Wide common mode input range, gain tunable sense amplifier with system self-calibration

This paper presents a technique to sense and amplify small differential signal with tunable gain from 10 to 100. This amplifier can work with wide common mode input voltage ranges from -7 V to 90 V. One offset cancellation block is introduced, in order to realize system self-calibration which is possible to reduce equivalent input offset voltage to less than 0.5 mV.