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Introduction to oscillator circuits
This document introduces oscillator circuits. It defines an oscillator as an electronic circuit that produces a repetitive, oscillating electronic signal. There are two main types of electronic oscillators: linear/harmonic oscillators that produce a sinusoidal output and nonlinear/relaxation oscillators that produce a non-sinusoidal output. Several common linear oscillator circuits are described such as the Hartley, Colpitts, Clapp, phase-shift, RC, and cross-coupled LC oscillators. Relaxation oscillator circuits include multivibrators, ring oscillators, and delay line oscillators. Applications of harmonic oscillators include carrier waves in transmitters and changing modulation in radios. Relaxation oscillators are often used as timers
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Introduction to oscillator circuits
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- 2. What is Oscillation? •repetitive variation of some measure about a central value • swinging pendulum an d AC power.
- 3. Electronic Oscillator • Anelectronic circuit that produces a repetitive, oscillating electronic signal. • Oscillators are often characterized by the frequency of their output signal: • Audio • RF • LFO • Oscillators designed to produce a high-power AC output from a DC supply are usually called inverters. • There are two main types of electronic oscillator: the linear or harmonic oscillator and the nonlinear or relaxation oscillator.
- 4. Linear Oscillator • producesa sinusoidal output. • There are two types of linear oscillators: Feedback oscillator Negative resistance oscillator
- 5. Linear Oscillator Circuits •Hartley oscillator • Colpitts oscillator • Clapp oscillator • Phase-shift oscillator • RC oscillator (Wien Bridge and "Twin-T") • Cross-coupled LC oscillator
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- 9. Phase – ShiftOscillator
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- 12. Relaxation oscillator • producesa non-sinusoidal output. • Types of relaxation oscillator circuits include: multivibrator ring oscillator delay line oscillator Royer oscillator rotary traveling wave oscillator
- 13. Applications • Harmonic Oscillator Harmonicoscillators, also known as sine-wave oscillators, are used in transmitters to create carrier waves, waveforms created for the purpose of transmitting information. They are also used in radios as a way of changing the modulation of information-carrying waveforms to allow the device (the radio receiver) to receive and interpret them.
- 14. Applications • Relaxation Oscillator Relaxationoscillators, also known as non- sinusoidal oscillators, are often found in computers and televisions as timers and switches. The jagged waveforms created by relaxation oscillators are caused by abrupt, arrhythmic events, such as the sudden discharge of a capacitor. Variations of this type of oscillator can also be found in strobe lights and electronic camera flashes.
- 15. Applications • Crystal-controlled Oscillator Crystal-controlledoscillators are a form of relaxation oscillator. The distinction between the two is that a crystal-controlled oscillator uses a crystal in place of a standard inductor-capacitor circuit to improve waveform frequency stability. They are used in a number of technical electronic devices, such as MTI radars, wireless base stations, telecom timing modules, satellite terminals and ethernet transceivers.
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