6.2.3 Mathematical Operations

Chapter 6.2.3 Mathematical Operations

Physics Lecture Notes – Phys 395 Electronics Book
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Physics Lecture Notes – Phys 395 Electronics Book

  • CHAPTER 6. OPERATIONAL AMPLIFIERS110RBRFRIFigure 6.6: Inverting amplifier with bias compensation.6.2.3Mathematical OperationsCurrent Summing AmplifierConsider the current-to-voltage converter shown in figure 6.7. Applying our ideal amplifierrules givesRFVoutVinFigure 6.7: Current-to-voltage converter.V+ = V− =0⇒ 0− Vout = IRF .(6.15)Therefore Vout =−IRF and the circuit acts as a current-to-voltage converter.Figure 6.8 shows several current sources driving the negative input of an inverting am-plifier. Summing the current into the node givesRFR3R2R1V3V2V1VoutFigure 6.8: Current summing amplifier.