01

Abstract

This paper presents a two-stage power-efficient class-AB operational transconductance amplifier (OTA) based on an adaptive biasing circuit suited to low-power dissipation and low-voltage operation. The OTA shows significant improvements in driving capability and power dissipation owing to the novel adaptive biasing circuit. The OTA dissipates only $0.4{\mu}W$ from a supply voltage of ${\pm}0.6V$ and exhibits excellent high driving, which results in a slew rate improvement of more than 250 times that of the conventional class-AB amplifier. The design is fabricated using $0.18-{\mu}m$ CMOS technology.

References

  1. Y.P. Tsividis, Operation and Modeling of the MOS Transistor, 2nd ed., New York: Oxford University Press, Inc., 1999.
  2. M.G. Degrauwe et al., "Adaptive Biasing CMOS Amplifiers," IEEE J. Solid State Circuits, vol. 17, no. 3, June 1982, pp.522-528. https://doi.org/10.1109/JSSC.1982.1051769
  3. A.J. López-Martín et al., "Low-Voltage Super Class AB CMOS OTA Cells with Very High Slew Rate and Power Efficiency," IEEE J. Solid State Circuits, vol. 40, no. 5, May 2005, pp. 1068-1077. https://doi.org/10.1109/JSSC.2005.845977
  4. J.A. Galan et al., "Super Class-AB OTAs with Adaptive Biasing and Dynamic Output Current Scaling," IEEE Trans. Circuits Syst. I, vol. 54, no. 3, Mar. 2007, pp. 449-457. https://doi.org/10.1109/TCSI.2006.887639
  5. R. Castello and P.R. Gray, "A High-Performance Micropower Switched-Capacitor Filter," IEEE J. Solid State Circuits, vol. 20, no. 6 , Dec. 1985, pp. 1122-1132. https://doi.org/10.1109/JSSC.1985.1052449
  6. G. Xing, S.H. Lewis, and T.R. Viswanathan, "Self-Biased Unity- Gain Buffers with Low Gain Error," IEEE Trans. Circuits Syst. II, vol. 56, no. 1, Jan. 2009, pp. 36-40. https://doi.org/10.1109/TCSII.2008.2010162
  7. P.R. Surkanti and P.M. Furth, "Converting a Three-Stage Pseudoclass-AB Amplifier to a True-Class-AB Amplifier," IEEE Trans. Circuits Syst. II, vol. 59, no. 4, Apr. 2012, pp. 229-233.
  8. V. Dhanasekaran, J. Silva-Martinez, and E. Sánchez-Sinenco, "Design of Three-Stage Class-AB 16 $\Omega$ Headphone Driver Capable of Handling Wide Range of Load Capacitance," IEEE J. Solid State Circuits, vol. 44, no. 6, June 2009, pp. 1734-1744. https://doi.org/10.1109/JSSC.2009.2020461
  9. W.S. Wu et al., "Digital-Compatible High-Performance Operational Amplifier with Rail-to-Rail Input and Output Ranges," IEEE J. Solid State Circuits, vol. 29, no. 1, Jan. 1994, pp. 63-66. https://doi.org/10.1109/4.272096
  10. R. Hogervorst et al., "A Compact Power-Efficient 3 V CMOS Rail-to-Rail Input/Output Operational Amplifier for VLSI Cell Libraries," IEEE J. Solid State Circuits, vol. 29, no. 12, Dec. 1994, pp. 1505-1513. https://doi.org/10.1109/4.340424
  11. S. Solıs-Bustos et al., "A 60-dB Dynamic-Range CMOS Sixth- Order 2.4-Hz Low-Pass Filter for Medical Applications," IEEE Trans. Circuits Syst. II: Analog Digit. Signal Process., vol. 47, no. 12 , Dec. 2000, pp. 1391-1398. https://doi.org/10.1109/82.899631