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**TL;DR Summary:**Build a circuit of given operation on voltages

I'll appreciate any help.

I need to create circuit of this operation on three voltages:

We'll use circuit of voltages summer:

The third term is the integral of U_3, so we'll use integrator:

Than, calculate capacitance:

And on this step we have negative capacitance. Is it possible? Or I did something wrong?

Next, we calculate R_1, R_2.

And here we have -44 kilo Ohm for R_2.