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An electronic oscillation is an electronic circuit that produces a repetitive electronic signal, often a sine wave or a square wave.

A low frequency oscillation (LFO) is an electronic oscillator that generates an alternating current waveform between 0.1 Hz and 10 Hz. This term is typically used in the field of audio synthesizers, to distinguish it from an audio frequency oscillator.

Types of electronic oscillator There are two main types of electronic oscillator: the harmonic oscillator and the relaxation oscillator.

Harmonic oscillator

The harmonic oscillator produces a sinusoidal output. The basic form of a harmonic oscillator is an electronic amplifier with the output attached to a narrow-band electronic filter, and the output of the filter attached to the input of the amplifier. When the power supply to the amplifier is first switched on, the amplifier's output consists only of noise (physics). The noise travels around the loop, being Filter (signal processing) and re-amplified until it increasingly resembles the desired signal.

A piezoelectric crystal (commonly quartz) may be coupled to the filter to stabilise the frequency of oscillation, resulting in a crystal oscillator.

There are many ways to implement harmonic oscillators, because there are different ways to amplify and filter. For example:

• Hartley oscillator
• Colpitts oscillator
• Clapp oscillator
• Pierce oscillator (crystal)
• Phase-shift oscillator
• RC oscillator (Wien bridge oscillator and "Twin-T")
• cross-coupled LC circuit oscillator

Relaxation oscillator The relaxation oscillator is often used to produce a non-sinusoidal output, such as a square wave or sawtooth. The oscillator contains a nonlinear component such as a transistor that periodically discharges the energy stored in a capacitor or inductor, causing abrupt changes in the output waveform.

Square-wave relaxation oscillators can be used to provide the clock signal for sequential logic circuits such as timers and counters, although crystal oscillators are often preferred for their greater stability.

Triangle-wave or sawtooth oscillators are used in the timebase circuits that generate the horizontal deflection signals for cathode ray tubes in analogue oscilloscopes and television sets. In function generators, this triangle wave may then be further shaped into a close approximation of a sine wave.

Other types of relaxation oscillators include the multivibrator and the Time to digital converter.

See also

• Crystal oscillator
• Electronic circuit
• RLC circuit
• Voltage-controlled oscillator
• Injection locked oscillator

External links

• Howstuffworks: oscillator.

An electronic oscillation is an electronic circuit that produces a repetitive electronic signal, often a sine wave or a square wave.

A low frequency oscillation (LFO) is an electronic oscillator that generates an alternating current waveform between 0.1 Hz and 10 Hz. This term is typically used in the field of audio synthesizers, to distinguish it from an audio frequency oscillator.

Types of electronic oscillator There are two main types of electronic oscillator: the harmonic oscillator and the relaxation oscillator.

Harmonic oscillator

The harmonic oscillator produces a sinusoidal output. The basic form of a harmonic oscillator is an electronic amplifier with the output attached to a narrow-band electronic filter, and the output of the filter attached to the input of the amplifier. When the power supply to the amplifier is first switched on, the amplifier's output consists only of noise (physics). The noise travels around the loop, being Filter (signal processing) and re-amplified until it increasingly resembles the desired signal.

A piezoelectric crystal (commonly quartz) may be coupled to the filter to stabilise the frequency of oscillation, resulting in a crystal oscillator.

There are many ways to implement harmonic oscillators, because there are different ways to amplify and filter. For example:

• Hartley oscillator
• Colpitts oscillator
• Clapp oscillator
• Pierce oscillator (crystal)
• Phase-shift oscillator
• RC oscillator (Wien bridge oscillator and "Twin-T")
• cross-coupled LC circuit oscillator

Relaxation oscillator The relaxation oscillator is often used to produce a non-sinusoidal output, such as a square wave or sawtooth. The oscillator contains a nonlinear component such as a transistor that periodically discharges the energy stored in a capacitor or inductor, causing abrupt changes in the output waveform.

Square-wave relaxation oscillators can be used to provide the clock signal for sequential logic circuits such as timers and counters, although crystal oscillators are often preferred for their greater stability.

Triangle-wave or sawtooth oscillators are used in the timebase circuits that generate the horizontal deflection signals for cathode ray tubes in analogue oscilloscopes and television sets. In function generators, this triangle wave may then be further shaped into a close approximation of a sine wave.

Other types of relaxation oscillators include the multivibrator and the Time to digital converter.

See also

• Crystal oscillator
• Electronic circuit
• RLC circuit
• Voltage-controlled oscillator
• Injection locked oscillator

External links

• Howstuffworks: oscillator.

Electronic oscillator - Wikipedia, the free encyclopedia
An electronic oscillator is an electronic circuit that produces a repetitive electronic signal, often a sine wave or a square wave. A low-frequency oscillator (LFO) is an ...

University of Exeter: Attractors of a randomly forced electronic ...
Copyright © 1999 Elsevier. NOTICE: This is the author’s version of a work accepted for publication by Elsevier. Changes resulting from the publishing process, including peer ...

oscillatorguide.com - Electronic Oscillator
Joomla - the dynamic portal engine and content management system, YIG Oscillator, RF Oscillator, Harmonic Oscillator, Crystal Oscillator Circuit, Frequency Oscillator, Transistor ...

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The basic job of an electronic oscillator is to generate an oscillating output. Various outputs can be sine, square, sawtooth, triangle, or complex waveforms.

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... opto-electronic products include an ultra-high performance advanced opto-electronic oscillator (OEO ... Our patented Opto-Electronic Oscillator (OEO) is a fundamentally distinct ...

oscillator, electronic definition of oscillator, electronic in the ...
oscillator, electronic (ŏs`əlā'tər), electronic circuit that produces an output signal of a specific frequency. An oscillator generally consists of an amplifier amplifier ...

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Oscillator circuits are very important in modern electronics. Oscillators are used to generate periodic waveforms. Find manufacturer & supplier's product information about voltage ...

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A crystal oscillator employing a quartz oscillator is an essential component used as the frequency and time reference source in in various types of electronic devices.

INEX: Wikipedia, the free encyclopedia (Electronic oscillator)
Table of Contents. 1 Types of electronic oscillator. 1.1. Harmonic oscillator; 1.2. Relaxation oscillator; 2 See also; An electronic oscillator is an electronic circuit that ...

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Oscillators. The term oscillator is used to describe a circuit which will produce a continuing, repeated waveform without input other than perhaps a trigger.