FETs thiab yuav ua li cas lawv ua hauj lwm

Lub FETs yog cov semiconductor pab kiag li lawm, lub hauv paus ntsiab lus ntawm cov lag luam uas yog raws li nyob rau hauv cov kuj los ntawm ib tug transverse hluav taws xob field of tes taws los piav ntawm cov semiconductor khoom.

Lub qhov txawv feature ntawm no hom ntawm ntaus ntawv yog hais tias lub teb nyhuv transistors muaj ib tug high voltage nce thiab ib tug siab kam mus rau lub khoom.

Nyob rau hauv cov pab kiag li lawm nyob rau hauv cov creation ntawm ib tug hluav taws xob tam sim no tsuas them nqa ntawm tib hom yog muab kev koom tes (electrons).

Nws muaj ob hom ntawm FETs:

- muaj ib tug tir qauv, i.e. hlau, ua raws li los ntawm ib tug dielectric, ces tus semiconductor (mis);

- Tswj nrog pn-hlws ris.

Tus qauv ntawm lub nyuaj teb nyhuv transistor muaj xws li ib tug phaj ua los ntawm ib tug semiconductor khoom muaj ib tug pn-txoj kev hloov xwb nyob rau hauv qhov chaw thiab ohmic hu rau ntawm cov npoo.

Lub electrode nyob rau hauv xws li ib tug ntaus ntawv los ntawm cov uas ib tug kev channel xwb muaj no yog hu ua qhov chaw thiab lub electrode uas tus electrodes mam li tawm hauv channel - ntws.

Tej zaum nws tshwm sim hais tias xws li ib tug haib tseem ceeb ntaus ntawv tawm ntawm kev txiav txim. Yog li ntawd, thaum lub sij hawm kho tej yam uas hluav taws xob khoom no feem ntau yog tsim nyog los xyuas cov FET.

Ua li no, vypayat ntaus ntawv, vim hais tias nws yuav tsis tau mus xyuas nyob rau hauv cov hluav taws xob Circuit Court. Thiab ces, tom qab lus qhia, npaj mus rau checkout.

Teb cov nyhuv transistors muaj ob tug khiav hauj lwm hom - dynamic thiab qhov tseem ceeb.

Transistor lag luam - yog ib tug nyob rau hauv uas lub transistor yog nyob rau hauv ob lub xeev - nyob rau hauv ib tug siab qhib los yog siab kaw. Tab sis qhov no intermediate lub xeev, thaum lub tivthaiv yog qhib cov tsis tuaj kawm ntawv.

Nyob rau hauv lub zoo tagnrho cov ntaub ntawv, thaum lub transistor yog "qhib", i.e. yog li no-hu ua saturation hom, impedance ntawm lub terminals "ntws" thiab "qhov twg los" rau zero.

Hwj chim tsis thaum lub sij hawm qhib lub xeev voltage tshwm product (sib npaug zos rau zero) nyob rau hauv tus nqi ntawm cov tam sim no. Thiaj li, lub hwj chim dissipation yog pes tsawg.

Nyob rau hauv lub cutoff hom, i.e. thaum lub transistor blocks, cov kuj nruab nrab ntawm nws "ntws / qhov kev" deduces nyhav infinity. Fais fab dissipation rau hauv lub kaw lub xeev yog qhov khoom ntawm lub voltage thoob plaws lub tam sim no tus nqi sib npaug zos rau zero. Raws li, lub hwj chim tsis = 0.

Nws hloov tawm hais tias tus yuam sij hom ntawm transistors hwj chim tsis yog pes tsawg.

Nyob rau hauv kev xyaum, nyob rau hauv lub qhib transistor, lawm, ib txhia kuj "ntws / qhov kev" yuav tsum tam sim no. Nrog kaw transistor rau cov lus xaus rau tam sim no uas tsis muaj nqi tseem tshwm sim. Thiaj li, lub hwj chim tsis nyob rau hauv ib tug zoo li qub hom nyob rau hauv lub transistor yog tsawg heev.

Ib tug dynamically, thaum lub transistor raug kaw lawm los qhib, boosts nws linear cheeb tsam lub operating point qhov twg tam sim no ntws los ntawm cov transistor, conventionally yog ib nrab ntawm lub ntws tam sim no. Tab sis voltage "dab dej / qhov twg los" Feem ntau Nws ncav ib nrab ntawm cov nqi siab tshaj plaws. Li ntawd, cov dynamic qee hom qhia transistor loj loj hwj chim poob, uas thiaj li muaj qhov "tsis muaj" tus yuam sij hom zoo kawg li zog.

Tab sis, nyob rau hauv lem, heev raug ntawm cov transistor nyob rau hauv lub dynamic hom yog me npaum li cas tshaj qhov ntev ntawm nyob rau hauv lub zoo li qub hom. Raws li ib tug tshwm sim, lub efficiency ntawm ib tug transistor theem uas ua hauj lwm nyob rau hauv switching hom, yog heev thiab muaj peev xwm yuav cuaj caum peb mus rau cuaj caum-yim feem pua.

Teb cov nyhuv transistors uas khiav lag luam nyob rau hauv lub saum toj no hom, yog txaus lug siv nyob rau hauv hwj chim hloov lwm, ib tug mem tes hwj chim qhov chaw, tso zis rau theem ntawm tej yam transmitters thiab li ntawd.