Cov nyhuv ntawm daim tawv nqaij yog ib qho tseem ceeb tshaj plaws ntawm lub cev tshwm sim nyob rau hauv high zaus PCB teeb liab kis tau tus mob. Nws hloov tag nrho cov qauv kev faib tawm tam sim no nyob rau hauv tooj liab ntawv routing, ncaj qha cuam tshuam rau Circuit Court poob, impedance stability, thiab teeb liab kev ncaj ncees. Nws yog ib qho tseem ceeb uas yuav tsum tau ua tib zoo tswj nyob rau hauv siab - zaus PCB tsim.
Lub cev lub cev mechanism ntawm daim tawv nqaij nyhuv
Lub ntsiab txhais: Thaum alternating tam sim no propagates nyob rau hauv ib tug conductor, nws yog cuam tshuam los ntawm electromagnetic induction, thiab tam sim no yuav mloog zoo rau ntawm tus neeg xyuas pib, uas yuav luag tsis muaj tam sim no dhau los ntawm lub hauv paus cheeb tsam ntawm tus neeg xyuas pib.
Kev sib raug zoo ntawm cov zaus thiab qhov tob ntawm daim tawv nqaij: qhov ntau dua, qhov thinner "skin layer" qhov twg tam sim no accumulates. Noj tooj liab conductors ua piv txwv, daim tawv nqaij qhov tob ntawm 100MHz teeb liab yog hais txog 6.6 μ m, thaum tag nrho cov tuab ntawm cov pa PCB 1oz tooj liab ntawv ci mus txog 35 μ m. High zaus tam sim no tsuas yog kis tau nyob rau hauv qhov chaw nyias nyias ntawm cov ntawv ci tooj liab, thiab feem ntau ntawm cov cheeb tsam sab hauv ntawm cov ntawv ci tooj liab tsis ua haujlwm.
Siv rau tooj liab qhov tob ntawm ntau zaus: 0.1175 nti ntawm 10Hz, 0.027 ntiv tes ntawm 10kHz, 0.0027 ntiv tes ntawm 10MHz, thiab tsuas yog 0.00027 ntiv tes ntawm 10GHz.
Qhov tshwj xeeb cuam tshuam rau kev ua haujlwm ntawm cov khoom siv hluav taws xob siab PCB
Qhov tseem ceeb ntawm cov neeg xyuas pib AC poob: Qhov kev ua tau zoo ntawm tus ntoo khaub lig- ntu ntu ntawm qhov tam sim no tau txo qis heev, AC tsis kam ntawm cov xaim hluav taws xob tau nce ntxiv, thiab ntau lub zog tau hloov mus rau hauv thermal zog thaum lub teeb liab kis tau tus mob, ua rau muaj kev cuam tshuam tsis tu ncua ntawm siab - zaus teeb liab amplitude{ thiab yooj yim tshwm sim ntawm wiring tom qab 2} errors.
Subverting lub logic ntawm qis- zaus kab dav tsim: ob npaug ntawm kab dav, ob npaug ntawm tus ntoo khaub lig- ntu ntu ntawm cov xaim, thiab halving DC tsis kam nyob rau hauv tsawg- zaus scenarios; Txawm li cas los xij, nyob rau hauv cov nyhuv ntawm daim tawv nqaij, qhov sib txawv ntawm qhov ua tau zoo ntawm thaj chaw ntawm qhov dav thiab nqaim kab yog txo qis, thiab qhov txo qis hauv kev tiv thaiv yog negligible. Qhov muag tsis pom kev nthuav dav tuaj yeem tsis tuaj yeem txhim kho lub peev xwm nqa tam sim no thiab tseem yuav pov tseg qhov chaw layout.
Ua rau impedance hloov pauv thiab hluav taws xob ntxiv: Thaum muaj kev hloov pauv tam sim ntawm qhov dav ntawm cov hlau thiab cov fab tsis tu ncua, kev faib tawm ntawm daim tawv nqaij tam sim no yuav cuam tshuam, ua rau muaj kev cuam tshuam ntxiv tam sim no, thaum rhuav tshem qhov txuas ntxiv ntawm cov kab xaim impedance, ua rau muaj kev cuam tshuam cov teeb liab, thiab txhim kho cov hluav taws xob tsis tsim nyog, txo EMC kev ua haujlwm.
Kev cuam tshuam cov txiaj ntsig ntawm kev tshem tawm cov teeb liab sib txawv: Cov nyhuv ntawm daim tawv nqaij yuav txhim kho cov hluav taws xob hluav taws xob ntawm ib lub xov hlau. Yog hais tias ob lub xov hlau ntawm cov khub sib txawv muaj cov kab dav sib txawv, qhov poob thiab theem ntawm ob lub teeb liab yuav pom qhov sib txawv tseem ceeb, thiab cov nyhuv hluav taws xob hluav taws xob hluav taws xob tshem tawm thaum pib ua tiav los ntawm kev tsim symmetrical yuav txo qis heev.
Target optimization kev taw qhia nyob rau hauv high zaus PCB tsim
Ua ntej siv cov ntawv tuab tooj liab: Hauv siab - zaus thiab cov xwm txheej tam sim no siab, siv 2oz thiab 3oz tuab cov nplooj ntawv tooj liab nrog cov qauv kab dav dav muab cov hluav taws xob ua haujlwm zoo dua li 1oz nyias tooj liab nrog cov kab dav dav. Nws tuaj yeem ua rau kom muaj txiaj ntsig zoo ntawm cov txheej txheem ntawm daim tawv nqaij thiab txo AC tsis kam thaum txuag qhov chaw layout.
nruj me ntsis tswj cov geometric raug ntawm cov xov hlau: tsim siab - precision etching specifications, tswj tag nrho qhov yuam kev ntawm kab dav li ntawm +/-0.0007 ntiv tes, siv lub kaum sab xis 45℃los yog arc hloov pauv rau cov fab ntawm cov kab, tsis txhob cia li hloov pauv ntawm txoj kab dav vim qhov kev sib tw ntawm txoj kab dav tag nrho, thiab xyuas kom meej tag nrho qhov dav thiab qhov dav.
Ua kom zoo ntawm qhov chaw ntawm cov xaim: Txais qhov tsis tshua muaj roughness tooj liab foil nto kho kom tsis txhob muaj cov qauv ntxhib tooj liab ntawm cov hniav elongating txoj kev sib kis ntawm high- zaus electrons thiab txo lub zog poob los ntawm micro kev sib txhuam.
Kev sib txawv ntawm qhov sib txawv yog nruj me ntsis sib luag: xyuas kom meej tias kab dav, qhov ntev, thiab ib puag ncig tooj liab ib puag ncig ntawm qhov sib txawv ntawm ob lub xov hlau zoo sib xws, cov kab dav dav yog tswj tau nyob rau hauv ib qho me me, tswj qhov poob thiab theem synchronization ntawm ob lub teeb liab, thiab xyuas kom meej qhov sib txawv tshem tawm cov nyhuv.