In an analog buffer and a method for driving the same, by providing a pair of switches at a last comparing unit, a voltage level of an output signal is precharged as high as a source voltage level during a first offset period in an Nth initializing period, the voltage level of the output signal is discharged as high as a voltage level of a desired data signal during a discharging period in an Nth signal-applied period, then, the discharged voltage of the output signal, which overshoots a desired data voltage is compensated during a second offset period in the Nth signal-applied period to thereby output an accurate data voltage. In addition, by providing the pair of switches at the last comparing unit, a voltage level of an output signal is discharged to a ground potential during a first offset period in an N+1th initializing period, the voltage level of the output signal is charged as high as a voltage level of the desired data signal during a charging period of an N+1th signal-applied period, then the charged voltage of the output signal, which overshoots a desired data voltage, is compensated during a second offset period to thereby output an accurate data voltage. Accordingly, by the analog buffer and the method for driving the same, a flat panel display device driven by an inversion method can correctly implement a desired color, and thus its image quality can be improved.