Tsev > Xov xwm > Ntsiab lus

Txoj Kev Ntaus Ntaus Tus Qauv Sib Cais Rau CMOS Analog Integrated Circuit Layout Design

Jan 17, 2018

Vim lub uncertainties thiab random yuam los yog gradient yuam, ib co ntawm cov hlab uas yog tib yam nyob rau hauv kev tshawb xav thiab ua tau yog deviant yog tsim nyob rau hauv tus txheej txheem ntawm integrated circuit processing. Qhov kev sib txawv no hu ua device mismatch. Cov yam ntxwv ntawm cov analog circuits yog zoo heev los ntawm cov qauv siv mismatch. Qhov kev piav qhia meej ntawm cov analog circuits yog ib qho tseem ceeb ntawm qhov tsim cov qauv ntawm analog. Nrog kev nruam ntawm kev siv tshuab thev naus laus zis thiab lub zuj zus ntawm kev tsim qhov dav, kev faib cov khoom siv hluav taws xob thiab hluav taws xob tsis ua los ntawm kev faib khoom ntawm cov txheej txheem tsis ncaj qha ua rau kev siv mismatch thiab yield yield. Yog li ntawd, qhov kev tivthaiv tsis raws cai los ntawm kev faib khoom ntawm tus txheej txheem tsis yog ib qho tseem ceeb uas yuav tsum tau muab coj los tso rau hauv txheej txheem tsim qauv tsim. Daim ntawv no qhia txog cov kev cai tsim qauv ntawm kev tsim cov qauv kev sib txuas ntawm analog, thiab qhia txog cov kev txawj thiab cov qauv ntawm kev sib txuas, xws li transistors, resistors thiab capacitors, hauv analog Circuit Court layout tsim.


1. Tsim cov qauv kev sau ntawv yooj yim

Lub CMOS analog Circuit Court tsuas yog ua tau ib txhia qhov tseeb qhov tseeb thiab qhov teeb meem tam sim no. Hauv cov circuits analog, muaj qee qhov kev kub nyhiab thiab qhov teeb meem loj tam sim no. Cov khoom ntawm qee qhov suab nrov ntawm tej qhov cim tseg yog qhov tseem ceeb ntawm cov qauv tsim hluav taws xob. Tib lub sij hawm, qee qhov analog circuits tau tsim nyob rau hauv cov kev taw qhia ntawm tsawg voltage, me me tam sim no thiab kev kub ceev tom qab nkag mus rau hauv txoj kev sib sib zog nqus submicron. Yog li ntawd, yuav ua li cas kos qhov layout pes tsawg los phim simulation ntawm analog Circuit Court ua tseem ceeb heev. Hauv daim ntawv no, qhov yooj yim txuam hom raj, MOS raj, tsis kam thiab kev ua haujlwm hauv qhov tsim ntawm analog Circuit Court layout yuav raug qhia ua ntej.


1.1 Ntaus lub teeb txuam

Cov kev cai sib txuam pab tau cov neeg tsim kev xaav kom tiav qhov ntev thiab ntev ntawm transistors nyob rau hauv analog circuits, thiab yog qhov tseem ceeb thiab qhov muaj peev xwm ua qhov tseem ceeb, yog li ntawd lub nti ntawm analog circuits muaj kev ua haujlwm zoo heev.


1.1.1 txoj cai sib txuam

Cov kev cai sib txuam ntawm cov qauv thiab kev coj ntawm cov analog Circuit Court layout yog tib yam, thiab qhov teeb tsa ntawm qee tus cwj pwm kuj yuav tsum tau ua raws li cov kev cai ntawm qhov kev sib hloov. Feem ntau, cov qauv kev tsim ntawm kev sib txuas yuav tsum raug pom zoo hauv cov hauv qab no:

(1) Eeem loj: qhov tsis zoo ntawm tus me me ntaus ntawv ua rau qhov sib txawv ntawm lub cuab yeej. Nce zuj zus tuaj yeem ua rau qhov sib piv ntawm ob lub ntsiab lus. Tab sis thaum qhov loj me loj heev, nws yuav ua rau kom muaj qee yam kev phom sij, xws li kev muaj peev xwm loj hlob.

(2) Kev Taw Qhia: qhov sib txawv ntawm cov txheej txheem qhov sib txawv (diffusion gradient, kub gradient, lub npog ntsej muag txawv txav, thiab lwm yam) yuav ua rau kev sib deev ntawm lub cuab yeej. Thaum twg qhov kev tivthaiv nyob ze thiab cov kev taw qhia yuav zoo ibyam, qhov kev ua tsis haum ntawm qhov kev yuam kev hauv kev yuam kev tuaj yeem raug txo kom tsawg. Qhov kev sib txuam zoo tshaj plaws yuav tsum muaj tib hom, tib yam loj, nruj me thiab qhov kev taw qhia tib yam.

(3) Kub: qhov muaj zog ntawm lub hwjchim cov ntsiab lus ntawm chips yuav ua rau mismatch ntawm cov khoom, vim hais tias cov hluav taws xob dissipation ntawm loj resistors lossis loj loj li yuav ua rau cov gradients kub ntawm lub nti. Piv txwv, qhov sib npaug ntawm qhov khoom siv hluav taws xob siab yuav yog ob peb qib siab tshaj li lwm cov khoom siv, thiab qhov rov qab tam sim no ntawm tus bipolar transistor yog ib qho tseem ceeb nyob ntawm qhov kub thiab txias. Vim li no, cov khoom siv uas yuav tsum tau siv rau hauv qhov tsim tsim yuav tsum sib npaug zos, qhov tshwj xeeb tshaj yog rau cov khoom tseem ceeb hauv Circuit Court, xws li qhov sib txawv ntawm qhov kuaj tawm.

(4) Tiv tauj lub qhov chaw: tej zaum qhov chaw nyob ntawm lub cuab yeej yuav phim qhov phem, raws li pom hauv daim duab, qhov kev ua haujlwm tsis zoo sib xws, thaum qhov sib chwv sib txawv ntawm cov txheej txheem theem, kev ua haujlwm ntxiv, txo qis, ua rau muaj ob qhov sib txawv ntawm qhov sib txig sib txawv qhov txawv ntawm qhov tsim, kom tsis txhob siv daim ntawv no ua haujlwm.

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(5) Hlau hlau: xaiv qhov kev xav thiab qhov txawv ntawm lub teeb, kom txo qhov sib txawv ntawm cov txheej txheem nrab, qhov teeb meem nyob ib ncig ntawm cov nuj nqis tseem ceeb yuav tsum sib npaug sib npaug, yog li ntawd kom tsis txhob muaj qhov loj ntawm cov cim tseem ceeb cuam tshuam los ntawm kev raug.


Piv txwv, hauv cov transistor yuav tsum muaj cov khoom sib txig sib luag kom tsis txhob cia hlau xaim los ntawm thaj chaw ua haujlwm npav; txhuas los ntawm transistor txuam cov ntaub ntawv tsis yog siab, tiam sis qhov yuav tsum tau ntxiv ib (virtual) xaim, kom lub xaim ntawm tib lub sijhawm ntev raws cov channel los ntawm tib qhov chaw nyob hauv txhua qhov kev sib txuas array.