Operational amplifier zero adjustment circuit

Published:2011/6/13 5:14:00 Author:Christina | Keyword: Operational amplifier, zero adjustment | From:SeekIC

The common zero adjustment circuit is as shown in the figure. The operational amplifier zero adjustment circuit In figure (a), the potentiometer RP is connected with the internal input differential amplifier stage to change the voltage difference of the collector electrode, by this method, you can adjust the zero point; or you can connect the potentiometer RP2 with the input port of the integrated operational amplifier, let the bias current flow through the RP2 to cause the imbalance of the two input bias currents, so you can adjust the zero point. For some pperational amplifiers with low drift and small input current, you can add a high resistance potentiometer to the collector electrode of the input amplifier stage according to the polarity of the partial zero to make the collector resistance imbalance to change the electric potential difference of the input stage, so the output is zero, as the figure (b) shows. The auxiliaryzero adjustmentcircuit



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