Lub viav vias nws tus kheej muaj cov kab mob parasitic rau hauv av.Yog hais tias txoj kab uas hla ntawm qhov sib cais ntawm lub hauv pem teb txheej ntawm lub qhov los ntawm lub qhov yog paub tias yog D2, txoj kab uas hla ntawm lub qhov los ntawm lub qhov ncoo yog D1, lub thickness ntawm lub PCB board yog T, thiab lub dielectric tsis tu ncua ntawm lub board substrate. yog ε, Parasitic capacitance ntawm lub via yog kwv yees li C = 1.41 ε TD1 / (D2-D1)
Lub ntsiab cuam tshuam ntawm parasitic capacitance ntawm lub Circuit Court tshwm sim los ntawm vias yog tias nws prolongs lub teeb liab lub sij hawm thiab txo qhov ceev ntawm Circuit Court.Piv txwv li, rau lub rooj tsavxwm PCB nrog lub thickness ntawm 50 Mil, yog ib tug vias nrog ib tug puab txoj kab uas hla ntawm 10 Mil thiab ib tug ncoo txoj kab uas hla ntawm 20 Mil, thiab qhov kev ncua deb ntawm lub ncoo thiab cov tooj liab nyob rau hauv av yog 32 Mil. , peb tuaj yeem kwv yees kwv yees tus kab mob parasitic capacitance ntawm vias siv cov qauv saum toj no raws li hauv qab no: C = 1.41 x 4.4x 0.050 x 0.020 / (0.032-0.020) = 0.517pF, Lub sij hawm nce kev hloov pauv tshwm sim los ntawm qhov capacitance yog: T10-90 = 2.2C (Z0/2) = 2.2x0.517x (55/2) = 31.28ps.Los ntawm cov txiaj ntsig no, nws tuaj yeem pom tau tias txawm hais tias tus kab mob parasitic capacitance ntawm ib leeg tuaj yeem tsis muaj qhov cuam tshuam tseem ceeb ntawm kev ua kom qis qis, kev ceev faj yuav tsum tau siv yog tias vias siv ntau zaus hauv kev xaim rau interlayer hloov.
Nrog rau cov kab mob parasitic capacitance nyob rau hauv lub via, kuj muaj parasitic inductance.Cov kab mob parasitic series inductance tsis muaj zog rau kev koom tes ntawm lub bypass capacitance thiab tsis muaj zog lim dej ntawm tag nrho lub zog.Cov mis hauv qab no tuaj yeem siv los xam qhov kwv yees kwv yees tus kab mob parasitic inductance ntawm:
L = 5.08h [ln (4h / d) + 1], qhov twg L yog hais txog qhov inductance ntawm lub qhov, h yog qhov ntev ntawm lub qhov, thiab d yog txoj kab uas hla ntawm lub hauv paus drilling qhov.Los ntawm kev sib npaug, nws tuaj yeem pom tau tias txoj kab uas hla ntawm lub viav vias muaj qhov cuam tshuam me me rau ntawm qhov inductance, thaum qhov ntev ntawm lub viav vias muaj qhov cuam tshuam loj tshaj plaws ntawm qhov inductance.Siv cov piv txwv saum toj no, qhov inductance ntawm qhov tuaj yeem suav ua L = 5.08x0.050 [ln (4x0.050/0.010) + 1] = 1.015nH.Yog tias lub sijhawm nce ntawm lub teeb liab yog 1ns, ces nws qhov sib npaug impedance loj yog: XL = π L / T10-90 = 3.19 Ω.
Hauv cov ntsiab lus:
Xaiv lub PCB thinner yog qhov zoo rau kev txo cov kab mob parasitic
Sim tsis txhob hloov cov khaubncaws sab nraud povtseg lossis siv cov vias tsis tsim nyog rau kev teeb tsa
Laum qhov ze ntawm lub hwj huam mov thiab hauv av, thiab qhov luv thiab tuab ntawm cov hlua ntawm lub qhov thiab cov pins, qhov zoo dua
Muab cov qhov hauv av ntau nyob ze ntawm lub teeb liab hloov txheej los muab qhov ze tshaj plaws rau lub teeb liab
Thaum ua cov khoom siv kho qhov muag fiber ntau, xws li optical module,ONU, optical fiber module, OLT module, thiab lwm yam., koj yuav tsum xav txog qhov cuam tshuam ntawm vias ntawm bosa, kis qhov muag daim duab, kev ploj tuag piv, thiab lwm yam, los yog qhov cuam tshuam ntawm kev txais rhiab heev.
Cov saum toj no yog cov ntsiab lus luv luv ntawm "Introduction to Key Parameters of BOSA - via size (II)", uas tuaj yeem siv los ua ib qho kev siv.Peb lub tuam txhab muaj ib pab neeg ua haujlwm muaj zog heev thiab tuaj yeem muab cov kev pabcuam tshaj lij rau cov neeg siv khoom.Tam sim no, peb lub tuam txhab muaj ntau yam khoom: ntseonu, kev sib txuas lus kho qhov muag module, optical fiber module, sfp optical module, olt khoom, Ethernet hloov thiab lwm yam khoom siv network.Yog tias koj xav tau, koj tuaj yeem kawm paub ntxiv txog lawv.
