a driver system , a driver calibration circuit arrangement for calibration of an impedance of a driver circuit arrangement , and a method for calibration of an impedance of a driver circuit arrangement can achieve improved driver behavior , with respect to undesirable distortions of the slew rate caused by off - chip drivers of ddr memory modules . a driver system has a first driver part with at least one variable impedance by which an operating point of the first driver part is determined with respect to a first potential and a second potential . the potentials supply the first driver part . a first monitoring device adjusts an impedance value of the variable impedance such that the operating point differs from a mid - point of the first and of the second potential .