Embodiments relate to reducing offset error in sensor systems. In embodiments, the sensitivity and offset of a sensor depend differently on some parameter, e.g. voltage, such that operating the sensor at two different values of the parameter can cancel the offset error. Embodiments can have applicability to stress sensors, Hall plates, vertical Hall devices, magnetoresistive sensors and others. The offset error can be reduced using a correction factor based on a first offset error of the sensor system when operated in a first phase and a second offset error of the sensor system when operated in second first phase. The sensor system can generate an output signal based on first and second output signals generated when operating in the first and second phases, respectively.