When both inputs are equal, the op-amp is described as

When both inputs are equal, the op-amp is described as

• A. Balanced
• B. Saturated
• C. Oscillating
• D. Nonlinear

Answer: (A)

When the voltages at the two inputs are equal, the differential input voltage is zero. In a feedback configuration, the op-amp adjusts its output to maintain that equality, placing the device in its linear operating region. This situation is described as balanced, since there’s no input error voltage to drive the output toward the rails or into nonlinear behavior. If the inputs weren’t equal, even tiny differences would be amplified by the very large open-loop gain, pushing the output toward saturation; oscillation or nonlinear behavior would require different feedback conditions or circuit configurations. So equal inputs correspond to balanced, linear operation.

When the voltages at the two inputs are equal, the differential input voltage is zero. In a feedback configuration, the op-amp adjusts its output to maintain that equality, placing the device in its linear operating region. This situation is described as balanced, since there’s no input error voltage to drive the output toward the rails or into nonlinear behavior. If the inputs weren’t equal, even tiny differences would be amplified by the very large open-loop gain, pushing the output toward saturation; oscillation or nonlinear behavior would require different feedback conditions or circuit configurations. So equal inputs correspond to balanced, linear operation.