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Operational Amplifier Circuits - MIT OpenCourseWare
ocw.mit.edu“operational” circuits. Summing Amplifier A basic summing amplifier circuit with three input signals is shown on Figure 1. R1 RF Vin2 Vout R2 R3 Vin1 Vin3 I1 I2 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