Journal of Low Power Electronics and Applications (Jul 2021)

Implementation of Power-Efficient Class AB Miller Amplifiers Using Resistive Local Common-Mode Feedback

  • Anindita Paul,
  • Mario Renteria-Pinon,
  • Jaime Ramirez-Angulo,
  • Ricardo Bolaños-Pérez,
  • Héctor Vázquez-Leal,
  • Jesús Huerta-Chua,
  • Alejandro Diaz-Sánchez

DOI
https://doi.org/10.3390/jlpea11030031
Journal volume & issue
Vol. 11, no. 3
p. 31

Abstract

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An approach to implement single-ended power-efficient static class-AB Miller op-amps with symmetrical and significantly enhanced slew-rate and accurately controlled output quiescent current is introduced. The proposed op-amp can drive a wide range of resistive and capacitive loads. The output positive and negative currents can be much higher than the total op-amp quiescent current. The enhanced performance is achieved by utilizing a simple low-power auxiliary amplifier with resistive local common-mode feedback that increases the quiescent power dissipation by less than 10%. The proposed class AB op-amp is characterized by significantly enhanced large-signal dynamic, static current efficiency, and small-signal figures of merits. The dynamic current efficiency is 15.6 higher, the static current efficiency is 10.6 times higher, and the small-signal figure of merit is 2.3 times higher than the conventional class-A op-amp. A global figure of merit that determines an op-amp’s ultimate speed is 6.33 times higher than the conventional class A op-amp.

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