A Power-Efficient CMOS Adaptive Biasing Operational Transconductance Amplifier

ETRI Journal

关键词: low voltage;    low power;    class-AB amplifiers;    CMOS operational transconductance amplifier (OTA);    Adaptive biasing;   

Others  :  1196718
DOI  :  10.4218/etrij.13.0112.0300

【 摘 要 】

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 µW from a supply voltage of ±0.6 V 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-µm CMOS technology.

   

【 参考文献 】

• [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.
• [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.
• [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.
• [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.
• [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.
• [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 Ω Headphone Driver Capable of Handling Wide Range of Load Capacitance," IEEE J. Solid State Circuits, vol. 44, no. 6, June 2009, pp. 1734-1744.
• [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.
• [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.
• [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.