Dab tsi yog PCB Impedance

Nyob rau hauv ib lub voj voog nrog resistors, inductors, thiab capacitors, qhov kev tiv thaiv rau alternating tam sim no hu ua impedance. Impedance feem ntau sawv cev los ntawm Z, uas yog tus lej nyuaj. Qhov tiag tiag yog hu ua tsis kam, thiab qhov xav txog yog hu ua reactance. Qhov tsis kam ntawm capacitance rau alternating tam sim no hauv Circuit Court yog hu ua reactance. Kev tawm tsam yog hu ua reactance. Qhov ntsuas ntawm impedance yog ohm.

Dab tsi yog hom impedance?

(1) Cov yam ntxwv impedance
Hauv cov khoom siv hluav taws xob xws li khoos phis tawj thiab kev sib txuas lus wireless, lub zog xa mus rau hauv PCB Circuit Court yog lub teeb liab yoj square (hu ua mem tes) tsim los ntawm qhov hluav taws xob thiab lub sijhawm, thiab qhov kev tawm tsam nws ntsib yog hu ua yam ntxwv impedance.

(2) Txawv impedance
Tus neeg tsav tsheb inputs ob lub teeb liab zoo tib yam waveforms nrog opposite polarities, uas yog kis los ntawm ob kab sib txawv raws li, thiab ob tug sib txawv signals raug rho tawm ntawm qhov kawg tau txais. Differential impedance yog impedance Zdiff ntawm ob lub xov hlau.

(3) Odd hom impedance
Thawj ntawm ob kab muaj tib lub impedance ZOO rau hauv av.

(4) Txawm hom impedance
Tus tsav tsheb inputs ob lub teeb liab zoo tib yam waveforms nrog tib polarity, thiab thaum ob kab txuas ua ke, impedance ZCOM.

(5) Hom hom impedance
Impedance ZOE yog ib qho ntawm ob kab rau hauv av. Ob txoj kab muaj tib tus nqi impedance, feem ntau ntau dua li qhov khib-hom impedance.

Vim li cas PCB board xav tau impedance?
PCB Circuit Board impedance yog hais txog qhov tsis kam ntawm qhov tsis kam thiab reactance, thiab thaiv cov nyhuv ntawm kev hloov tam sim no. Kev ua haujlwm impedance yog qhov tseem ceeb hauv PCB Circuit Board tsim khoom. Cov laj thawj yog raws li nram no:

1. Cov kab PCB (hauv qab ntawm lub rooj tsavxwm) yuav tsum xav txog kev teeb tsa ntawm cov khoom siv hluav taws xob, hluav taws xob conductivity thiab cov teeb liab kis tau tus mob thaum ntsaws, yog li qhov qis impedance, qhov zoo dua, qhov resistivity yuav tsum qis dua 1 × ib square centimeter; 10 - 6.

2. Nyob rau hauv cov txheej txheem ntawm PCB Circuit Court board, nws yuav tsum mus los ntawm kev tsim cov txheej txheem xws li tooj liab sinking, electroless tin plating (los yog tshuaj plating, los yog thermal spray tin), connector welding, thiab lwm yam, thiab cov ntaub ntawv siv nyob rau hauv cov kev sib txuas. yuav tsum xyuas kom meej lub resistivity ntawm hauv qab kom ntseeg tau tias tag nrho impedance ntawm lub Circuit Court board yog tsawg txaus kom tau raws li qhov yuav tsum tau ntawm cov khoom ua hauj lwm kom zoo.

3. PCB Circuit board tin plating yog qhov teeb meem feem ntau nyob rau hauv tag nrho cov khoom siv hluav taws xob, thiab nws yog qhov txuas tseem ceeb uas cuam tshuam rau impedance. Qhov loj tshaj qhov tsis zoo ntawm electroless tin plating txheej yog qhov yooj yim hloov xim (ob qho tib si yooj yim rau oxidize thiab yaj), brazing tsis zoo, uas yuav ua rau nyuaj rau soldering lub Circuit Court board, siab impedance, ua rau tsis zoo conductivity los yog tsis ruaj tsis khov kev ua tau zoo. tag nrho lub rooj tsavxwm.

4. Yuav muaj ntau yam teeb liab nyob rau hauv tus neeg xyuas pib ntawm PCB Circuit Board. Thaum tus nqi sib kis tau nce, nws zaus yuav tsum tau nce ntxiv. Yog hais tias cov kab nws tus kheej txawv los ntawm cov yam xws li etching, lamination thickness, thiab kab dav, ces nws yuav ua rau cov kev hloov nyob rau hauv lub kuj, distort lub teeb liab, thiab ua rau ib tug txo nyob rau hauv kev ua tau zoo ntawm lub Circuit Court board, yog li nws yog tsim nyog. tswj tus nqi impedance nyob rau hauv ib tug tej yam.

Beton tau cog lus los muab cov neeg siv khoom nrog ntau txheej txheej txheej txheej txheej txheem kev pabcuam tshwj xeeb thiab daws cov teeb meem ntawm kev lag luam ntau txheej pawg thawj coj ua. Cov neeg siv tau txais tos tuaj sab laj.

Nrhiav peb rau kev cai khoom siv tes ua

1. Txhawb nqa 1-14 cov khaubncaws sab nraud povtseg me me thiab nruab nrab batch xaj, thiab sab laj cov neeg siv khoom rau ntau txheej;
2. tuaj yeem ua HDI qhov muag tsis pom kev faus qhov;
3. Lub rooj tsavxwm siv Kingboard A-qib pawg thawj coj saib (KB-6164), uas tuaj yeem siv los ua lub rooj tsavxwm tsis muaj halogen;
4. Qhov siab tshaj plaws yuav yog ib 'meter';
5. Paj yeeb, pob tshab, ntshav thiab lwm yam xim xim;
6. Kev them nyiaj yug tooj liab thickness 10oz, qhov tooj liab 35μm;
7. Lamination qauv tuaj yeem hloov kho rau ntau txheej boards;
8. Txhawb ntau theem impedance txuam;
9. Copper-clad board ntug, ob-xim number case, qhov (socket) qhov, countersunk qhov, square groove, stepped qhov, stepped zawj, npib tsib xee-palladium-kub thiab lwm yam txheej txheem tshwj xeeb;
10. PCBA tuaj yeem muab tso rau hauv ib txheej, thiab tuaj yeem muab tso rau ntawm ob sab;