NPN vs PNP Transistor
Transistors yog 3 lub davhlau ya nyob twg semiconductor siv hauv hluav taws xob. Raws li kev ua haujlwm sab hauv thiab cov qauv transistors tau muab faib ua ob pawg, Bipolar Junction Transistor (BJT) thiab Field Effect Transistor (FET). BJT's yog thawj tus tsim tawm hauv xyoo 1947 los ntawm John Bardeen thiab W alter Brattain ntawm Bell Telephone Laboratories. PNP thiab NPN tsuas yog ob hom bipolar junction transistors (BJT).
Cov qauv ntawm BJTs yog xws li cov txheej nyias ntawm P-hom lossis N-hom semiconductor cov khoom yog sandwiched nyob rau hauv nruab nrab ntawm ob txheej ntawm ib qho opposite hom semiconductor. Lub sandwiched txheej thiab ob txheej txheej txheej tsim ob semiconductor junctions, li no lub npe Bipolar hlws ris Transistor. BJT nrog p-type semiconductor khoom nyob rau hauv nruab nrab thiab n-hom khoom ntawm ob sab yog hu ua NPN hom transistor. Ib yam li ntawd, BJT nrog cov khoom siv n-hom hauv nruab nrab thiab p-hom khoom ntawm ob sab yog hu ua PNP transistor.
Cov txheej nruab nrab hu ua lub hauv paus (B), thaum ib qho ntawm cov txheej txheej sab nrauv hu ua tus sau (C), thiab lwm qhov emitter (E). Cov junctions raug xa mus rau hauv lub hauv paus - emitter (B-E) junction thiab base-collector (B-C) junction. Lub hauv paus yog maj mam doped, thaum lub emitter yog heev doped. Tus neeg sau muaj qhov qis dua doping ntau dua li cov emitter.
Hauv kev ua haujlwm, feem ntau BE junction yog rau pem hauv ntej thiab BC kev sib tshuam yog thim rov qab nrog lub zog ntau dua. Tus nqi ntws yog vim muaj kev sib kis ntawm cov neeg nqa khoom hla ob qhov kev sib tshuam no.
Ntau txog PNP Transistors
A PNP transistor yog tsim los nrog cov khoom siv n-hom semiconductor nrog qhov tsis tshua muaj doping concentration ntawm tus neeg pub dawb impurity. Lub emitter yog doped ntawm qhov siab dua ntawm kev lees txais impurity, thiab tus neeg sau tau muab qis dua doping qib dua li cov emitter.
Hauv kev ua haujlwm, BE junction yog pem hauv ntej kev tsis ncaj ncees los ntawm kev siv lub peev xwm qis dua rau lub hauv paus, thiab BC junction yog thim rov qab siv ntau qhov hluav taws xob qis rau cov khoom sau. Hauv qhov kev teeb tsa no, PNP transistor tuaj yeem ua haujlwm raws li kev hloov pauv lossis lub suab nrov.
Feem ntau tus nqi thauj khoom ntawm PNP transistor, lub qhov, muaj kev txav mus los tsawg. Qhov no ua rau tus nqi qis dua ntawm cov lus teb thiab cov kev txwv hauv cov dej ntws tam sim no.
Ntau txog NPN Transistors
NPN hom transistor yog tsim los ntawm p-type semiconductor cov ntaub ntawv nrog rau qib qis doping. Tus emitter yog doped nrog tus neeg pub dawb impurity ntawm qib siab dua doping, thiab tus neeg sau tau doped nrog qib qis dua tus emitter.
Qhov kev teeb tsa tsis ncaj ncees ntawm NPN transistor yog qhov ntxeev ntawm PNP transistor. Cov voltages yog thim rov qab.
Feem ntau tus nqi thauj khoom ntawm NPN hom yog cov khoom siv hluav taws xob, uas muaj kev txav mus los ntau dua li qhov. Yog li ntawd, lub sij hawm teb ntawm NPN hom transistor yog ceev dua li PNP hom. Li no, NPN hom transistors yog cov feem ntau siv nyob rau hauv high zaus hais txog cov khoom siv thiab nws yooj yim ntawm kev tsim dua li PNP ua rau nws feem ntau siv ntawm ob hom.
Qhov txawv ntawm NPN thiab PNP Transistor yog dab tsi?
