Abstract

A class-AB Miller op-amp with symmetrical and significantly enhanced slew-rate and accurately controlled output quiescent current is introduced. It can drive a wide range of resistive and capacitive loads. The output currents can be a factor 16 times higher than the total op-amp quiescent current. Power-efficient static class-AB operation is achieved by including a simple low-power auxiliary amplifier with resistive local common-mode feedback. It has the small-signal figure of merit FOM <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">SS</inf> of 28 and 27 for R <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">L</inf> =1MΩ and 200Ω.

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