Hauv ntiaj teb digital niaj hnub no, kev nrawm yog qhov tseem ceeb thiab tseem ceeb uas txhim kho kev ua tau zoo ntawm cov khoom lag luam. Yog li, ntxiv rau qhov nce lub teeb liab nrawm, ntau tus qauv siv hluav taws xob tau ntim nrog ntau qhov kev cuam tshuam nrawm, thiab kev nce qib ntawm teeb liab ua rau PCB kev teeb tsa thiab thaiv lub hauv paus tseem ceeb ntawm kev ua haujlwm tag nrho. Kev tsim kho tshiab ntawm hluav taws xob ntau ntxiv tau ua rau muaj kev xav tau ntau ntxiv rau kev tsim khoom siv hluav taws xob siab ceev PCB thiab kev sib dhos thev naus laus zis zoo tshaj plaws rau cov txheej txheem tseem ceeb ntawm PCB, suav nrog kev xav tau los txo cov suab nrov ntawm PCB. Lub suab nrov ntawm lub rooj tsav xwm luam tawm yog lub hauv paus tseem ceeb cuam tshuam rau kev ua haujlwm ntawm tag nrho cov kab ke. Cov blog no tsom mus rau txoj hauv kev thiab txhais tau tias txo qis suab nrov ntawm PCB ntawm kev kub ceev PCB.

PCB tsim qauv uas ua kom ntseeg tau kev txhim kho yuav tsum muaj qib qis thiab muaj suab nrov nyob hauv pawg thawj coj hauv PCB. PCB tsim yog theem tseem ceeb tseem ceeb kom tau txais kev muaj zog, tsis muaj suab nrov, kev ua haujlwm tau zoo PCB kev sib sau ua ke, thiab PCB tsim tau dhau los ua qhov tseem ceeb. Txog qhov kawg no, yam tseem ceeb suav nrog kev tsim hluav taws xob muaj txiaj ntsig, teeb meem kev sib txuas sib txuas, cov kab mob sib kis, kev tshem tawm thiab cov txheej txheem hauv av kom ua tau zoo PCB tsim. Thawj qhov yog cov txheej txheem rhiab thiab cov txheej txheem ntawm thaiv – av hauv av thiab suab nrov hauv av, tsis muaj peev xwm ua tau, siab Circuit Court impedance, cov kab sib kis thiab cov hlua txuas. Txog qhov xav tau ntau ntawm cov teeb liab nrawm tshaj plaws hauv Circuit Court,

Tsim cov txheej txheem txhawm rau tshem tawm cov suab nrov hauv on-speed PCB

Lub suab nrov hauv PCB tuaj yeem cuam tshuam tsis zoo rau PCB kev ua haujlwm vim qhov hloov pauv ntawm qhov ntsuas hluav taws xob thiab cov duab tam sim no. Nyeem los ntawm qee qhov kev ceev faj kom tsis txhob ua yuam kev uas yuav pab txhim kho kev ua haujlwm thiab tiv thaiv lub suab nrov los ntawm kev kub ceev PCB.

L Txo kev sib tham

Crosstalk yog qhov ua tsis tau zoo thiab siv hluav taws xob sib txuas ntawm cov xov hlau, cov hlua, cov khoom sib txuas cable, thiab cov ntsiab lus cuam tshuam nrog kev faib hluav taws xob hluav taws xob. Crosstalk nyob ntawm qhov ntau ntawm cov txheej txheem kev qhia. Crosstalk tsis tshua muaj tshwm sim thaum cov xov tooj tau hla ib sab. Yog tias cov kab sib txuas sib luag rau ib leeg, kev sib tshuam yuav tshwm sim yog tias ntu tsis khaws cia luv. Lwm txoj hauv kev kom tsis txhob hla hla yog kom txo qhov siab dielectric thiab nce qhov sib nrug ntawm cov xov hlau.

L Cov teeb liab muaj zog muaj kev ncaj ncees

PCB tus kws tshaj lij tsim qauv yuav tsum ua tib zoo txiav txim siab lub teeb liab thiab lub zog ua kom muaj lub luag haujlwm zoo thiab muaj peev xwm sib piv ntawm PCB kev tsim qauv siab. Ib qho ntawm kev tsim kev txhawj xeeb loj ntawm SI-ceev yog qhov raug xaiv ntawm PCB tsim cov kab sib txuas raws qhov tseeb teeb liab nrawm, tsav tsheb IC, thiab lwm yam kev tsim teeb meem uas pab zam PCB hauv lub suab nrov. Teeb liab ceev. Kev muaj hwj chim ncaj ncees (PI) kuj yog ib feem tseem ceeb ntawm cov txheej txheem uas yuav tsum tau ua kom muaj kev kub ceev PCB tsim qauv uas txo cov suab nrov thiab tswj hwm qhov ntsuas hluav taws xob ruaj khov nyob rau ntawm lub ncoo.

L Tiv thaiv qhov chaw vuam txias

Cov txheej txheem vuam tsis raug tuaj yeem ua rau txias txias. Cov pob qij txha txias tuaj yeem ua rau muaj teeb meem xws li qhib tsis xwm yeem, suab nrov zoo li qub thiab lwm yam. Zoo! Txhawm rau tiv thaiv cov teeb meem no, nco ntsoov ua kom sov cov hlau kom raug ntawm qhov kub kom raug. Qhov taub ntawm cov hlau taub yuav tsum tau muab tso rau ntawm qhov sib koom ua ke kom sov nws kom zoo ua ntej thov siv cov laug rau qhov sib koom ua ke. Koj yuav pom melting ntawm qhov kub thiab txias; Cov laug tag npog npog qhov sib koom tes. Lwm txoj hauv kev kom yooj yim vuam siv flux.

L Txo cov hluav taws xob PCB kom ua tiav lub suab qis PCB tsim

Cov txheej txheem laminated ntawm cov kab uas nyob ib sab yog qhov kev xaiv zoo tshaj plaws hauv Circuit Court xaiv kom tsis txhob muaj suab nrov hauv PCB. Lwm yam yuav tsum tau ua ua ntej kom ua tiav lub suab qis PCB tsim thiab txo qis PCB emission muaj xws li tsis tshua muaj kev sib cais, qhov sib ntxiv ntawm cov davhlau ya nyob twg resistors, kev siv decoupling capacitors, kev sib cais ntawm analog thiab digital av txheej, thiab kev sib cais ntawm I / O cov cheeb tsam thiab kaw lub rooj tsavxwm lossis lub teeb liab ntawm lub rooj tsavxwm yog qhov zoo rau cov kev xav tau ntawm cov suab nrov qis-siab ceev PCB.

Ua kom tiav txhua yam ntawm cov txheej txheem saum toj no thiab ua raws li kev tsim tshwj xeeb kev tsim kho raws li qhov yuav tsum tau ua ntawm txhua qhov haujlwm hauv PCB, kev tsim qauv PCB tsis muaj suab nrov tsis paub meej. Txhawm rau kom muaj kev xaiv tsim txaus kom tau txais qhov tsis muaj suab nrov PCB hauv EMS specification, yog vim li cas peb tau npaj ntau txoj hauv kev kom tsis txhob muaj suab nrov ntawm lub rooj tsavxwm ntawm kev kub ceev PCB.