Zofunikira zazikulu za MOSFETs ndikuyerekeza ndi ma triodes

Field Effect Transistor yofupikitsidwa ngatiMOSFET.Pali mitundu iwiri ikuluikulu: machubu ophatikizika akumunda ndi machubu achitsulo-oxide semiconductor field effect. MOSFET imadziwikanso kuti unipolar transistor yokhala ndi zonyamula zambiri zomwe zimakhudzidwa ndi conductivity. Ndi zida za semiconductor zoyendetsedwa ndi voteji. Chifukwa cha kukana kwake kwakukulu, phokoso lochepa, kugwiritsa ntchito mphamvu zochepa, ndi makhalidwe ena, zomwe zimapangitsa kuti zikhale zotsutsana kwambiri ndi bipolar transistors ndi transistors mphamvu.

I. Zofunikira zazikulu za MOSFET

1, DC magawo

Saturation drain current imatha kufotokozedwa ngati kukhetsa komwe kumayenderana ndi pomwe mphamvu yamagetsi pakati pa chipata ndi gwero ili yofanana ndi ziro ndipo voteji pakati pa kukhetsa ndi gwero ndi yayikulu kuposa voteji yotsina.

Pinch-off voltage UP: Ma UGS amafunikira kuti achepetse ID kukhala yaing'ono pomwe UDS ili yotsimikizika;

Mphamvu yoyatsa UT: UGS imafunika kuti ibweretse ID pamtengo wina UDS ikatsimikizika.

2, AC Parameters

Low-frequency transconductance gm : Imafotokoza momwe chipata ndi magwero amagetsi amagwirira ntchito.

Inter-pole capacitance: capacitance pakati pa ma elekitirodi atatu a MOSFET, kuchepa kwa mtengo, kumapangitsanso magwiridwe antchito.

3, malire magawo

Kukhetsa, gwero lakuwonongeka kwamagetsi: kukhetsa kwapano kukakwera kwambiri, kumapangitsa kuti UDS iwonongeke.

Magetsi osweka pachipata: makulidwe ophatikizika amachubu ogwirira ntchito wamba, chipata ndi gwero pakati pa mphambano ya PN m'malo okonda kukondera, yapano ndi yayikulu kwambiri kuti isawonongeke.

II. Makhalidwe aZithunzi za MOSFET

MOSFET ili ndi ntchito yokulitsa ndipo imatha kupanga gawo lokulitsa. Poyerekeza ndi triode, ili ndi zotsatirazi.

(1) MOSFET ndi chipangizo choyendetsedwa ndi magetsi, ndipo kuthekera kumayendetsedwa ndi UGS;

(2) Zomwe zilipo pakulowetsa kwa MOSFET ndizochepa kwambiri, chifukwa chake kukana kwake ndikokwera kwambiri;

(3) Kukhazikika kwa kutentha kwake ndikwabwino chifukwa imagwiritsa ntchito zonyamulira zambiri pakuwongolera;

(4) Mphamvu yokulitsa mphamvu yamagetsi ake ndi yaying'ono kuposa ya triode;

(5) Imalimbana ndi ma radiation.

Chachitatu,MOSFET ndi kufananiza kwa transistor

(1) Gwero la MOSFET, chipata, kukhetsa ndi gwero la triode, maziko, malo okhazikika amafanana ndi ntchito yofananira.

(2) MOSFET ndi chipangizo chamakono choyendetsedwa ndi voteji, chowonjezera chokulitsa ndi chaching'ono, luso lokulitsa ndilochepa; triode ndi chipangizo chamagetsi choyendetsedwa ndipano, luso lokulitsa ndi lamphamvu.

(3) Chipata cha MOSFET kwenikweni sichitengera zamakono; ndi ntchito ya triode, maziko amatengera mphamvu inayake. Chifukwa chake, kukana kwa chipata cha MOSFET ndikokwera kwambiri kuposa kukana kuyika kwa triode.

(4) The conductive ndondomeko ya MOSFET ali nawo polytron, ndipo triode ali nawo mitundu iwiri ya zonyamulira, polytron ndi oligotron, ndi ndende yake oligotron amakhudzidwa kwambiri ndi kutentha, ma radiation ndi zinthu zina, choncho, MOSFET. ali bwino kutentha bata ndi kukana ma radiation kuposa transistor. MOSFET iyenera kusankhidwa pamene zinthu zachilengedwe zikusintha kwambiri.

(5) MOSFET ikalumikizidwa ndi gwero lachitsulo ndi gawo lapansi, gwero ndi kukhetsa zitha kusinthidwa ndipo mawonekedwewo sasintha kwambiri, pomwe wokhometsa ndi emitter wa transistor asinthidwa, mawonekedwe amasiyana ndi mtengo wa β. yafupika.

(6) Phokoso la MOSFET ndilochepa.

(7) MOSFET ndi triode zitha kupangidwa ndi mabwalo osiyanasiyana amplifier ndi ma switching mabwalo, koma akale amadya mphamvu zochepa, kukhazikika kwamafuta ambiri, ma voliyumu osiyanasiyana operekera, motero amagwiritsidwa ntchito kwambiri muzambiri zazikulu komanso zazikulu kwambiri. sikelo Integrated mabwalo.

(8) Kukaniza kwa triode ndikokulirapo, ndipo kukana kwa MOSFET ndikocheperako, kotero ma MOSFET nthawi zambiri amagwiritsidwa ntchito ngati masiwichi omwe ali ndi luso lapamwamba.