Dab tsi yog qhov txawv, qhov zoo thiab qhov tsis zoo ntawm yim-txheej board thiab fake yim-txheej board

PCBs yog cov khoom tseem ceeb ntawm cov khoom siv hluav taws xob niaj hnub no, thiab lawv cov qauv tsim thiab kev tsim khoom yog qhov tseem ceeb rau kev ua haujlwm ntawm cov cuab yeej thiab kev ntseeg siab. Hauv PCB tsim, impedance tswj thiab stackup tsim yog ib qho tseem ceeb. Kab lus no yuav delve rau hauv PCB impedance paub, tshawb txog qhov sib txawv ntawm yim-txheej boards thiab fake yim-txheej boards, thiab soj ntsuam lawv qhov zoo thiab qhov tsis zoo.

1. Kev paub yooj yim ntawm PCB impedance
Impedance yog ib qho khoom siv hluav taws xob hauv Circuit Court uas piav qhia txog kev sib raug zoo ntawm qhov tam sim no thiab voltage. Hauv PCBs, kev tswj hwm ntawm impedance yog qhov tseem ceeb rau kev xa xov hluav taws xob ntau zaus, tshwj xeeb tshaj yog nyob rau hauv kev sib txuas lus niaj hnub thiab kev xa cov ntaub ntawv ceev. Kev tswj ntawm PCB impedance yog ua tiav los ntawm kev tsim lub rooj tsavxwm lub hierarchy thiab cov khoom tshwj xeeb xaiv.

2. PCB stackup tsim
PCB stack-up tsim muaj xws li stacking ntau txheej ntawm Circuit Court boards ua ke kom tau raws li cov kev cai hluav taws xob thiab txhua yam. Feem ntau, ib qho PCB hierarchy muaj cov teeb liab, hauv av, thiab lub hwj chim txheej. Cov txheej txheem siab dua PCBs muab kev tsim qauv yooj yim dua thiab kev ua haujlwm hluav taws xob zoo dua.

3. Cov yam ntxwv ntawm yim txheej boards
Ib lub rooj tsav xwm yim txheej yog cov txheej txheem ntau txheej PCB. Nws cov qauv hierarchical raug suav nrog cov teeb liab txheej, txheej hauv av, txheej fais fab thiab txheej dav hlau. Cov qauv no muab kev tswj kom zoo dua impedance, teeb liab kev ncaj ncees thiab electromagnetic compatibility. Yim-txheej boards tau siv dav hauv cov khoos phis tawj ua haujlwm siab, cov khoom siv sib txuas lus thiab lwm cov tshuab hluav taws xob nyuaj.
4. Lub tswvyim ntawm "fake yim-txheej board"
"Fake yim-txheej board" yog hais txog qhov pom ntawm kev siv yim-txheej PCB hauv kev tsim, tab sis qhov tseeb tsuas yog ob peb txheej yog siv rau kev xaim, thiab cov khaubncaws sab nraud povtseg feem ntau muaj cov txheej txheem hluav taws xob thiab cov txheej hauv av. Qhov kev tsim qauv no feem ntau yog tsav los ntawm kev txiav txim siab nqi kom txo tus nqi ntawm PCB kev tsim khoom.
5. Qhov txawv ntawm yim-txheej boards thiab "fake yim-txheej boards"
Kev tswj hwm impedance: Yim-txheej boards ua kom yooj yim dua kom ua tiav qhov kev tswj hwm impedance hauv kev tsim vim tias muaj peev xwm ua tau ntau lub teeb liab txheej thiab cov txheej txheem dav hlau, ua rau cov xaim hloov tau yooj yim dua. Txij li thaum lub "fake yim-txheej board" muaj tsawg txheej, impedance tswj tej zaum yuav nyuaj, tshwj xeeb tshaj yog nyob rau hauv high-frequency daim ntaub ntawv.
Teeb liab kev ncaj ncees: Cov txheej txheem ntau theem ntawm yim txheej pawg thawj coj pab txo qis crosstalk thiab teeb liab attenuation ntawm cov teeb liab pins thiab txhim kho teeb liab kev ncaj ncees. Hauv qhov sib piv, "fake yim-txheej pawg thawj coj saib" tej zaum yuav muaj teeb meem kev ncaj ncees ntau dua nyob rau hauv ib puag ncig siab vim muaj cov teeb liab tsawg dua.
Electromagnetic compatibility: Lub yim-txheej board tsim tau zoo dua tswj hluav taws xob hluav taws xob thiab rhiab heev thiab txo cov electromagnetic cuam tshuam. "Fake yim-txheej board" tej zaum yuav tsis zoo electromagnetic compatibility vim tsis muaj kev sib cais ntawm lub hwj chim mov thiab hauv av txheej.
Tus nqi: "Fake yim-txheej boards" feem ntau muaj kev sib tw ntawm cov nqi tsim khoom vim tias siv cov txheej txheem tsawg dua. Txawm li cas los xij, qhov kev txuag no tuaj yeem los ntawm tus nqi hauv kev ua haujlwm hauv Circuit Court thiab stability.
6. Kev tshuaj xyuas qhov zoo thiab qhov tsis zoo ntawm yim-txheej boards thiab "txheej yim-txheej boards"
(1) Qhov zoo ntawm yim txheej boards
Kev tswj hwm impedance zoo dua: Yim-txheej boards muab kev tswj hwm impedance zoo dua nrog ntau cov teeb liab txheej thiab txheej txheej dav hlau, haum rau kev ua haujlwm siab thiab kev siv ntau zaus.
Superior Signal Integrity: Ntau txheej txheej pab txo cov teeb liab attenuation thiab crosstalk, txhim kho teeb liab kev ncaj ncees.
Zoo dua electromagnetic compatibility: Tsim nyog hierarchical qauv pab tswj electromagnetic hluav taws xob thiab rhiab heev thiab txhim kho electromagnetic compatibility.
(2) Qhov tsis zoo ntawm yim txheej boards
Cov nqi tsim khoom siab dua: Yim-txheej boards muaj cov nqi tsim khoom siab vim lawv cov txheej txheem ntau. Lawv tsim nyog rau cov ntawv thov uas xav tau kev ua haujlwm siab dua thiab txaus siab rau tus nqi siab dua.
(3) Qhov zoo ntawm "fake yim-txheej board"
Cov nqi tsim khoom qis dua: "Fake yim-txheej boards" muaj cov nqi tsim khoom qis vim lawv cov txheej txheem tsawg, ua rau lawv tsim nyog rau cov nqi siv hluav taws xob.
(4) Disadvantages ntawm "fake yim-txheej board"
Kev tswj hwm impedance yog qhov nyuaj: Vim muaj cov txheej txheem me me, kev tswj xyuas impedance yuav nyuaj thiab tsim nyog rau cov ntawv thov uas tsis tas yuav tsum muaj kev tswj hwm impedance siab.
Cov teeb liab tsis zoo tsis zoo thiab kev sib raug zoo ntawm electromagnetic: Tsawg dua cov teeb liab txheej yuav ua rau muaj teeb meem nrog cov teeb liab kev ncaj ncees thiab electromagnetic compatibility, thiab tsim nyog rau cov ntawv thov uas tsis muaj cov kev xav tau siab hauv cov qauv no.

Xaus: Thaum xaiv cov qauv PCB, tus tsim engineers yuav tsum xav txog cov kev xav tau ntawm kev ua haujlwm, cov nqi tsim khoom, thiab daim ntawv thov scenarios. Yim-txheej boards muaj qhov zoo tshaj plaws hauv kev ua haujlwm siab thiab kev siv ntau zaus, tshwj xeeb tshaj yog nyob rau hauv impedance tswj, teeb liab kev ncaj ncees thiab electromagnetic compatibility. "Fake yim-txheej board" yog haum rau cov nqi-sensitive daim ntaub ntawv, tab sis tej zaum yuav txi kev ua tau zoo thiab stability. Cov kws tsim qauv tsim qauv yuav tsum ntsuas cov yam ntxwv no raws li cov kev xav tau tshwj xeeb kom ua tiav qhov zoo tshaj plaws sib npaug ntawm tus nqi / kev ua tau zoo thiab kev ua haujlwm.