Injection locking (original) (raw)
Injection locking and injection pulling are the frequency effects that can occur when a harmonic oscillator is disturbed by a second oscillator operating at a nearby frequency. When the coupling is strong enough and the frequencies near enough, the second oscillator can capture the first oscillator, causing it to have essentially identical frequency as the second. This is injection locking. When the second oscillator merely disturbs the first but does not capture it, the effect is called injection pulling. Injection locking and pulling effects are observed in numerous types of physical systems, however the terms are most often associated with electronic oscillators or laser resonators.
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| dbo:abstract | Injection locking and injection pulling are the frequency effects that can occur when a harmonic oscillator is disturbed by a second oscillator operating at a nearby frequency. When the coupling is strong enough and the frequencies near enough, the second oscillator can capture the first oscillator, causing it to have essentially identical frequency as the second. This is injection locking. When the second oscillator merely disturbs the first but does not capture it, the effect is called injection pulling. Injection locking and pulling effects are observed in numerous types of physical systems, however the terms are most often associated with electronic oscillators or laser resonators. Injection locking has been used in beneficial and clever ways in the design of early television sets and oscilloscopes, allowing the equipment to be synchronized to external signals at a relatively low cost. Injection locking has also been used in high performance frequency doubling circuits. However, injection locking and pulling, when unintended, can degrade the performance of phase-locked loops and RF integrated circuits.(For other definitions of "entrainment," see Entrainment (disambiguation).) (en) Con i termini injection locking e injection pulling ci si riferisce agli effetti sulla frequenza di un oscillatore armonico che è disturbato da un secondo oscillatore operante a una frequenza vicina. Quando l'accoppiamento è forte e le frequenze abbastanza vicine, il secondo oscillatore può catturare il primo oscillatore, modificandone la frequenza fino a renderla identica alla propria. Questo è il fenomeno dell'injection locking. Quando il secondo oscillatore invece non cattura il primo ma semplicemente lo disturba, si parla di injection pulling. Questi due fenomeni sono osservabili in un gran numero di sistemi fisici, benché siano più spesso associati agli oscillatori elettronici e ai risuonatori laser. L'injection locking è stato sfruttato in svariati modi per permettere il progetto dei primi televisori e oscilloscopi, ottenendo la sincronia dell'apparecchio ai segnali esterni ad un costo relativamente basso. Se sfruttato opportunamente, l'injection locking permette di ridurre significativamente il consumo di potenza e il rumore di fase nei sintetizzatori di frequenza. Similmente, le frequenze all'uscita di grandi laser possono essere rese spettralmente più pure accoppiando tali dispositivi con laser ad alta accuratezza. In generale però, quando l'injection locking e pulling sono indesiderati, tendono a degradare le prestazioni delle PLL e dei circuiti integrati a radiofrequenza. I segnali logici ad alta velocità e le loro armoniche sono infatti problematici per un oscillatore. L'accoppiamento di questi o di altri segnali ad altra frequenza con l'oscillatore attraverso un substrato in comune può causare un injection locking non voluto. In un moderno VCO, un segnale di injection-locking può prevalere sulla sua tensione di controllo a bassa frequenza, causando una perdita di controllo. (it) |
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| dbp:date | January 2020 (en) |
| dbp:description | Injection pulling and locking heard alternatively when one oscillator of two sweeps in frequency (en) |
| dbp:filename | InjectionLockedOscillators.ogg (en) |
| dbp:fixAttempted | yes (en) |
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| dbp:title | "Injection Locking and Pulling" (en) |
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| rdfs:comment | Injection locking and injection pulling are the frequency effects that can occur when a harmonic oscillator is disturbed by a second oscillator operating at a nearby frequency. When the coupling is strong enough and the frequencies near enough, the second oscillator can capture the first oscillator, causing it to have essentially identical frequency as the second. This is injection locking. When the second oscillator merely disturbs the first but does not capture it, the effect is called injection pulling. Injection locking and pulling effects are observed in numerous types of physical systems, however the terms are most often associated with electronic oscillators or laser resonators. (en) Con i termini injection locking e injection pulling ci si riferisce agli effetti sulla frequenza di un oscillatore armonico che è disturbato da un secondo oscillatore operante a una frequenza vicina. Quando l'accoppiamento è forte e le frequenze abbastanza vicine, il secondo oscillatore può catturare il primo oscillatore, modificandone la frequenza fino a renderla identica alla propria. Questo è il fenomeno dell'injection locking. Quando il secondo oscillatore invece non cattura il primo ma semplicemente lo disturba, si parla di injection pulling. Questi due fenomeni sono osservabili in un gran numero di sistemi fisici, benché siano più spesso associati agli oscillatori elettronici e ai risuonatori laser. (it) |
| rdfs:label | Injection locking (en) Injection locking (it) |
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