When an input signal drives both inputs of an op amp,both inverting and noninverting amplification results and the output is the superposition of two amplified signals.

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When an input signal is applied to both inputs of an op amp, it is known as a differential input. In this case, both inverting and noninverting amplification occurs and the output is the sum of these two amplified signals, also known as the superposition of signals.

When an Input Signal Drives Both Inputs of an Op