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Transcript
Measuring Input Offset Voltage Measure the voltage between Vref and Vout. Input Offset Voltage = (Vref to Vout) / ((R7/R8) + 1) = (Vref to Vout) / 101 Alternatively, with this circuit configuration, the Input Offset Voltage can be measured between the input terminals of the op amp. R9 & R10 eliminate any offset at the output due to Input Bias Currents therefore any offset at the output is due solely to the Input Offset Voltage. R9//R10 = R7//R8. Measuring Input Bias Currents Ibias- = (Voltage across R3) / 1M Ibias+ = (Voltage across R4) / 1M Input Offset Current = |(Ibias+) - (Ibias-)| The polarity of the voltages across the 1M resistors indicates the direction of the Input Bias Currents that is to say whether the input stage uses NPN or PNP transistors.
