PCB pawg thawj coj saib impedance yog hais txog qhov tsis kam ntawm qhov tsis kam thiab reactance, uas cuam tshuam cov kev hloov tam sim no. Hauv kev tsim cov PCB Circuit Board, kev ua haujlwm impedance yog qhov tseem ceeb. Vim li cas PCB Circuit Boards xav tau impedance?

1. Lub PCB Circuit Court (hauv qab ntawm lub rooj tsavxwm) yuav tsum txiav txim siab ntsaws thiab txhim kho cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob thiab cov teeb liab kis tau tus mob yuav tsum tau txiav txim siab tom qab SMT thaj txuas tom qab. Yog li ntawd, qhov qis impedance, qhov zoo dua, tshwj xeeb tshaj yog lub teeb liab microwave. Rau cov khoom siv, qhov yuav tsum tau muaj kev tiv thaiv yog: tsawg dua 1 & TImes; 10-6 ib square centimeter.

2. Nyob rau hauv cov txheej txheem ntawm cov pcb Circuit Court boards, lawv yuav tsum mus dhau cov txheej txheem xws li tooj liab immersion, tin plating (los yog tshuaj plating, los yog thermal spray tin), connector soldering, thiab lwm yam, thiab cov ntaub ntawv siv nyob rau hauv cov kev sib txuas yuav tsum xyuas kom meej. tias cov resistivity yog tsawg, thiaj li yuav xyuas kom meej lub zuag qhia tag nrho impedance ntawm lub Circuit Court board yog tsawg kom tau raws li cov khoom yuav tsum tau zoo thiab muaj peev xwm ua hauj lwm ib txwm.

Thib peb, tin plating ntawm pcb Circuit Court boards yog qhov feem ntau ua rau muaj teeb meem hauv kev tsim tag nrho cov khoom siv hluav taws xob, thiab nws yog qhov txuas tseem ceeb uas cuam tshuam rau impedance. Qhov loj tshaj ntawm cov txheej txheej electroless yog ib qho yooj yim discoloration (yooj yim rau oxidized los yog deliquescent) thiab tsis zoo solderability, uas yuav ua rau nyuaj soldering ntawm Circuit Court board, siab impedance, tsis zoo hluav taws xob conductivity, los yog instability ntawm tag nrho cov board kev ua tau zoo.

4. Muaj ntau yam teeb liab kis tau tus mob nyob rau hauv lub conductors ntawm lub pcb Circuit Court board. Thaum lub zaus yuav tsum tau nce nyob rau hauv thiaj li yuav nce nws kis tau tus mob npaum li cas, yog hais tias tus Circuit Court nws tus kheej yog txawv vim yam tseem ceeb xws li etching, pawg thickness, hlau dav, thiab lwm yam, lub impedance tus nqi yuav hloov. , Yog li ntawd nws cov teeb liab yog distorted thiab kev ua tau zoo ntawm lub rooj tsav xwm Circuit Court yog degraded, yog li nws yog ib qho tsim nyog los tswj cov impedance tus nqi nyob rau hauv ib tug tej yam ntau yam.