Local oscillator

Local oscillator

A local oscillator is an electronic device used to generate a signal normally for the purpose of converting a signal of interest to a different frequency using a mixer. This process of frequency conversion, also referred to as heterodyning, produces the sum and difference (with the utilization of trigonometric angle sum and difference identities) of the local oscillator and input signal of interest. These are the beat frequencies. Normally the beat frequency is associated with the lower sideband, the difference between the two.

Several local oscillators can be strung in series to form a local oscillator chain (LO chain).

Historically, most applications of local oscillators were widely used in radio physics over frequencies from kHz to GHz. After spreading of nonlinear optics, the same terms and principles apply also to the optical frequencies of order of10^{15}Hz.

See also

*Superheterodyne receiver
*Direct conversion receiver
*Homodyne detection
*Heterodyne detection
*Autogenerator


Wikimedia Foundation. 2010.

Игры ⚽ Поможем решить контрольную работу

Look at other dictionaries:

  • local oscillator — vietinis generatorius statusas T sritis automatika atitikmenys: angl. local oscillator vok. Überlagerer, m; Überlagerungsoscillator, m rus. местный генератор, m pranc. oscillateur local, m …   Automatikos terminų žodynas

  • local oscillator — noun an oscillator whose output heterodynes with the incoming radio signal to produce sum and difference tones • Syn: ↑heterodyne oscillator • Hypernyms: ↑oscillator • Part Holonyms: ↑heterodyne receiver, ↑superheterodyne receiver, ↑ …   Useful english dictionary

  • local oscillator — /loʊkəl ˈɒsəleɪtə/ (say lohkuhl osuhlaytuh) noun an oscillator in a receiver, whose output is mixed with a signal borne by a carrier wave in order to change to a new carrier frequency …  

  • oscillator — noun generator that produces sonic oscillations or alternating current (Freq. 1) • Hypernyms: ↑generator • Hyponyms: ↑crystal oscillator, ↑quartz oscillator, ↑local oscillator, ↑heterodyne oscillator …   Useful english dictionary

  • Local Interconnect Network — The LIN Bus (Local Interconnect Network) is a computer networking bus system used within current automotive network architectures.The LIN specification is enforced by the LIN consortium, with the first exploited version being 1.1, released in… …   Wikipedia

  • Parametric oscillator — A parametric oscillator is a simple harmonic oscillator whose parameters (its resonance frequency omega and damping eta) vary in time in a defined wayAnother intuitive way of understanding a parametric oscillator is as follows: a parametric… …   Wikipedia

  • Blocking oscillator — A blocking oscillator is the minimal configuration of discrete electronic components which can produce a free running signal, requiring only a capacitor, transformer, and one amplifying component. The name is derived from the fact that the… …   Wikipedia

  • heterodyne oscillator — noun an oscillator whose output heterodynes with the incoming radio signal to produce sum and difference tones • Syn: ↑local oscillator • Hypernyms: ↑oscillator • Part Holonyms: ↑heterodyne receiver, ↑superheterodyne receiver, ↑sup …   Useful english dictionary

  • oscillateur local — vietinis generatorius statusas T sritis automatika atitikmenys: angl. local oscillator vok. Überlagerer, m; Überlagerungsoscillator, m rus. местный генератор, m pranc. oscillateur local, m …   Automatikos terminų žodynas

  • Crystal oscillator — A miniature 4 MHz quartz crystal enclosed in a hermetically sealed HC 49/US package, used as the resonator in a crystal oscillator. A crystal oscillator is an electronic oscillator circuit that uses the mechanical resonance of a vibrating crystal …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”