Operational Amplifier Practice Test

If the input voltages of an op-amp are identical and the output voltage is 0Vdc. The op-amp is

Saturated Linear Balanced Unbalanced

Correct Answer:

Balanced

Explanation:

When the input voltages of an op-amp are identical, the differential input voltage is zero. In an ideal op-amp, the output is proportional to this difference, so zero difference means the output sits at zero volts, provided the device is not driven into saturation by offset errors. This situation is described as the op-amp being balanced: the two inputs are at the same potential, so there is no differential drive pushing the output away from a harmless, linear operating point. The given scenario—inputs equal and output at 0 V—fits perfectly with a balanced, linear condition. If the output were at a supply rail, that would indicate saturation, and if the inputs differed, the device wouldn’t be balanced.

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