Chapter 24
Other Applications
Abstract
There are many op amp applications that fall outside the arena of gain, offset, and filtering. These include oscillators and power boosters.
Keywords
Oscillator; Power booster
24.1. Op Amp Oscillators
When talking about op amp oscillators, a designer needs to unlearn everything they have previously learned about op amp stability criteria—in other words, they now want to purposely design a circuit which, by its very nature, is unstable.
At this point, this volume could launch back into the theory of feedback design, but to get to the point—the best way of making an op amp unstable is to use positive, not negative, feedback. Negative feedback as used up to this point has operated to limit output voltage excursions ...
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