Consider the ideal inverting summing amplifier in Figure 9.14(a) with parameters R1 = 40 kΩ, R2 = 20 kΩ, R3 = 60 kΩ, and RF = 120 kΩ.
(a) Determine vO for υI1 = −0.25 V, υI2 = +0.10 V, and υI3 = +1.5 V.
(b) Determine υI1 , for υI2 = +0.25 V, υI3 = − 1.2 V, and υO = +0.50 V.
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