Working

Working of an Operational Amplifier

In the basic operation of the op-amp, first, we assume that there is a portion of the output that is fed back to the inverting terminal so that we can achieve the fixed gain for the amplifier. This is term as negative feedback. If the magnitude of this differential voltage is more positive on the inverting (-) terminal as compared to the noninverting (+) terminal, the output will be more negative. If the magnitude of the differential voltage is more positive on the noninverting (+) terminal as compared to the inverting (-) terminal, the output voltage will become more positive. The open-loop gain of the amplifier will force the differential voltage to zero. As long as the input and output stay in the operational range of the amplifier, it will make the differential voltage at zero, and the output will be a multiplication of input voltage by the gain set by the feedback.