Overdrive voltage is the differential voltage produced between the positive and negative inputs of the comparator over the offset voltage (V_IO). To make an accurate comparison, the overdrive voltage (V_OD) must be higher than the input offset voltage (V_IO). Overdrive voltage can also determine the response time of the comparator, with the response time decreasing with increasing overdrive. Figure 9-2 and Figure 9-3 show positive and negative response times with respect to overdrive voltage.