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1. Konsèp nan PLL
Sa nou rele PLL. An reyalite, li se yon bouk faz-fèmen, refere yo kòm yon bouk faz-fèmen pou kout. Pou anpil aparèy elektwonik travay nòmalman, siyal ekstèn opinyon an anjeneral senkronize ak siyal entèn osilan an. Sa a ka reyalize lè l sèvi avèk yon bouk faz-fèmen. Faz-fèmen bouk se yon sikwi kontwòl fidbak, refere yo kòm faz-fèmen bouk (PLL). Karakteristik nan faz-fèmen bouk la se ke frekans lan ak faz nan siyal la osilan andedan bouk la yo kontwole pa opinyon an siyal referans soti an deyò de la.
Paske bouk faz-bloke a ka otomatikman swiv frekans nan siyal pwodiksyon an nan frekans nan siyal la opinyon, se bouk la faz-fèmen anjeneral yo itilize nan yon sikwi fèmen-sikwi swiv. Pandan operasyon an nan faz-fèmen bouk la, lè frekans nan siyal la pwodiksyon ki egal a frekans nan siyal la opinyon, vòltaj la pwodiksyon ak vòltaj la opinyon kenbe yon diferans faz fiks, se sa ki, faz nan vòltaj la pwodiksyon ak vòltaj la opinyon yo fèmen, ki se faz fèmen Orijin lan nan non an bag.
Koulye a, faz-fèmen pasan sitou gen ladan analòg faz-fèmen pasan, pasan dijital faz-fèmen, ak faz-fèmen pasan ak kapasite memwa (òdinatè-kontwole).
2. Konpozisyon PLL
Bouk faz-fèmen a anjeneral konsiste de twa pati: yon detektè faz (PD), yon filtre bouk (LF) ak yon osilateur vòltaj-kontwole (VCO). Dyagram nan blòk prensip nan faz-fèmen bouk la yo montre nan Figi 8-4-1. Se detektè a faz nan bouk la faz-fèmen yo te rele tou faz la konparateur. Fonksyon li se detekte diferans faz ant siyal la opinyon ak siyal la pwodiksyon, ak konvèti siyal la diferans faz detekte nan yon siyal vòltaj uD (t) pou pwodiksyon an. Apre filtraj pa filtè ki ba-pas la, vòltaj kontwòl uC (t) nan osilator ki kontwole vòltaj la fòme, epi frekans siyal pwodiksyon osilatè a kontwole.
lòt pwodwi nou an:
Pwofesyonèl pakè ekipman estasyon radyo FM
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es.fmuser.org
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af.fmuser.org -> Afriken
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ar.fmuser.org -> Arab
hy.fmuser.org -> Armenian
az.fmuser.org -> Azerbaydjan
eu.fmuser.org -> Basque
be.fmuser.org -> Belarisyen
bg.fmuser.org -> Bulgarian
ca.fmuser.org -> Katalan
zh-CN.fmuser.org -> Chinwa (senplifye)
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yi.fmuser.org -> Yiddish
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