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Operational Amplifier Circuits - MIT OpenCourseWare
I3 IF N1 Figure 1. Summing amplifier Current conservation at node N1 gives I12+II+=3IF (1.1) By relating the currents I1, I2 and I3 to their corresponding voltage and resistance by Ohm’s law and noting that the voltage at node N1 is zero (ideal op-amp rule) Equation (1.1) becomes 123 123 VVin in Vin Vout R RRRF ++=− (1.2)
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