Kusanthula Kupititsa patsogolo ndi Kutha kwa MOSFETs

D-FET ili pachipata cha 0 kukondera pomwe pali njira, imatha kuyendetsa FET; E-FET ili m'chipata cha 0 pamene palibe njira, sichikhoza kuyendetsa FET. mitundu iwiri iyi ya ma FET ali ndi mawonekedwe awoawo ndi ntchito zawo. Mwambiri, FET yowonjezereka pamabwalo othamanga kwambiri, otsika mphamvu ndiyofunika kwambiri; ndipo chipangizo ichi chikugwira ntchito, ndi polarity wa chipata kukondera vokukhetsa ndi kukhetsa voteji yemweyo, ndi yabwino mu dera kamangidwe.

Zomwe zimatchedwa kupititsa patsogolo njira: pamene VGS = 0 chubu ndi dziko lodulidwa, kuphatikizapo VGS yolondola, onyamula ambiri amakopeka ndi chipata, motero "kupititsa patsogolo" zonyamulira m'deralo, kupanga njira yoyendetsera. N-channel yopititsa patsogolo MOSFET kwenikweni ndi njira yolumikizira kumanzere kumanja, yomwe ndi semiconductor yamtundu wa P pakupanga kosanjikiza kwa filimu ya SiO2. Imapanga filimu yotchinga ya SiO2 pa semiconductor yamtundu wa P, kenako imagawaniza zigawo ziwiri zamtundu wa N-zopangidwa kwambiri.chithunzithunzi, ndipo amatsogolera maelekitirodi ku dera N-mtundu, wina kuda D ndi wina kwa gwero S. A wosanjikiza zitsulo zotayidwa yokutidwa pa insulating wosanjikiza pakati pa gwero ndi kuda monga chipata G. Pamene VGS = 0 V , pali ma diode angapo okhala ndi ma diode obwerera mmbuyo pakati pa kukhetsa ndi gwero ndipo voteji pakati pa D ndi S sapanga mphamvu pakati pa D ndi S. Pakali pano pakati pa D ndi S sichipangidwa ndi voteji yomwe imagwiritsidwa ntchito .

Pamene voteji pachipata anawonjezera, ngati 0 <VGS <VGS(th), kupyolera capacitive magetsi munda wopangidwa pakati pa chipata ndi gawo lapansi, mabowo polyon mu P-mtundu semiconductor pafupi pansi pa chipata amathamangitsidwa pansi, ndi wochepa thupi wosanjikiza wa ayoni zoipa amaoneka; pa nthawi yomweyo, izo kukopa oligons mmenemo kusamukira pamwamba wosanjikiza, koma chiwerengero ndi ochepa ndi osakwanira kupanga njira conductive kuti amalankhula kuda ndi gwero, choncho akadali osakwanira Mapangidwe kukhetsa ID panopa. kuwonjezeka kwina VGS, pamene VGS > VGS (th) (VGS (th) imatchedwa kutembenuka kwamagetsi), chifukwa panthawiyi magetsi a chipata chakhala champhamvu kwambiri, mu P-mtundu wa semiconductor pamwamba wosanjikiza pafupi ndi pansi pa chipata pansi pa kusonkhanitsa zambiri. ma elekitironi, mukhoza kupanga ngalande, kuda ndi gwero la kulankhulana. Ngati magetsi akukhetsa awonjezeredwa panthawiyi, kukhetsa kwapano kungapangidwe ID. ma elekitironi mu njira conductive anapanga pansi pa chipata, chifukwa cha dzenje chonyamulira ndi P-mtundu semiconductor polarity ndi zotsutsana, choncho amatchedwa wosanjikiza odana ndi mtundu. Pamene VGS ikupitilira kukula, ID ipitilira kukula. ID = 0 pa VGS = 0V, ndipo kukhetsa kwapano kumachitika pambuyo pa VGS> VGS(th), kotero, mtundu uwu wa MOSFET umatchedwa kuwonjezera MOSFET.

Ubale wowongolera wa VGS pa drain current utha kufotokozedwa ndi ma curve iD = f(VGS(th))|VDS=const, yomwe imatchedwa curve characteristic curve, ndi kukula kwa otsetsereka kwa curve, gm, Imawonetsa kuwongolera kwa mphamvu yakukhetsa ndi magetsi a gate source. kukula kwa gm ndi mA/V, kotero gm imatchedwanso transconductance.