The goal of the first section will be to present the general function of the differentiator op-amp and we will of course also demonstrate and explain its output formula. When the position of the capacitor is inversed, that is to say, that the feedback branch becomes resistive and the input branch reactive, a new configuration commonly known as a differentiator emerges. Indeed, the presence of a capacitor in the feedback loop constitutes the main aspect of integrators, which perform electrically the mathematical operation of integration. In our previous article about the Integrator op-amp, we have seen that the implementation of a reactive component significantly changes the electrical behavior of OPAMPs in comparison to fully-based resistive designs.
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