Consider the summing op-amp in Figure 9.40. Let RF = 80kΩ R1 = 40kΩ, R2 = 20kΩ, RA = RB = 50kΩ, and Rc = 100kΩ. (a) Determine the output voltage in terms of the input voltages, (b) Determine υ0 for (i) υI1 = 0.1 V, υI 2 = 0.15 V, υI 3 = 0.2 V, υI4 = 0.3 V; and for (ii) υI 1 = −0.2 V, υ I2 = 0.25 V, υI 3 = −0.1 V, υI4 = 0.2 V.
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