In one embodiment, an apparatus includes an amplifier configured to receive an asymmetric signal. A first resistance is coupled between an input node and an output node of the amplifier. A second resistance is coupled to the input node of the amplifier. A first switch is configured to be controlled during a first interval to couple the second resistance to a positive resistance to increase a gain of the amplifier to correct the asymmetric signal. The gain is a function of the first resistance and a combination of the second resistance and the positive resistance. A second switch is configured to be controlled during a second interval to couple the second resistance to a negative resistance to decrease the gain of the amplifier to correct the asymmetric signal. The gain is a function of the first resistance and a combination of the second resistance and the negative resistance.