The present invention relates to an electronic circuit design technology, and more particularly to an amplifier design technology, and more particularly to a slew rate automatic correction class AB amplifier. An object of the present invention is to provide a class AB amplifier capable of minimizing power consumption by correcting an amount of current and a slew rate according to the size of an input pulse. In the present invention, the main driver for driving the output stage of the class AB amplifier is designed to be small, and an input pulse magnitude sensing unit for turning on / off the auxiliary driver according to the magnitude of the auxiliary driver and the input pulse is added. In this case, if the size of the input pulse is small, the auxiliary driver is turned off and the output terminal is driven only by the small main driver to reduce unnecessary current consumption. If the size of the input pulse is large, the auxiliary driver is turned on to increase the slew rate of the output signal within the desired time. Allow sampling.;AB amplifier, slew rate, auto compensation, input pulse amplitude, current consumption
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