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from Part III - Analog: Operational Amplifiers and their Applications
Published online by Cambridge University Press: 18 March 2025
Until now, as we have said in Chapter 8N, we have treated positive feedback as evil or as a mistake: it’s what you get when you get confused about which op-amp terminal you’re feeding. Today you will qualify this view: you will find that positive feedback can be useful: it can improve the performance of a comparator; it can be combined with negative feedback to make an oscillator (“relaxation oscillator”: positive feedback dominates there); or to make a negative impedance converter (this we will not build, but see AoE §4.107, Fig. 4.104: there, negative feedback dominates).
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