Consider an ideal summing amplifier as shown in Figure 9.14(a) with R1 , = 20 kΩ, R2 = 40kΩ, R3 = 50 kΩ, and RF = 200 kΩ. Determine the output voltage υ0 for (a) υI1 = −0.25 mV, υI 2 = +0.30 mV, υI3 =−0.50 mV; and (b) υI1 = +10 mV, υI2 = −40 mV, υI3 = +25 mV.
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