Cov txheej txheem BCD

Cov txheej txheem BCD yog dab tsi?

Cov txheej txheem BCD yog ib qho txheej txheem kev sib xyaw ua ke ntawm ib lub chip uas ST tau qhia thawj zaug hauv xyoo 1986. Cov thev naus laus zis no tuaj yeem ua rau cov khoom siv bipolar, CMOS thiab DMOS ntawm tib lub chip. Nws qhov tsos ua rau thaj chaw ntawm lub chip txo qis heev.

Nws tuaj yeem hais tias cov txheej txheem BCD siv tag nrho cov txiaj ntsig ntawm Bipolar tsav tsheb muaj peev xwm, CMOS kev sib koom ua ke siab thiab kev siv hluav taws xob tsawg, thiab DMOS siab voltage thiab tam sim no muaj peev xwm ntws. Ntawm lawv, DMOS yog qhov tseem ceeb rau kev txhim kho lub zog thiab kev sib koom ua ke. Nrog rau kev txhim kho ntxiv ntawm cov thev naus laus zis sib xyaw ua ke, cov txheej txheem BCD tau dhau los ua cov thev naus laus zis tsim khoom tseem ceeb ntawm PMIC.

Daim duab qhia txog kev txiav ntawm cov txheej txheem BCD, qhov chaw sib txuas lus, ua tsaug

Cov txiaj ntsig ntawm cov txheej txheem BCD

Cov txheej txheem BCD ua rau cov khoom siv Bipolar, CMOS, thiab DMOS fais fab khoom siv rau tib lub chip tib lub sijhawm, kev sib koom ua ke ntawm kev hloov pauv siab thiab kev tsav tsheb muaj zog ntawm cov khoom siv bipolar thiab kev sib koom ua ke siab thiab kev siv hluav taws xob tsawg ntawm CMOS, yog li lawv tuaj yeem ua ke thiab muab kev ua si tag nrho rau lawv cov txiaj ntsig; tib lub sijhawm, DMOS tuaj yeem ua haujlwm hauv hom hloov pauv nrog kev siv hluav taws xob tsawg heev. Hauv ntej, kev siv hluav taws xob tsawg, kev siv hluav taws xob zoo thiab kev sib koom ua ke siab yog ib qho ntawm cov txiaj ntsig tseem ceeb ntawm BCD. Cov txheej txheem BCD tuaj yeem txo qhov kev siv hluav taws xob, txhim kho kev ua haujlwm ntawm lub cev thiab muaj kev ntseeg siab zoo dua. Cov haujlwm ntawm cov khoom siv hluav taws xob tab tom nce ntxiv txhua hnub, thiab cov kev xav tau rau kev hloov pauv hluav taws xob, kev tiv thaiv capacitor thiab kev ncua lub neej roj teeb tau dhau los ua qhov tseem ceeb. Cov yam ntxwv ceev ceev thiab txuag hluav taws xob ntawm BCD ua tau raws li cov txheej txheem xav tau rau cov khoom siv analog / tswj hwm hluav taws xob ua tau zoo.

Cov thev naus laus zis tseem ceeb ntawm cov txheej txheem BCD

Cov khoom siv ib txwm muaj ntawm cov txheej txheem BCD suav nrog CMOS qis-voltage, cov raj MOS siab-voltage, LDMOS nrog ntau yam kev tawg hluav taws xob, ntsug NPN / PNP thiab Schottky diodes, thiab lwm yam. Qee cov txheej txheem kuj koom ua ke cov khoom siv xws li JFET thiab EEPROM, ua rau muaj ntau yam khoom siv hauv cov txheej txheem BCD. Yog li ntawd, ntxiv rau kev xav txog kev sib raug zoo ntawm cov khoom siv hluav taws xob siab thiab cov khoom siv hluav taws xob qis, cov txheej txheem ob npaug nias thiab cov txheej txheem CMOS, thiab lwm yam hauv kev tsim qauv, cov thev naus laus zis cais tawm tsim nyog kuj yuav tsum tau xav txog.

Hauv kev siv tshuab cais BCD, ntau yam thev naus laus zis xws li kev sib txuas sib cais, kev cais tus kheej thiab kev cais dielectric tau tshwm sim ib qho tom qab ib qho. Kev siv tshuab cais sib txuas yog ua kom lub cuab yeej nyob rau ntawm txheej N-hom epitaxial ntawm P-hom substrate thiab siv cov yam ntxwv rov qab ntawm PN sib txuas kom ua tiav kev cais, vim tias PN sib txuas muaj kev tiv thaiv siab heev nyob rau hauv kev rov qab.

Cov thev naus laus zis cais tus kheej yog qhov tseem ceeb ntawm kev cais tawm PN junction, uas vam khom cov yam ntxwv ntuj PN junction ntawm qhov chaw pib thiab thaj chaw ntws ntawm lub cuab yeej thiab lub substrate kom ua tiav kev cais tawm. Thaum lub raj MOS qhib, thaj chaw pib, thaj chaw ntws thiab channel raug puag ncig los ntawm thaj chaw depletion, tsim kev cais tawm ntawm lub substrate. Thaum nws raug kaw, PN junction ntawm thaj chaw ntws thiab lub substrate yog rov qab biased, thiab qhov hluav taws xob siab ntawm thaj chaw pib raug cais tawm los ntawm thaj chaw depletion.

Kev rho tawm dielectric siv cov khoom siv rwb thaiv tsev xws li silicon oxide los ua kom tiav kev rho tawm. Raws li kev rho tawm dielectric thiab kev rho tawm sib txuas, kev rho tawm quasi-dielectric tau tsim los ntawm kev sib txuas cov txiaj ntsig ntawm ob qho tib si. Los ntawm kev xaiv cov thev naus laus zis rho tawm saum toj no, kev sib raug zoo ntawm cov hluav taws xob siab thiab cov hluav taws xob qis tuaj yeem ua tiav.

Kev coj ua ntawm BCD txheej txheem

Kev tsim cov txheej txheem BCD tsis zoo li cov txheej txheem CMOS tus qauv, uas ib txwm ua raws li Moore txoj cai los txhim kho hauv kev coj ntawm txoj kab me dua thiab qhov ceev dua. Cov txheej txheem BCD yog qhov sib txawv thiab tsim kho hauv peb qhov kev taw qhia: hluav taws xob siab, lub zog siab, thiab qhov ceev ceev.

1. Kev taw qhia BCD siab-voltage

BCD muaj zog siab tuaj yeem tsim cov voj voog tswj hwm qis-voltage siab thiab cov voj voog ultra-high-voltage DMOS-level ntawm tib lub chip tib lub sijhawm, thiab tuaj yeem paub txog kev tsim cov khoom siv hluav taws xob siab 500-700V. Txawm li cas los xij, feem ntau, BCD tseem tsim nyog rau cov khoom siv hluav taws xob uas xav tau ntau, tshwj xeeb tshaj yog BJT lossis cov khoom siv DMOS tam sim no siab, thiab tuaj yeem siv rau kev tswj hwm hluav taws xob hauv teeb pom kev zoo hluav taws xob thiab kev siv hauv kev lag luam.

Cov thev naus laus zis tam sim no rau kev tsim cov BCD siab-voltage yog cov thev naus laus zis RESURF uas Appel et al. tau tshaj tawm xyoo 1979. Lub cuab yeej no yog tsim los ntawm kev siv cov txheej epitaxial uas muaj cov khoom sib xyaw ua ke kom ua rau qhov chaw hluav taws xob ntawm qhov chaw sib faib ua kom tiaj tus, yog li txhim kho cov yam ntxwv ntawm qhov tawg ntawm qhov chaw, yog li qhov tawg tshwm sim hauv lub cev es tsis yog ntawm qhov chaw, yog li ua rau lub zog tawg ntawm lub cuab yeej nce ntxiv. Lub teeb doping yog lwm txoj hauv kev los ua kom lub zog tawg ntawm BCD nce ntxiv. Nws feem ntau siv ob chav diffused drain DDD (ob chav Doping Drain) thiab lub teeb doped drain LDD (lightly Doping Drain). Hauv thaj chaw DMOS drain, thaj chaw N-hom drift ntxiv rau hloov qhov kev sib cuag thawj zaug ntawm N+ drain thiab P-hom substrate mus rau qhov kev sib cuag ntawm N-drain thiab P-hom substrate, yog li ua rau lub zog tawg ntau ntxiv.

2. Kev taw qhia BCD muaj zog heev

Qhov voltage ntawm high-power BCD yog 40-90V, thiab nws feem ntau yog siv rau hauv cov khoom siv hluav taws xob hauv tsheb uas xav tau kev tsav tsheb tam sim no siab, voltage nruab nrab thiab cov circuits tswj yooj yim. Nws cov yam ntxwv xav tau yog kev tsav tsheb tam sim no siab, voltage nruab nrab, thiab cov circuits tswj feem ntau yooj yim.

3. Kev taw qhia BCD siab ceev

BCD ceev ceev, qhov voltage ntau yog 5-50V, thiab qee cov khoom siv hluav taws xob hauv tsheb yuav ncav cuag 70V. Ntau thiab ntau qhov nyuaj thiab ntau yam kev ua haujlwm tuaj yeem koom ua ke ntawm tib lub chip. BCD ceev ceev siv qee lub tswv yim tsim qauv modular kom ua tiav cov khoom lag luam sib txawv, feem ntau yog siv rau hauv cov ntawv thov hluav taws xob hauv tsheb.

Cov ntawv thov tseem ceeb ntawm BCD txheej txheem

Cov txheej txheem BCD siv dav hauv kev tswj hwm lub zog (kev tswj hwm lub zog thiab roj teeb), lub tshuab tsav zaub, cov khoom siv hluav taws xob hauv tsheb, kev tswj hwm kev lag luam, thiab lwm yam. Cov chip tswj hwm lub zog (PMIC) yog ib qho ntawm cov hom tseem ceeb ntawm cov chips analog. Kev sib xyaw ua ke ntawm cov txheej txheem BCD thiab SOI thev naus laus zis kuj yog qhov tseem ceeb ntawm kev txhim kho cov txheej txheem BCD.

VET-Tuam Tshoj tuaj yeem muab cov khoom graphite, softrigid felt, silicon carbide qhov chaw, cvD silicon carbide qhov chaw, thiab sic / Tac coated qhov chaw hauv 30 hnub.
Yog tias koj xav tau cov khoom lag luam semiconductor saum toj no, thov tsis txhob yig tiv tauj peb thawj zaug.

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