Mai suna Diffusion Capacitance?

Takaitaccen tasirin k'arfin k'afa

Tasirin k'arfin k'afa yana nufin abubuwa da ke faruwa wajen k'afar p-n idan an yi amfani da shi da rarraba. Yana faru ne saboda tattalin hanyoyi na zahiri na kayayyakin da ke daga cikin wurare masana'antu kamar PN junction ko MOSFET, ya'ni wasu mafi girman hanyoyi a cikin wurare da aka samun harsuna suke zaune zuwa wurare da ba a samun harsuna ba don fadada tsari mai k'afa, kuma a nan yana faruwa a matsayin tasirin k'afa.

Muhimmin addini

Idan PN junction yana da rarraba, hanyoyi (electron da holes) za su zaune zuwa baya-bayan P da N regions. A nan, P area ta kasance wasu mafi girma da Jane (electronic), N area ta kasance wasu mafi girma da Jane (hole). Wasu mafi girman hanyoyi na musamman wadannan akwai suna faɗa waɗanda suna nuna k'afar k'afa, sama da k'afar, da kyau a takaice waɗanda suke saukar. Tasirin k'afar k'afa yana nau'i da rarraban rarrabinsa, hawa, da siffofin wurare masana'antu. Idan rarraban rarrabinsa yake da ƙarin, k'afar k'afansa yake da ƙarin.

Tsunan tasirin k'afar k'afa

Idan an yi amfani da rarrabinsa AC voltage a wurare masana'antu, yawan mafi girman hanyoyi na musamman yana canzawa da rarrabinsa. Hanyoyi na musamman suna ɗauki tsaye a wurare masana'antu kuma suna kasance zuwa wurare masana'antu. Wannan kasanci yana nufin abubuwa da ke faruwa wajen k'afa, ya'ni k'afar k'afa.

An zama a gudanar da k'afar k'afar k'afa a haka:

• CD ita ce k'afar k'afa.

• Qn ita ce mafi girman hanyoyi na musamman.

• V ita ce rarrabinsa da aka amfani.

K'afar k'afa a diode

A diodes, k'afar k'afar k'afa suna faru a cikin rarrabinsa da rarraba. Idan diode yana da rarraba, hanyoyi na musamman (kamar holes a N-type semiconductors) suna zaune zuwa P-region, wanda yake kawo karfi ga yawan mafi girman hanyoyi. Canzawar yawan mafi girman hanyoyi na Jane suna nuna abubuwa da ke faruwa wajen k'afa, ya'ni k'afar k'afa.

K'afar k'afa a transistor

A transistors (kamar BJT, MOSFETs, etc.), k'afar k'afar k'afa suna faru bayan base da emitter. Idan transistor yana yi aiki a tsari na hira ta hira ko ta lafiya, tasirin k'afar k'afar k'afa yana iya fi haɗa, saboda yana taimakawa gain da frequency response na transistor.

Tasirin k'afar k'afa

Tasirin k'afar k'afar k'afa a wurare masana'antu ana nufin cewa:

• Aiki a tsari na hira: A ayyuka da tsari na hira, k'afar k'afar k'afa suna ɗaukar bandwith na wurar da kuma yana taimakawa aiki a tsari na hira.

• Sokko ta hira: a ayyuka da sokko, k'afar k'afar k'afa suna taimakawa sokkon wurare, kuma yana ɗaukar loss.

• Giyarwar sinal: A amplifiers, k'afar k'afar k'afa suna iya kawo phase delay, wanda yake ɗaukar giyarwar sinal.

Tambayar

Tambayar da k'afar k'afar k'afa ana yi shi a haka:

• Q ita ce mafi girman electronic charge.

• NA ita ce doping concentration

• μn ita ce electron mobility.

• ϵr ita ce relative dielectric constant.

• ϵ0 ita ce dielectric constant of vacuum.

• VT ita ce thermal voltage, n = kT/q, k ita ce boltzmann constant, T ita ce absolute temperature.

• Vbi ita ce built-in potential.

Amfani

• Circuits na tsari na hira: A radio frequency (RF) da microwave circuits, ba a iya ƙara tsirin k'afar k'afar k'afa.

• Circuit na digital ta hira: a circuit na digital ta hira, k'afar k'afar k'afa suna taimakawa rise time da fall time na sinal.

• Management na power: A circuit na management na power, k'afar k'afar k'afa suna taimakawa efficiency na switching power supply.