A second op amp can be used to correct for offset error in applications with high gain that need very low offset voltage. An Auto-Zero amplifier uses a second op amp to check for any offset voltage, and then corrects for it. In this way, the lowest offset and drift performance can be achieved. Constantly checking the error voltage is important because it can vary over time and temperature.
 
                 
                 
                 
 
 
 
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