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In order to ensure that  the output voltage of an opamp is zero, when both its inputs are grounded

In order to ensure that  the output voltage of an opamp is zero, when both its inputs are grounded Correct Answer an external offset balancing circuit is used at the input terminals

Explanation:

1) In the case of the ideal op-amp, the DC voltage of the V1 and V2 terminals match exactly when the input voltage (Vi) is 0 V. In reality, however, there are differences in input impedance and input bias current between the V1 and V2 terminals, causing a slight difference in their voltages.

2) This difference called input offset voltage is multiplied by a gain, appearing as an output voltage deviation from the ideal value.

Case 1:

1) Op-amp is a direct-coupled device with large DC gain.

2) The output of op-amp will not be zero even if both inputs are grounded. This is called output offset voltage or Error voltage.

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Case 2:

1) When used in amplifiers of sensors, etc., the input offset voltage of op-amp results in an error of sensor detection sensitivity.

2) To keep sensing errors below a specified tolerance level, it is necessary to select an op-amp with low input offset voltage.

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