local oscillator: meaning, definition, pronunciation and examples
C2Technical
Quick answer
What does “local oscillator” mean?
A small, internal electronic oscillator within a receiver or transmitter used to generate a specific frequency for signal mixing.
Audio
Pronunciation
Definition
Meaning and Definition
A small, internal electronic oscillator within a receiver or transmitter used to generate a specific frequency for signal mixing.
In radio frequency (RF) systems, the LO generates a signal that is combined with an incoming signal to convert it to a fixed intermediate frequency (IF) or to a different transmission frequency. Its stability and purity are critical for system performance.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Both regions use the same term. Potential minor spelling differences in related documentation (e.g., 'oscillise' vs. 'oscillize' are not standard; the base term is identical).
Connotations
Purely technical with no regional connotative differences.
Frequency
Equally low-frequency outside specialised technical fields in both regions.
Grammar
How to Use “local oscillator” in a Sentence
The [adjective] local oscillator [verb]...To [verb] the local oscillator...[Noun] relies on a stable local oscillator.Vocabulary
Collocations
Examples
Examples of “local oscillator” in a Sentence
verb
British English
- The system is designed to heterodyne the signal using a locally generated reference.
American English
- The circuit mixes the incoming RF with the signal generated by the local oscillator.
adjective
British English
- The local-oscillator stability was paramount.
American English
- We observed a local-oscillator spur at 2.4 GHz.
Usage
Meaning in Context
Business
Rare, except in procurement contexts for RF components: 'The contract specifies the phase noise requirements for the local oscillator.'
Academic
Common in physics, electrical engineering, and telecommunications papers: 'The experiment's sensitivity was limited by phase noise in the local oscillator.'
Everyday
Virtually never used.
Technical
Core term in RF engineering, radar, satellite communications, and radio astronomy: 'Local oscillator leakage can cause self-interference in the receiver front-end.'
Vocabulary
Synonyms of “local oscillator”
Strong
Neutral
Weak
Vocabulary
Antonyms of “local oscillator”
Watch out
Common Mistakes When Using “local oscillator”
- Pronouncing 'oscillator' with a hard 'c' (like 'osc-ill-ator' instead of 'oss-ill-ator').
- Using 'local oscillator' to refer to any oscillator in a device (it specifically refers to the one used for frequency conversion).
- Misspelling as 'local oscillater'.
FAQ
Frequently Asked Questions
Yes, 'LO' is the standard and universally understood abbreviation for 'local oscillator' in technical schematics, datasheets, and engineering discussions.
Yes, advanced systems like software-defined radios (SDRs) or multi-band receivers may use multiple local oscillators for different frequency bands or stages of conversion.
A VCO is a type of oscillator whose output frequency is controlled by an input voltage. A local oscillator is a functional role within a circuit; it can be implemented using a VCO, a crystal oscillator, or other types.
LO leakage refers to the LO signal unintentionally radiating from or within the device. It can interfere with other receivers, create a DC offset in the mixer, or act as a security vulnerability by revealing the operating frequency.
A small, internal electronic oscillator within a receiver or transmitter used to generate a specific frequency for signal mixing.
Local oscillator is usually technical in register.
Local oscillator: in British English it is pronounced /ˈləʊkəl ˈɒsɪleɪtə/, and in American English it is pronounced /ˈloʊkəl ˈɑːsəleɪtər/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think of a LOCAL radio station (oscillator) inside your receiver that you MIX with the incoming distant signal to get a clear, fixed frequency you can work with.
Conceptual Metaphor
A DANCING PARTNER for the incoming signal. The incoming signal (Partner A) is mixed with the local oscillator's signal (Partner B) to create a new, easier-to-handle signal (the dance result).
Practice
Quiz
What is the primary function of a local oscillator in a receiver?