Yang'anani pa MOSFETs

Ma MOSFET akutsekera ma MOSFET m'magawo ophatikizika.MOSFETs, monga chimodzi mwa zida zofunika kwambiri musemiconductor field, amagwiritsidwa ntchito kwambiri mumayendedwe a board-level komanso mu IC design.The drain and source ofZithunzi za MOSFET akhoza kusinthidwa, ndipo amapangidwa mumtundu wa P-backgate wokhala ndi dera la mtundu wa N. Kawirikawiri, magwero awiriwa amatha kusinthana, onse akupanga dera la mtundu wa NP-mtundu wa backgate. Kawirikawiri, madera awiriwa ndi ofanana, ndipo ngakhale zigawo ziwirizi zitasinthidwa, ntchito ya chipangizocho sichidzakhudzidwa. Choncho, chipangizocho chimaonedwa kuti ndi chofanana.

Mfundo Yofunika:

MOSFET imagwiritsa ntchito VGS kuwongolera kuchuluka kwa "charge induced" kuti isinthe mawonekedwe a njira yoyendetsera yopangidwa ndi "malipiro opangira" awa kuti athetse kukhetsa kwapano. Pamene ma MOSFET amapangidwa, ma ions ambiri abwino amawonekera muzitsulo zotetezera kupyolera mwa njira zapadera, kotero kuti milandu yowonjezereka ingathe kumveka mbali ina ya mawonekedwe, ndipo N-chigawo cha zonyansa zapamwamba zimagwirizanitsidwa ndi milandu zoipa izi, ndi conductive njira aumbike, ndipo ndi lalikulu kukhetsa panopa, ID, kwaiye ngakhale VGS ndi 0. Ngati chipata voteji kusinthidwa, kuchuluka kwa ndalama anachititsa mu njira amasintha, ndi m'lifupi. za conductive channel kusintha pamlingo womwewo. Ngati magetsi a pachipata asintha, kuchuluka kwa ndalama zomwe zimapangidwira mu njirayo zidzasinthanso, ndipo m'lifupi mwa njira yoyendetsera idzasintha, kotero kuti ID yamakono idzasintha pamodzi ndi magetsi a chipata.

Udindo:

1. Ikhoza kugwiritsidwa ntchito ku dera la amplifier. Chifukwa cha kulowetsedwa kwakukulu kwa amplifier ya MOSFET, mphamvu yolumikizira imatha kukhala yaying'ono ndipo ma electrolytic capacitor sangagwiritsidwe ntchito.

High input impedance ndi yoyenera kutembenuka kwa impedance. Nthawi zambiri amagwiritsidwa ntchito pakusintha kwa impedance mu gawo lothandizira la ma multi-stage amplifiers.

3, Itha kugwiritsidwa ntchito ngati resistor variable.

4, itha kugwiritsidwa ntchito ngati chosinthira chamagetsi.

Ma MOSFET tsopano amagwiritsidwa ntchito m'mapulogalamu osiyanasiyana, kuphatikiza mitu yapa kanema wawayilesi ndikusintha magetsi. Masiku ano, ma transistors wamba a bipolar ndi MOS amaphatikizidwa pamodzi kupanga IGBT (insulated gate bipolar transistor), yomwe imagwiritsidwa ntchito kwambiri m'malo amphamvu kwambiri, ndipo mabwalo ophatikizika a MOS ali ndi mawonekedwe osagwiritsa ntchito mphamvu zochepa, ndipo tsopano ma CPU agwiritsidwa ntchito kwambiri Zozungulira za MOS.