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Op Amps for Everyone, 3rd Edition by Bruce Carter

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Chapter 19. Sine Wave Oscillators
Ron Mancini and Richard Palmer
19.1. What Is a Sine Wave Oscillator?
Op amp oscillators are circuits that are unstable—not the type that are sometimes unintentionally designed or created in the lab, but circuits intentionally designed to remain in an unstable state. Oscillators are useful for creating uniform signals that are used as a reference in applications such as audio, function generators, digital systems, and communication systems.
Two general classes of oscillators exist: sinusoidal and relaxation. Sinusoidal oscillators consist of amplifiers with RC (resistance/capitance) or LC (inductance/capitance) circuits that have adjustable oscillation frequencies or crystals that have a fixed oscillation frequency. ...

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