Field-effect transistors (FETs) tau muab faib ua ob pawg: junction field-effect transistors (JFETs) thiab insulated-gate field-effect transistors (MOS transistors).
Raws li cov khoom siv channel thiab insulated - hom rooj vag, lawv tau muab faib ua N-channel thiab P- hom channel. Raws li hom kev coj ua, lawv tau muab cais rau hauv depletion-hom thiab txhim kho- hom. JFETs yog tag nrho depletion-mode, thaum MOS transistors tuaj yeem yog depletion-mode lossis txhim kho-mode.
FETs tuaj yeem muab faib ua cov chaw sib txuas- cuam tshuam transistors (JFETs) thiab MOS teb- cuam tshuam cov transistors (MOS transistors). MOS transistors tau muab faib ua plaub pawg loj: N-channel depletion-hom thiab P-channel depletion- hom.
Junction Field-Cov nyhuv Transistors (JFETs)
1. Kev faib tawm ntawm Junction Field-Effect Transistors: JFETs muaj ob hom qauv: N-channel JFETs thiab P-channel JFETs.
JFETs kuj muaj peb lub electrodes: rooj vag, ntws, thiab qhov chaw.
Lub xub taw qhia ntawm lub rooj vag hauv lub cim Circuit Court tuaj yeem txhais raws li kev coj mus rau pem hauv ntej ntawm ob lub PN junctions.
2. Lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm qhov chaw sib txuas- cuam tshuam transistor (JFET) (noj ib qho N-channel JFET ua piv txwv): Cov qauv thiab lub cim ntawm N-channel JFET. Txij li cov neeg nqa khoom nyob rau hauv PN junction yog depleted, PN hlws ris yog qhov tseem ceeb tsis yog -conductive, tsim lub li - hu ua depletion cheeb tsam. Thaum lub qhov hluav taws xob ntws tawm ED yog qhov tas li, qhov tsis zoo ntawm lub rooj vag voltage, qhov thicker lub depletion cheeb tsam tsim ntawm PN hlws ris interface, uas ua rau ib tug nqaim channel ntawm qhov ntws thiab qhov chaw, thiab ib tug me me ntws tam sim no ID. Hloov pauv, yog tias lub rooj vag voltage tsawg dua qhov tsis zoo, cov channel nthuav dav, thiab ID nce. Yog li ntawd, lub rooj vag voltage EG tuaj yeem tswj tau qhov kev hloov pauv hauv cov dej ntws tam sim no; uas yog, JFET yog qhov hluav taws xob{10}} tswj cov khoom.
Rwb thaiv tsev -Gate Field-Effect Transistor (MOSFET)
1. Kev faib tawm ntawm Insulated-Gate Field-Effect Transistors (MOSFETs): Insulated-gate field-effect transistors kuj muaj ob hom qauv: N-channel thiab P-channel. Txawm li cas los xij, lawv tau muab faib ntxiv rau hauv kev txhim kho- hom thiab depletion- hom hom.
2. Nws yog tsim los ntawm hlau, oxide, thiab semiconductor, yog li nws tseem hu ua hlau -oxide-semiconductor teb- cuam tshuam transistor, lossis tsuas yog MOSFET.
3. Txoj Cai Ua Haujlwm ntawm Insulated Gate Field-Effect Transistors (siv N-channel txhim kho-mos MOSFETs ua piv txwv): Nws siv lub rooj vag hluav taws xob (UGS) los tswj tus nqi ntawm induced nqi, yog li hloov lub xeev ntawm cov conductive channel nyob rau hauv qhov kawg tsub nqi ntawm tam sim no. Thaum lub sij hawm transistor manufacturing, ib tug loj tus naj npawb ntawm zoo ions yog nkag mus rau hauv lub insulating txheej, inducing ib tug tseem ceeb npaum li cas ntawm cov nqi tsis zoo nyob rau sab nraud ntawm lub interface. Cov nqi tsis zoo no txuas rau cov doped N- cheeb tsam, tsim cov channel conductive, uas ua rau muaj qhov ntws loj tam sim no ID txawm tias VGS=0. Thaum lub rooj vag hluav taws xob hloov pauv, tus nqi ntawm induced charged hauv cov channel kuj hloov, thiab qhov dav ntawm cov conductive channel hloov raws li. Yog li ntawd, qhov ntws tam sim no ID hloov nrog lub rooj vag voltage.
Muaj ob hom kev khiav hauj lwm rau MOSFETs: cov uas muaj qhov ntws loj tam sim no thaum lub rooj vag voltage yog xoom hu ua depletion-mode; cov uas muaj xoom ntws tam sim no thaum lub rooj vag voltage yog xoom, yuav tsum tau ib lub rooj vag voltage los tsim cov dej ntws tam sim no, hu ua kev txhim kho- hom.
