An offset reduction technique for use with CMOS integrated comparators and amplifiers

Methods for reducing the input offset voltage of comparators and amplifiers are reviewed. A comparator that adjusts its own offset either at power-up or in response to a control input is presented. The nature of the offset adjustment is such that the comparator is capable of continuous-time operation. Room-temperature offset in the range of -100 to +100 mu V are achievable. Adjusted offsets exhibit a temperature coefficient on the order of -1 mu V/ degrees C.>