44.3 Input Offset Voltage

Input offset voltage is a measure of the voltage difference between the noninverting and inverting input sources in a closed loop circuit, while the operational amplifier operates in its linear region. The offset voltage will appear as a DC offset in the output equal to the input offset voltage, multiplied by the gain of the circuit. The input offset voltage is also affected by the Common-mode voltage. The OPA module is factory calibrated to minimize the input offset voltage. The offset calibration value can be manually or automatically be adjusted by the user to meet the highest level of accuracy over voltage and temperature. The input offset voltage source can be selected by setting the OFCSEL bits.