7. (8%) Try to design a summing circuit with ONE Op-amp and some necessary resistances, make that $U_o = U_{i1} - 2U_{i2} - 3U_{i3} + 4U_{i4}$, $R_f = 30K$ (Please write the design process clearly, and draw the circuit, mark the values of resistances.)
Added by Edward H.
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From the given equation Uo = U1 - 2Ui2 - 3Ui + 4Ui4, we can see that we need four input voltages: U1, Ui2, Ui, and Ui4. The coefficients for each input are 1, -2, -3, and 4 respectively. Show more…
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