An analog buffer includes a first switch and a first capacitor for receiving an analog signal, a comparing unit for compensating a voltage change of an output signal applied to a line upon receiving the analog signal through the first switch and the first capacitor, a second switch connected across an input terminal and an output terminal of the comparing unit, a third switch connected across the comparing unit, the first switch and the first capacitor and a fourth switch connected between the output terminal of the comparing unit and the line.