(a) Design an ideal inverting summing amplifier to produce an output voltage of υO = −2.5(1.2υI1 +2.5υI2 + 0.25υI3). Design the circuit to produce the largest possible input resistance, assuming the largest resistance in the circuit is limited to 400 kΩ. (b) Using the results of part (a), determine the current in the feedback resistor for υI1 = −1.0 V,υI2 = +0.25 V, and υI3 = +2V.
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