Nrog rau kev kho dua tshiab ntawm cov neeg siv khoom, nws maj mam txhim kho mus rau cov kev taw qhia ntawm kev txawj ntse, yog li cov kev cai rau PCB pawg thawj coj saib impedance tau dhau los ua ntau thiab nruj, uas tseem txhawb kev loj hlob tsis tu ncua ntawm impedance tsim tshuab.
Dab tsi yog yam ntxwv impedance?
1. Qhov kev tiv thaiv tsim los ntawm kev sib hloov tam sim no hauv cov khoom muaj feem xyuam nrog cov capacitance thiab inductance.Thaum muaj hluav taws xob teeb liab waveform kis tau tus mob nyob rau hauv tus neeg xyuas pib, qhov kev tiv thaiv nws tau txais yog hu ua impedance.
2. Resistance yog qhov kev tawm tsam uas tsim los ntawm cov khoom siv hluav taws xob ncaj qha, uas muaj feem xyuam rau qhov voltage, resistivity, thiab tam sim no.
Kev siv cov yam ntxwv impedance
1. Siv rau kev xa xov hluav taws xob ceev thiab lub zog hluav taws xob ntau, cov khoom siv hluav taws xob tau muab los ntawm cov ntawv luam tawm yuav tsum muaj peev xwm tiv thaiv kev cuam tshuam thaum lub teeb liab kis tau tus mob, ua kom lub teeb liab tsis zoo, txo qis kev sib kis, thiab ua lub luag haujlwm zoo sib xws.Ua kom tiav, txhim khu kev qha, raug, tsis muaj kev txhawj xeeb, thiab tsis muaj suab nrov kis tau tus mob.
2. Qhov loj ntawm impedance tsis tuaj yeem nkag siab yooj yim raws li qhov loj dua qhov zoo lossis qhov me dua qhov zoo, qhov tseem ceeb yog qhov sib txuam.
Tswj cov yam ntxwv ntawm cov yam ntxwv impedance
Lub dielectric qhov tsis tu ncua ntawm daim ntawv, lub thickness ntawm dielectric txheej, kab dav, tooj liab thickness, thiab lub thickness ntawm solder daim npog qhov ncauj.
Kev cuam tshuam thiab kev tswj ntawm lub npog ntsej muag
1. Lub thickness ntawm lub npog ntsej muag muaj qhov cuam tshuam me me ntawm qhov impedance.Lub thickness ntawm lub npog ntsej muag nce 10um, thiab tus nqi impedance hloov tsuas yog 1-2 ohms.
2. Hauv kev tsim, muaj qhov sib txawv loj ntawm qhov kev xaiv ntawm lub hau npog thiab tsis muaj lub hau npog npog, ib qho kawg 2-3 ohms, thiab qhov sib txawv 8-10 ohms.
3. Nyob rau hauv zus tau tej cov impedance boards, lub thickness ntawm solder daim npog qhov ncauj yog ib txwm tswj raws li qhov yuav tsum tau ntau lawm.
Kev ntsuas impedance
Txoj kev yooj yim yog txoj kev TDR (Time Domain Reflectometry).Lub hauv paus ntsiab lus tseem ceeb yog tias lub ntsuas hluav taws xob tso tawm lub teeb liab mem tes, uas yog folded rov qab los ntawm qhov ntsuas ntawm lub rooj tsav xwm Circuit Court los ntsuas qhov kev hloov pauv ntawm tus yam ntxwv impedance ntawm emission thiab folded rov qab.Tom qab lub khoos phis tawj txheeb xyuas cov yam ntxwv impedance, qhov tso zis yam ntxwv impedance yog cov zis.
Kev daws teeb meem impedance
1. Hais txog kev tswj tsis tau ntawm impedance, kev tswj cov kev xav tau tuaj yeem ua tiav los ntawm kev sib koom ua ke hauv kev tsim khoom.
2. Tom qab lamination hauv kev tsim khoom, lub rooj tsavxwm raug txiav thiab tshuaj xyuas.Yog tias qhov tuab ntawm qhov nruab nrab raug txo, txoj kab dav tuaj yeem raug txo kom tau raws li qhov yuav tsum tau ua;Yog hais tias lub thickness yog tuab heev, cov tooj liab yuav thickened los txo tus nqi impedance.
3. Nyob rau hauv qhov kev xeem, yog tias muaj ntau qhov sib txawv ntawm qhov kev xav thiab qhov tseeb, qhov muaj peev xwm loj tshaj plaws yog tias muaj teeb meem nrog kev tsim qauv engineering thiab qhov kev xeem strip tsim.
Post lub sij hawm: Nov-19-2021