1. Cov txheej txheem txheej txheem
Layout yog raws li qhov yuav tsum tau ntawm cov hluav taws xob schematic thiab qhov loj ntawm cov khoom, cov khoom sib npaug thiab zoo zoo nyob rau hauv PCB, thiab tuaj yeem ua tau raws li qhov xav tau ntawm cov tshuab thiab hluav taws xob ua haujlwm ntawm lub tshuab.Layout tsim nyog lossis tsis tsuas yog cuam tshuam rau kev ua haujlwm thiab kev ntseeg siab ntawm PCB lub rooj sib txoos thiab lub tshuab, tab sis kuj cuam tshuam rau PCB thiab nws cov kev sib dhos ua haujlwm thiab kev saib xyuas cov qib ntawm qhov nyuaj, yog li sim ua cov hauv qab no thaum tsim:
Kev faib tawm ntawm cov khoom sib txawv, tib chav tsev ntawm cov khoom siv hluav taws xob yuav tsum muaj kev sib koom ua ke, thiaj li pab txhawb kev debugging thiab kev saib xyuas.
Cheebtsam nrog kev sib tshuam yuav tsum tau teem kom ze rau ib leeg los pab txhim kho kev sib txuas ntawm kev sib txuas thiab xyuas kom lub sijhawm luv tshaj ntawm kev sib dhos.
Thaum tshav kub kub-sensitive Cheebtsam, qhov kev npaj yuav tsum nyob deb ntawm lub Cheebtsam uas ua kom muaj cua sov ntau.
Cov Cheebtsam uas yuav muaj kev cuam tshuam electromagnetic rau ib leeg yuav tsum tau siv kev tiv thaiv lossis kev cais tawm.
2. Cov cai ntawm kev xaim
Kev xaim yog ua raws li daim duab hluav taws xob schematic, tus neeg xyuas pib lub rooj thiab qhov xav tau ntawm qhov dav thiab qhov sib txawv ntawm cov ntawv luam tawm, xov hlau yuav tsum feem ntau ua raws li cov cai hauv qab no:
Nyob rau hauv qhov chaw ntawm kev ua tau raws li qhov yuav tsum tau ntawm kev siv, kev xaim tuaj yeem yooj yim thaum tsis nyuaj los xaiv qhov kev txiav txim ntawm txoj kev xaim rau ib txheej txheej ob txheej → ntau txheej.
Cov xov hlau nruab nrab ntawm ob daim phiaj sib txuas yog nteg tawm kom luv li sai tau, thiab cov teeb liab rhiab heev thiab cov teeb liab me me ua ntej kom txo qis thiab cuam tshuam ntawm cov teeb liab me me.Lub tswv yim kab ntawm analog circuit yuav tsum tau muab tso rau ib sab ntawm lub hauv av hlau thaiv;tib txheej ntawm hlau layout yuav tsum tau muab sib npaug;qhov chaw conductive ntawm txhua txheej yuav tsum sib npaug kom tiv thaiv lub rooj tsavxwm los ntawm kev sib tsoo.
Cov kab teeb liab hloov cov kev taw qhia yuav tsum mus rau kab pheeb ces kaum los yog du, thiab lub vojvoog loj ntawm curvature yog qhov zoo kom tsis txhob muaj hluav taws xob ua kom pom tseeb, teeb liab xav txog thiab tsim cov impedance ntxiv.
Cov circuits digital thiab analog circuits nyob rau hauv cov xaim yuav tsum tau muab cais kom tsis txhob muaj kev sib cuam tshuam, xws li nyob rau hauv tib txheej yuav tsum yog lub hauv paus system ntawm ob lub circuits thiab lub hwj chim mov system nyob ntawm tej yog nteg nyias, lub teeb liab kab ntawm txawv frequencies yuav tsum tau nteg. nyob rau hauv nruab nrab ntawm av xaim sib cais kom tsis txhob crosstalk.Rau kev sim yooj yim, tus qauv tsim yuav tsum teeb tsa qhov tsim nyog breakpoints thiab cov ntsiab lus xeem.
Circuit Court Cheebtsam grounded, txuas nrog lub hwj chim mov thaum cov kev sib raug zoo yuav tsum tau luv luv li sai tau kom txo tau lub internal kuj.
Cov khaubncaws sab nraud povtseg sab sauv thiab sab qis yuav tsum yog qhov sib npaug rau ib leeg kom txo tau cov coupling, tsis txhob muab cov khaubncaws sab nraud povtseg sab sauv thiab sab qis lossis sib npaug.
High-speed Circuit Court ntawm ntau I / O kab thiab txawv amplifier, sib npaug amplifier circuit IO kab ntev yuav tsum sib npaug kom tsis txhob ncua kev ncua lossis theem hloov.
Thaum cov ntaub so ntswg txuas nrog rau thaj tsam loj ntawm cov khoom siv hluav taws xob, cov hlau nyias nyias ntawm qhov ntev tsis pub tsawg dua 0.5 hli yuav tsum tau siv rau kev sib cais thermal, thiab qhov dav ntawm cov hlau nyias yuav tsum tsis pub tsawg dua 0.13 hli.
Cov xaim ze tshaj plaws rau ntawm ntug ntawm lub rooj tsavxwm, qhov kev ncua deb ntawm ntug ntawm lub rooj tsavxwm yuav tsum siab tshaj 5 hli, thiab cov xaim hauv av tuaj yeem nyob ze ntawm ntug ntawm lub rooj tsavxwm thaum xav tau.Yog tias cov ntawv luam tawm ua tiav yuav tsum tau muab tso rau hauv cov lus qhia, cov xaim los ntawm ntug ntawm lub rooj tsavxwm yuav tsum yog qhov tsawg tshaj qhov kev ncua deb ntawm cov lus qhia qhov tob.
Muab ob npaug rau ntawm lub rooj tsavxwm rau pej xeem cov kab hluav taws xob thiab cov xaim hauv av, kom deb li deb tau, muab tso rau ze ntawm ntug ntawm lub rooj tsavxwm, thiab muab faib rau ntawm lub rooj tsavxwm.Multilayer board tuaj yeem teeb tsa nyob rau hauv txheej txheej txheej ntawm cov khoom siv hluav taws xob thiab txheej hauv av, los ntawm lub qhov metalized thiab cov kab hluav taws xob thiab cov xaim hauv av sib txuas ntawm txhua txheej, txheej txheej sab hauv ntawm thaj tsam loj ntawm cov xaim thiab cov kab hluav taws xob, hauv av hlau yuav tsum tau tsim raws li ib tug net, tuaj yeem txhim kho lub zog sib txuas ntawm cov txheej txheem ntawm multilayer board.
3. Hlau dav
Qhov dav ntawm cov ntawv luam tawm yog txiav txim siab los ntawm kev thauj khoom tam sim no ntawm cov xaim, qhov tso cai kom sov thiab qhov adhesion ntawm cov ntawv ci tooj liab.General luam ntawv board hlau dav ntawm tsis tsawg tshaj li 0.2 hli, lub thickness ntawm 18μm los yog ntau tshaj.Lub thinner cov hlau, qhov nyuaj dua nws yog ua, yog li nyob rau hauv qhov chaw xaim tso cai rau tej yam kev mob, yuav tsum tsim nyog xaiv ib tug dav hlau, cov qauv tsim ib txwm muaj raws li nram no:
Cov kab teeb liab yuav tsum yog tib lub thickness, uas yog qhov tsim nyog rau impedance txuam, qhov dav pom zoo kab dav ntawm 0.2 mus rau 0.3mm (812mil), thiab rau lub zog hauv av, qhov loj ntawm qhov chaw sib dhos yog qhov zoo dua los txo kev cuam tshuam.Rau high-frequency signals, nws yog qhov zoo tshaj plaws los thaiv cov kab hauv av, uas tuaj yeem txhim kho cov nyhuv kis tau tus mob.
Nyob rau hauv high-ceev circuits thiab microwave circuits, tus yam ntxwv impedance ntawm cov kis kab mob, thaum lub dav thiab thickness ntawm cov hlau yuav tsum tau raws li cov yam ntxwv impedance yuav tsum tau.
Hauv kev tsim hluav taws xob hluav taws xob siab, lub zog ceev yuav tsum tau coj mus rau hauv tus account lub sijhawm no yuav tsum coj mus rau hauv tus account cov kab dav, thickness thiab rwb thaiv tsev ntawm cov kab.Yog tias tus neeg xyuas pib sab hauv, qhov kev tso cai tam sim no yog kwv yees li ib nrab ntawm tus neeg xyuas pib.
4. Luam tawm xaim sib nrug
Lub rwb thaiv tsev tiv thaiv ntawm cov ntawv luam tawm ntawm cov khoom siv hluav taws xob yog txiav txim siab los ntawm qhov sib txawv ntawm cov xaim, qhov ntev ntawm cov kab sib txuas ntawm cov xov hlau uas nyob ib sab, cov xov xwm rwb thaiv tsev (xws li substrate thiab huab cua), nyob rau hauv qhov chaw xaim tso cai rau cov xwm txheej, yuav tsum tsim nyog txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau yog txiav txim .
Post lub sij hawm: Feb-18-2022