The present invention discloses pre-amplifier with a selectable threshold voltage in a decision feedback equalization circuit to reduce tap weight variation. A decision feedback equalization circuit includes a summer circuit and a pre-amplifier with an offset generator, wherein the pre-amplifier includes a pair of differential amplifiers and each biased by a respective current bias and each having first and second output nodes coupled to a supply voltage via a respective resistive element, R. The resistive elements may be implemented, for example, using diode-configured transistors, biased transistors, resistor, or any other active or passive circuitry for establishing a resistance. The inputs of first differential amplifier are coupled to the summer's output. The inputs of second differential amplifier are coupled to a reference voltage circuit that comprised of a resistive element and a respective current DAC (IDAC).