Lub hom phiaj tseem ceeb ntawm kev ua tiav tsheb qib impedance qauv rau 77GHz millimeter yoj radar Rogers siab zaus PCB yog 50 Ω ib qho kawg / 100 Ω qhov sib txawv impedance kam rau ua tsawg dua lossis sib npaug rau ± 5%, nrog impedance drift tswj nyob rau hauv ± 35% tag nrho cov℃26262 ASIL-B thiab siab dua cov kev xav tau kev nyab xeeb.
Cov ntaub ntawv txheeb cais ntawm txoj kev npaj no yog raws li lub tsheb loj mounted ntev-ntau 77GHz radar ntau lawm project, thiab tag nrho cov tsis tau raws li cov IPC-6012 Class 3 txais qauv raws li IATF 16949 system.
Rogers high-frequency substrate xaiv thiab impedance yooj yim tswj
Core benchmark khoom: Rogers RO3003 yog qhov zoo dua, nrog Dk ntawm 3.00 ± 0.04, Df tsawg li 0.0013 ntawm 77GHz, thiab TCDk ntawm tsuas yog -3ppm / degree, xauv hauv dielectric qhov ruaj khov ntawm qhov chaw.
Tus nqi siab tshaj lwm txoj kev daws teeb meem: Xaiv RO4835 / RO4830 Plus, sib haum nrog FR-4 cov txheej txheem ib txwm muaj, nrog rau Dk kam rau ua tsawg dua lossis sib npaug rau ± 0.05, txo cov nqi tsim khoom tag nrho ntau dua 25%.
Copper foil xaiv yuav tsum tau siv: VLP / HVLP ultra-low profile tooj liab ntawv ci yuav tsum tau siv, Rz Tsawg dua los yog sib npaug rau 3μm, Hloov mus rau qhov tob tob ntawm daim tawv nqaij tsuas yog 0.24 μ m ntawm 77GHz, tshem tawm cov impedance drift ntxiv los ntawm cov neeg xyuas pib tawg.
Stacking thiab impedance simulation rau cov qauv tsim
Stacked qauv: Txais Rogers dual core board qauv, siv nruab nrab ntawm RF impedance kab yog tag nrho cov muab los ntawm ib tug ruaj khov core board, zam lub thickness fluctuation ntawm nruab nrab tshwm sim los ntawm uneven adhesive flow nyob rau hauv PP semi cured nplooj ntawv.
Simulation calibration: Siv Polar SI9000 impedance xam cov cuab yeej los import cov ntsuas Dk tus nqi kho tus qauv rau txhua pawg ntawm cov laug cam, thiab tsis tuaj yeem siv ncaj qha rau cov kev ntsuas dav dav ntawm FR-4.
Reserve margin: Thaum lub sij hawm tsim qauv, tso tawm "kab dav ± kam rau ua → impedance fluctuation range" ncaj qha, thiab sau tus nqi etching nyiaj ntawm 8% ~ 12% rau hauv EDA cov cai ua ntej kom tsis txhob muaj impedance sib txawv los ntawm cov kab trapezoidal cross-section.
Micro scale txheej txheem tswj ua tiav kev ua siab ntev
Kab raug: Txais LDI laser direct sau + nqus etching txheej txheem, ntsuas kab dav kam rau ua yog tswj nyob rau hauv ± 0.008mm, deb superior rau kev lag luam yuav tsum tau ntawm ± 0.01mm.
Medium thickness tswj: Qhov sib txawv ntawm RF txheej nruab nrab thickness yog nruj me ntsis tswj nyob rau hauv ± 0.01mm, thiab cov impedance tseem ceeb kab yog txwv tsis pub muab tso rau hauv lub 5 hli cheeb tsam nyob ib ncig ntawm lub board ntug kom tsis txhob muaj cov thickness ntawm lub pressed ntug.
Los ntawm kev kho lub qhov: Tag nrho RF los ntawm qhov tau txais cov cuab yeej rov qab drilling, thiab cov seem seem ntev yog tswj tsis pub dhau 0.2 hli txhawm rau tshem tawm cov kev hloov hauv zos impedance los ntawm lub qhov seem seem.
Tsheb specification qib kev txheeb xyuas thiab pawg ntau lawm kev tshuaj xyuas tag nrho
Kev ntsuam xyuas impedance: Txhua lub vaj huam sib luag los nrog kev sib koom ua ke ntawm impedance, thiab 100% kev tshuaj xyuas tag nrho yog ua los ntawm TDR lub sij hawm-domain reflectometer nrog lub sijhawm nce tsawg dua lossis sib npaug li 35ps. Yam tsawg kawg 5 impedance cov ntsiab lus yog sau los ntawm txhua lub vaj huam sib luag.
Kev pov thawj ntawm ib puag ncig kev ntseeg tau: Tom qab ua tiav 1000 qhov kub thiab txias los ntawm -40℃mus rau 150 degree, qhov impedance increment drift tsawg dua lossis sib npaug li 0.5%, ua tau raws li qhov yuav tsum tau ua ntawm AEC-Q200 tsheb specifications.
Kev xa raws: Xa cov ntaub ntawv ua tiav PPAP Qib 3 nrog rau cov khoom, suav nrog Dk cov ntaub ntawv xeem rau txhua pawg ntawm pawg thawj coj saib, impedance SPC cov ntaub ntawv txheeb cais (CPK Ntau dua lossis sib npaug rau 1.33), ua tau raws li qhov yuav tsum tau ua ntawm Tier 1 cov tuam txhab tsheb.
Loj ntau lawm xeem ua raws li rooj plaub
Ib qho kev xa mus rau qhov ntev 77GHz radar project tau txais Rogers RO3003 0.127mm 4-txheej tag nrho-frequency board scheme. Qhov kawg ntsuas impedance ntau yog 49.2 Ω ~ 51.3 Ω, nrog rau kev kam rau siab tswj hauv ± 3%. Tus kav hlau txais xov rov qab poob mus txog -18dB@77GHz Lub batch yield tus nqi tseem nyob ruaj khov ntawm ntau dua 97.2%.