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College of Engineering Pune [hello From the above equation following conclusions can be made:

   Output is proportional to the time derivative of the input. Hence opamp acts as a differentiator.
   The minus sign indicates the phase difference of 180 degrees between the output and the input.
   Above equation is true for any frequency signal.
   If we select R and C in such a manner that R×C=1 then the above equation becomes

   V_{\text{out}} = -\frac{dV_{\text{in}}}{dt}

Here output is nothing but the time derivative of the input. Such differentiator is called as a perfect differentiator.