Op amp summing amplifier / virtual earth mixer The key change to the inverting amplifier is that several series resistors are added to the virtual earth or virtual ground point formed at the inverting input.The output from any given input can be calculated from the formula below:...
Figure 1 The summing of V1 and V2 is not direct. Resistors R1 and R2 make a weighted sum and this is what makes this amplifier very useful. As in the case with the differential amplifier, one can use this circuit to achieve any linear function. This article shows you how to design a...
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Figure 3 For an ideal Op Amp, we can consider that the input current in the non-inverting input is zero. With this assumption in mind, resistors R1, R2 and R3 make a voltage attenuator, with R2 and R3 in parallel. Therefore Vp is (2) where with R2 || R3 I noted the parallel...