A model of op-amp circuits

In stability analysis, op-amp circuits are often modeled as single-loop feedback systems, as shown with a finite open-loop gain A in the forward path and beta in the feedback path. The author proposes a different model that has two feedback loops. The model is useful in stability of op-amp circuits and in determining the oscillation conditions of Wien-bridge oscillators. The model has one positive feedback loop and one negative loop. The model is easy to develop and offers better insight into op-amp circuits than the single-loop model.<
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