Mfundo yogwira ntchito ya N-channel yowonjezeramo MOSFET

(1) Kuwongolera kwa vGS pa ID ndi njira

① Mlandu wa vGS=0

Zitha kuwoneka kuti pali magawo awiri obwerera-kumbuyo a PN pakati pa drain d ndi magwero a njira yowonjezera.MOSFET.

Pamene chipata-gwero voteji vGS = 0, ngakhale kukhetsa-gwero voteji vDS kuwonjezedwa, ndipo mosasamala kanthu za polarity wa vDS, nthawi zonse PN mphambano mu m'mbuyo kukondera boma.Palibe njira yoyendetsera pakati pa kukhetsa ndi gwero, kotero kukhetsa kwa ID≈0 pakadali pano.

② Nkhani ya vGS> 0

Ngati vGS> 0, gawo lamagetsi limapangidwa mu SiO2 insulating wosanjikiza pakati pa chipata ndi gawo lapansi.Mayendedwe a gawo lamagetsi ndi perpendicular kumunda wamagetsi wolunjika kuchokera pachipata kupita ku gawo lapansi pamtunda wa semiconductor.Malo amagetsiwa amathamangitsa mabowo ndikukopa ma elekitironi.Mabowo othamangitsa: Mabowo amtundu wa P pafupi ndi chipata amathamangitsidwa, ndikusiya ma ion osasunthika (ma ion negative) kuti apange wosanjikiza wochepa.Kukopa ma elekitironi: Ma electron (onyamula ochepa) omwe ali mu gawo la P-mtundu amakopeka ndi gawo lapansi.

(2) Kupanga njira yoyendetsera:

Pamene mtengo wa vGS uli wawung'ono ndipo kuthekera kokopa ma elekitironi sikuli kolimba, palibe njira yoyendetsera pakati pa kukhetsa ndi gwero.Pamene vGS ikuwonjezeka, ma electron ambiri amakopeka ndi gawo la P gawo lapansi.Pamene vGS ifika pamtengo wina, ma electrons amapanga N-mtundu woonda wosanjikiza pamwamba pa gawo la P pafupi ndi chipata ndipo amagwirizanitsidwa ndi zigawo ziwiri za N +, kupanga njira yoyendetsera mtundu wa N pakati pa kukhetsa ndi gwero.Mtundu wake wa conductivity ndi wosiyana ndi wa gawo la P, choncho umatchedwanso wosanjikiza.VGS yokulirapo ndiyo, mphamvu yamagetsi yomwe ikugwira ntchito pamtunda wa semiconductor ndi, ma elekitironi ambiri amakopeka pamwamba pa gawo lapansi la P, njira yoyendetsera magetsi imakhala yochuluka, ndipo kukana kwa njira kumakhala kochepa.Mphamvu yamagetsi yachipata pamene tchanelo chikuyamba kupanga chimatchedwa mphamvu yamagetsi, yoimiridwa ndi VT.