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Travay frekans limit (F):
Anplifikatè Montre satisfè limit ki frekans k ap travay nan endèks divès kalite. Limit yo frekans ap travay ak anplifikatè efikas ka gen plis pase limit ki frekans k ap travay nan definisyon an.
Gen pouvwa (G):
Montre rezilta anplifikatè rapò a nan pouvwa ak pouvwa opinyon, se inite a souvan itilize "DB".
Akeri egalite depanse (Δ G):
Montre tonbe nan tanperati konstan, andedan limit nan frekans travay tout antye, limit yo kwè ke chanjman benefis anplifikatè. Balances Akeri depanse eksprime pa di ki kalite kap vini yo (al gade yon 1 foto):
Graf 1
Δ G = ± (Gmax-Gmin) / 2dB
Δ G: Akeri egalite depanse
Gmax: Akeri - maksimòm nan limit yo nan koub bale frekans
Gmin: Akeri - sijè ki abòde lan koub bale frekans sa yo ki valè a pi piti
Koyefisyan Bri (NF):
Koyefisyan bri se montre opinyon fen kwè konpare nan yon konfizyon nan vwa ak pwodiksyon anplifikatè fen kwè rapò a ke yon konfizyon nan vwa konpare, se inite a souvan itilize "DB".
Koyefisyan Bri eksprime pa di ki kalite pwochen: A konfizyon nan vwa nan lèt nan NF = 10lg (fen D 'se konpare / se yon konfizyon nan vwa nan lèt fen pwodiksyon konpare)
Koyefisyan bri nan anplifikatè a pi ba (pa egzanp NF <1) anba sikonstans lan, nòmalman koyefisyan bri anplifikatè a itilize tanperati bri (T) ap eksprime.
Relasyon la nan koyefisyan bri ak tanperati kontwol bwi an se: T = (NF-1) T0 oswa NF = T / T0 + 1
T0-absoliman tanperati (290K)
Konvèsyon tab la nan koyefisyan bri ak tanperati bri (al gade yon 2 foto)
1 decibel konprès yon dot sou pouvwa a pwodiksyon (P1dB):
Anplifikatè gen yon seri lineyè ak dinamik, andedan sa a limit, pouvwa a pwodiksyon nan anplifikatè ogmante ansanm ak opinyon pouvwa lineyè. Sa a jan de anplifikatè di pou anplifikatè lineyè, nan sa yo pouvwa de konpare se pouvwa benefis G. Ogmante kòm kontinite D 'pouvwa a, anplifikatè se te antre nan linear zòn, pouvwa pwodiksyon li swiv adisyon a nan D' pouvwa pa gen okenn ankò ak ogmantasyon lineyè, ki vle di , pwodiksyon li pri a ki pouvwa predi anba kote pou pran siyal ki piti yo. Pouvwa a pwodiksyon lè jete jwenn pi ba pase 1dB genyen lineyè nòmalman se vo yon definisyon diminye yon pwen nan pwodiksyon 1dB la ki gen pouvwa, eksprime ak P1dB. (Al gade yon 3 foto)
Pi ba a tipik sitiyasyon, lè pouvwa depase P1dB, benefis yo pral lage byen vit epi reyalize pouvwa a pwodiksyon pi gwo oswa konplètman satire, li yo ki ap vo pi gwo pase P1dB 3-4dB.
3 ran koupe souke tèt (IP3):
Moun ki anplifikatè mezi ki karakteristik linear, metòd la pi senp se mezire 1dB konsentre ti jan nan pouvwa n P1dB. Yon lòt metòd trè popilè se sèvi ak de apa 5 siyal la adjasan a 10MHz, lè sa yo siyal de ki F1 ak F2 lè frekans ajoute yon anplifikatè, pwodiksyon an nan sa a anplifikatè ki sa yo siyal de pa sèlman, pwa li ak nan entèrmodulasyon ki tou te gen ladann frekans yo dwe Mf1 + nf2 (IM), isit la, rele M + n nimewo a ran nan entèrmodulasyon HEFT. Lè mwayen ak satire n, retire moun ki kontwole fonksyon nòmalman ki pi adjasan a nan fondamantal frekans HEFT ran 3 (al gade yon 4 foto).
Paske 3 ran jouk gout deformation trè grav ap monte kontwole fonksyon, se konsa yo souvan itilize koupe ran 3 nodded (IP3) vin siy distòsyon entèrmodulasyon (gade yon foto 3). Point nan chèk 3 ran a se yon lè dekri lineyè to anplifikatè prensipal endèks. 3 koupe ran souke tèt modèl la ki gen pouvwa yo dwe vo pi wo pase P1dB 10-12dB. IP3 ka jwenn atravè mezire IM3, fòmil enfòmatik se:
lòt pwodwi nou an:
Pwofesyonèl pakè ekipman estasyon radyo FM
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