To adjust the output offset voltage of an op-amp, connect circuit inputs to

To adjust the output offset voltage of an op-amp, connect circuit inputs to

• A. Ground directly
• B. Power supply
• C. Circuit common
• D. Output node

Answer: (C)

To null or adjust the output offset, you want the two input terminals to sit at the same potential so any remaining output is due only to the offset voltage inside the amplifier. Tying both inputs to the circuit common provides that common reference point, making the input differential effectively zero. With both inputs at the same level, you can use offset-trim provisions (if present) to dial the output back to zero. If you connect an input to the power supply, the inputs aren’t forced to be equal and the amplifier may drive to a rail or behave unpredictably. Connecting to the output node would disturb the feedback behavior and won’t set the inputs equal. Grounding both inputs works if ground is the same as the circuit’s common reference, but the intended and reliable practice is to use the circuit common, which is the designated reference for offset adjustment.

To null or adjust the output offset, you want the two input terminals to sit at the same potential so any remaining output is due only to the offset voltage inside the amplifier. Tying both inputs to the circuit common provides that common reference point, making the input differential effectively zero. With both inputs at the same level, you can use offset-trim provisions (if present) to dial the output back to zero.

If you connect an input to the power supply, the inputs aren’t forced to be equal and the amplifier may drive to a rail or behave unpredictably. Connecting to the output node would disturb the feedback behavior and won’t set the inputs equal. Grounding both inputs works if ground is the same as the circuit’s common reference, but the intended and reliable practice is to use the circuit common, which is the designated reference for offset adjustment.