Tsarin BCD

Menene tsarin BCD?

Tsarin BCD fasaha ce ta tsari mai haɗa guntu ɗaya da ST ta fara gabatar da ita a shekarar 1986. Wannan fasaha na iya yin na'urorin bipolar, CMOS da DMOS a kan guntu ɗaya. Bayyanar sa tana rage yankin guntu sosai.

Za a iya cewa tsarin BCD yana amfani da fa'idodin ƙarfin tuƙi na Bipolar gaba ɗaya, haɗin kai mai yawa na CMOS da ƙarancin amfani da wutar lantarki, da kuma ƙarfin wutar lantarki mai yawa na DMOS da ƙarfin kwararar wutar lantarki mai yawa. Daga cikinsu, DMOS shine mabuɗin inganta wutar lantarki da haɗin kai. Tare da ci gaba da haɓaka fasahar da'ira mai haɗawa, tsarin BCD ya zama babban fasahar masana'antu na PMIC.

Tsarin BCD na giciye-sashe, hanyar sadarwa ta tushe, na gode

Fa'idodin tsarin BCD

Tsarin BCD yana sanya na'urorin Bipolar, na'urorin CMOS, da na'urorin wutar lantarki na DMOS a kan guntu ɗaya a lokaci guda, suna haɗa ƙarfin transconductance da ƙarfin tuƙi mai ƙarfi na na'urorin bipolar da kuma yawan haɗakarwa da ƙarancin amfani da wutar lantarki na CMOS, don su iya haɗa junansu da kuma ba da cikakken wasa ga fa'idodinsu; a lokaci guda, DMOS na iya aiki a yanayin sauyawa tare da ƙarancin amfani da wutar lantarki. A takaice, ƙarancin amfani da wutar lantarki, ingantaccen amfani da makamashi da haɗin kai mai yawa suna ɗaya daga cikin manyan fa'idodin BCD. Tsarin BCD na iya rage yawan amfani da wutar lantarki sosai, inganta aikin tsarin da kuma samun ingantaccen aminci. Ayyukan samfuran lantarki suna ƙaruwa kowace rana, kuma buƙatun canje-canje na ƙarfin lantarki, kariyar capacitor da tsawaita rayuwar baturi suna ƙara zama mahimmanci. Halayen BCD masu sauri da adana makamashi suna cika buƙatun tsari don guntuwar sarrafa analog/iko mai aiki.

Mahimman fasahohin tsarin BCD

Na'urorin da aka saba amfani da su a tsarin BCD sun haɗa da ƙananan ƙarfin lantarki CMOS, bututun MOS masu ƙarfin lantarki mai yawa, LDMOS masu ƙarfin lantarki daban-daban, NPN/PNP na tsaye da Schottky diodes, da sauransu. Wasu hanyoyin kuma suna haɗa na'urori kamar JFET da EEPROM, wanda ke haifar da nau'ikan na'urori iri-iri a cikin tsarin BCD. Saboda haka, baya ga la'akari da dacewa da na'urori masu ƙarfin lantarki mai yawa da na'urorin ƙarancin ƙarfin lantarki, hanyoyin dannawa sau biyu da hanyoyin CMOS, da sauransu a cikin ƙira, dole ne a yi la'akari da fasahar keɓewa mai dacewa.

A cikin fasahar warewar BCD, fasahohi da yawa kamar warewar mahaɗi, warewar kai da warewar dielectric sun bayyana ɗaya bayan ɗaya. Fasaha warewar mahaɗi ita ce a yi na'urar a kan layin epitaxial na nau'in N na substrate na nau'in P kuma a yi amfani da halayen juyawar juyawar mahaɗin PN don cimma rabuwa, saboda mahaɗin PN yana da juriya sosai a ƙarƙashin juyawar juyawa.

Fasahar keɓe kai ita ce keɓancewa ta mahaɗin PN, wadda ta dogara ne akan halayen mahaɗin PN na halitta tsakanin yankin tushe da magudanar ruwa na na'urar da substrate don cimma warewa. Lokacin da aka kunna bututun MOS, yankin tushe, yankin magudanar ruwa da tashar suna kewaye da yankin raguwa, suna samar da warewa daga substrate. Lokacin da aka kashe shi, mahaɗin PN tsakanin yankin magudanar ruwa da substrate yana juyawa baya, kuma babban ƙarfin wutar lantarki na yankin tushe yana ware ta hanyar yankin raguwa.

Keɓewar Dielectric yana amfani da kafofin watsa labarai masu hana ruwa shiga kamar silicon oxide don cimma keɓewa. Dangane da keɓewar dielectric da keɓewar mahaɗi, an haɓaka keɓewar quasi-dielectric ta hanyar haɗa fa'idodin duka biyun. Ta hanyar zaɓar fasahar keɓewa da ke sama, ana iya cimma daidaiton babban ƙarfin lantarki da ƙarancin ƙarfin lantarki.

Hanyar ci gaba ta tsarin BCD

Ci gaban fasahar tsarin BCD ba kamar tsarin CMOS na yau da kullun ba ne, wanda koyaushe yana bin dokar Moore don haɓaka ta hanyar ƙaramin faɗin layi da sauri. Tsarin BCD yana da bambanci sosai kuma an haɓaka shi ta hanyoyi uku: babban ƙarfin lantarki, babban ƙarfi, da babban yawa.

1. Babban ƙarfin lantarki na BCD

BCD mai ƙarfin lantarki mai yawa zai iya ƙera da'irori masu sarrafa ƙananan ƙarfin lantarki masu inganci da da'irori masu matakin DMOS masu ƙarfi a kan guntu ɗaya a lokaci guda, kuma zai iya samar da na'urori masu ƙarfin lantarki mai ƙarfi 500-700V. Duk da haka, gabaɗaya, BCD har yanzu ya dace da samfuran da ke da buƙatu masu yawa don na'urorin wutar lantarki, musamman na'urorin BJT ko na'urorin DMOS masu ƙarfin lantarki, kuma ana iya amfani da su don sarrafa wutar lantarki a cikin hasken lantarki da aikace-aikacen masana'antu.

Fasaha ta yanzu don ƙera BCD mai ƙarfin lantarki mai yawa ita ce fasahar RESURF da Appel et al. suka gabatar a shekarar 1979. An ƙera na'urar ta amfani da wani ƙaramin Layer na epitaxial don sanya rarraba filin lantarki na saman ya yi laushi, ta haka ne inganta halayen lalacewar saman, ta yadda lalacewar ta faru a jiki maimakon saman, ta haka ne ƙara ƙarfin lalacewar na'urar. Ƙara haske wata hanya ce ta ƙara ƙarfin rushewar BCD. Yawanci tana amfani da DDD mai rarrabawa sau biyu (Doping Drain sau biyu) da LDD mai rage haske (Doping Drain mai sauƙi). A yankin magudanar ruwa na DMOS, ana ƙara yankin drift na nau'in N don canza hulɗar asali tsakanin magudanar ruwa ta N+ da substrate na nau'in P zuwa hulɗar tsakanin magudanar ruwa ta N- da substrate na nau'in P, ta haka ne ake ƙara ƙarfin rushewar.

2. Babban ƙarfin BCD alkibla

Tsarin ƙarfin lantarki na BCD mai ƙarfi shine 40-90V, kuma galibi ana amfani da shi a cikin na'urorin lantarki na motoci waɗanda ke buƙatar ƙarfin tuƙi mai ƙarfi, matsakaicin ƙarfin lantarki da kuma da'irori masu sauƙi na sarrafawa. Halayen buƙatarsa ​​sune ƙarfin tuƙi mai ƙarfi, matsakaicin ƙarfin lantarki, kuma da'irar sarrafawa sau da yawa tana da sauƙi.

3. Alkiblar BCD mai yawan yawa

BCD mai yawan yawa, kewayon ƙarfin lantarki shine 5-50V, kuma wasu na'urorin lantarki na mota zasu kai 70V. Ana iya haɗa ayyuka masu rikitarwa da bambance-bambance a kan guntu ɗaya. BCD mai yawan yawa yana ɗaukar wasu ra'ayoyin ƙira na zamani don cimma bambancin samfura, galibi ana amfani da su a aikace-aikacen lantarki na motoci.

Babban aikace-aikacen tsarin BCD

Ana amfani da tsarin BCD sosai a fannin sarrafa wutar lantarki (ikon sarrafawa da batir), tuƙin nuni, na'urorin lantarki na mota, sarrafa masana'antu, da sauransu. Chip ɗin sarrafa wutar lantarki (PMIC) yana ɗaya daga cikin mahimman nau'ikan kwakwalwan analog. Haɗin tsarin BCD da fasahar SOI shi ma babban fasali ne na ci gaban tsarin BCD.

VET-China na iya samar da sassan graphite, jil ɗin laushi mai ƙarfi, sassan silicon carbide, sassan cvD silicon carbide, da sassan sic/Tac masu rufi cikin kwanaki 30.
Idan kuna sha'awar samfuran semiconductor da ke sama, don Allah kada ku yi jinkirin tuntuɓar mu a karon farko.

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