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Chapter 16 Oscillator Circuits and Applications

- 441 - Chapter 16 Oscillator Circuits and Applications _____ Introduction Oscillator contains circuit that generates an output signal without necessity of an input signal. It is a circuit that produces a repetitive waveform on its output with only dc supply as input. The Oscillator can be sinusoidal or non-sinusoidal type. They can be used in many Applications such as communication and digital system. Oscillator operation is based on positive feedback whereby portion of the output signal Vout is feedback without phase change.

16.3.2 Operational Amplifier Phase-Shift Oscillator The operational amplifier phase-shift oscillator is another oscillator type that meets the principles of oscillator design. Its circuit is shown in Fig. 16.10. Figure 16.10: Operational amplifier phase-shift oscillator The feedback portion of the oscillator can be derived by applying Kirchhoff’s

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