Qhov zoo tshaj plaws PCB tsim qauv: Rau yam uas yuav tsum tau xav txog thaum xaiv cov khoom PCB raws li kev ntim khoom. Tag nrho cov piv txwv hauv tsab xov xwm no tau tsim los siv MulTIsim tsim ib puag ncig, tab sis tib lub tswv yim tseem siv tau txawm tias muaj cov cuab yeej EDA sib txawv.

1. Xav txog kev xaiv cov khoom ntim khoom

Nyob rau hauv tag nrho cov schematic daim duab theem, cov khoom ntim khoom thiab cov qauv kev txiav txim siab av uas yuav tsum tau ua nyob rau hauv lub layout theem yuav tsum xav txog. Qee cov lus qhia los xav txog thaum xaiv cov khoom raws li cov khoom ntim tau muab hauv qab no.

Nco ntsoov tias lub pob muaj xws li cov khoom siv hluav taws xob sib txuas thiab cov khoom siv qhov ntev (X, Y, thiab Z) ntawm cov khoom, uas yog, cov duab ntawm lub cev tivthaiv thiab cov pins uas txuas rau PCB. Thaum xaiv cov khoom, koj yuav tsum xav txog tej yam mounting lossis ntim cov kev txwv uas yuav muaj nyob rau saum thiab hauv qab txheej ntawm PCB zaum kawg. Qee cov khoom siv (xws li polar capacitors) yuav muaj kev txwv siab hauv lub taub hau, uas yuav tsum tau xav txog hauv cov txheej txheem xaiv cov khoom. Thaum pib ntawm kev tsim, koj tuaj yeem ua ntej kos ib qho yooj yim Circuit Court board thav duab duab, thiab tom qab ntawd muab qee qhov loj lossis cov khoom tseem ceeb (xws li cov khoom sib txuas) uas koj npaj siv. Nyob rau hauv txoj kev no, kev pom kev pom ntawm lub rooj tsav xwm hauv Circuit Court (tsis muaj xov) tuaj yeem pom qhov xav tau thiab nrawm, thiab qhov chaw txheeb ze thiab qhov siab ntawm lub rooj tsav xwm Circuit Court thiab cov khoom tuaj yeem muab qhov tseeb. Qhov no yuav pab xyuas kom meej tias cov khoom tuaj yeem muab tso rau hauv cov ntim khoom zoo (cov khoom siv yas, chassis, chassis, thiab lwm yam) tom qab lub PCB sib dhos. Hu rau 3D saib ua ntej hom los ntawm cov cuab yeej ntawv qhia zaub mov los xauj tag nrho lub rooj tsav xwm Circuit Court.

Cov qauv av qhia txog cov av tiag tiag lossis los ntawm cov duab ntawm cov khoom siv soldered ntawm PCB. Cov qauv tooj liab no ntawm PCB kuj muaj qee cov ntaub ntawv yooj yim. Qhov luaj li cas ntawm cov qauv av yuav tsum muaj tseeb kom paub tseeb tias qhov tseeb soldering thiab qhov tseeb txhua yam thiab thermal kev ncaj ncees ntawm cov khoom sib txuas. Thaum tsim cov txheej txheem PCB, koj yuav tsum xav txog yuav ua li cas lub rooj tsav xwm Circuit Court yuav raug tsim, lossis yuav ua li cas cov ntaub qhwv yuav raug soldered yog tias nws yog manually soldered. Reflow soldering (lub flux yog melted nyob rau hauv ib tug tswj kub qhov cub) muaj peev xwm lis ntau yam ntawm nto mount li (SMD). Wave soldering feem ntau yog siv los solder sab nraub qaum ntawm lub rooj tsav xwm hauv Circuit Court los txhim kho cov khoom siv hauv lub qhov, tab sis nws tuaj yeem ua tau qee qhov chaw mounted rau sab nraum qab ntawm PCB. Feem ntau, thaum siv cov thev naus laus zis no, cov khoom siv hauv qab saum npoo av yuav tsum tau teem rau hauv ib qho kev taw qhia tshwj xeeb, thiab txhawm rau hloov kho cov txheej txheem no, cov ntaub qhwv yuav tsum tau hloov kho.

Kev xaiv ntawm cov khoom tuaj yeem hloov pauv thaum lub sijhawm tsim tag nrho. Kev txiav txim siab seb cov khoom siv twg yuav tsum tau siv plated los ntawm qhov (PTH) thiab qhov twg yuav tsum tau siv cov thev naus laus zis saum npoo av (SMT) thaum ntxov ntawm cov txheej txheem tsim yuav pab txhawb kev npaj tag nrho ntawm PCB. Cov yam tseem ceeb uas yuav tsum tau txiav txim siab suav nrog tus nqi khoom siv, qhov muaj nyob, qhov chaw siv khoom siv ceev, kev siv hluav taws xob, thiab lwm yam. Los ntawm kev tsim khoom, cov khoom siv saum npoo av feem ntau pheej yig dua li cov khoom siv los ntawm lub qhov thiab feem ntau muaj ntau dua. Rau cov qauv me me thiab nruab nrab cov qauv qauv, nws yog qhov zoo tshaj plaws los xaiv cov khoom siv loj dua saum npoo los yog cov khoom siv los ntawm lub qhov, uas tsis yog tsuas yog ua kom yooj yim rau kev siv phau ntawv soldering, tab sis kuj pab txhawb kev sib txuas zoo dua ntawm cov ntaub qhwv thiab cov teeb liab thaum kuaj xyuas thiab debugging.

Yog tias tsis muaj pob khoom npaj rau hauv cov ntaub ntawv, feem ntau yog ib pob kev cai tsim hauv lub cuab yeej.

2. Siv txoj hauv kev zoo hauv av

Xyuas kom meej tias tus tsim muaj txaus bypass capacitors thiab cov dav hlau hauv av. Thaum siv lub tshuab hluav taws xob sib txuas, nco ntsoov siv lub tshuab hluav taws xob tsim nyog nyob ze ntawm lub tshuab hluav taws xob rau hauv av (zoo dua lub dav hlau hauv av). Lub peev xwm tsim nyog ntawm lub capacitor yog nyob ntawm daim ntawv thov tshwj xeeb, capacitor technology thiab kev khiav hauj lwm zaus. Thaum lub bypass capacitor muab tso rau nruab nrab ntawm lub hwj chim thiab hauv av pins thiab muab tso ze rau qhov tseeb IC tus pin, lub electromagnetic compatibility thiab susceptibility ntawm lub Circuit Court yuav optimized.

3. faib cov khoom siv virtual

Sau ib daim nqi ntawm cov ntaub ntawv (BOM) rau kev kuaj xyuas cov khoom siv virtual. Cov khoom siv virtual tsis muaj kev cuam tshuam nrog ntim thiab yuav tsis raug xa mus rau theem layout. Tsim ib daim nqi ntawm cov ntaub ntawv thiab tom qab ntawd saib tag nrho cov khoom siv virtual hauv kev tsim. Cov khoom nkaus xwb yuav tsum yog lub zog thiab cov teeb liab hauv av, vim tias lawv raug suav hais tias yog cov khoom siv virtual, uas tsuas yog ua tiav hauv schematic ib puag ncig thiab yuav tsis raug xa mus rau cov qauv tsim. Tshwj tsis yog siv rau lub hom phiaj simulation, cov khoom siv uas pom hauv virtual yuav tsum tau hloov nrog cov khoom siv encapsulated.

4. Xyuas kom tseeb tias koj muaj cov ntaub ntawv sau nqi tag nrho

Tshawb xyuas seb puas muaj cov ntaub ntawv txaus hauv daim ntawv tshaj tawm cov ntaub ntawv. Tom qab tsim daim ntawv tshaj tawm cov ntaub ntawv, nws yuav tsum tau ua tib zoo xyuas thiab ua kom tiav cov khoom tsis tiav, cov khoom siv lossis cov ntaub ntawv tsim khoom hauv txhua qhov khoom nkag.

5. Txheeb raws li daim ntawv lo

Txhawm rau ua kom yooj yim rau kev txheeb xyuas thiab saib ntawm daim nqi ntawm cov ntaub ntawv, xyuas kom meej tias cov khoom siv sib txuas ua ke.

6. Txheeb xyuas cov kab hluav taws xob tsis sib xws

Feem ntau hais lus, tag nrho cov inputs ntawm redundant rooj vag yuav tsum muaj cov teeb liab sib txuas kom tsis txhob dangling lub input terminals. Xyuas kom tseeb tias koj tau kuaj xyuas tag nrho cov kev rov ua dua lossis ploj ntawm lub rooj vag, thiab tag nrho cov input input terminals tau txuas tag nrho. Qee zaum, yog tias lub davhlau ya nyob twg nkag tau raug tshem tawm, tag nrho lub kaw lus tsis tuaj yeem ua haujlwm raug. Siv lub dual op amp uas feem ntau siv hauv kev tsim. Yog tias tsuas yog ib qho ntawm op amps siv nyob rau hauv lub dual op amp IC Cheebtsam, nws raug nquahu kom siv lwm qhov op amp, lossis hauv av cov tswv yim ntawm op amp uas tsis siv, thiab siv qhov kev sib koom ua ke tsim nyog (lossis lwm qhov nce) ) Cov lus tawm tswv yim los xyuas kom meej tias tag nrho cov khoom tuaj yeem ua haujlwm ib txwm.

Qee zaum, ICs nrog cov pins ntab yuav tsis ua haujlwm ib txwm nyob hauv qhov kev qhia tshwj xeeb. Feem ntau tsuas yog thaum lub IC ntaus ntawv lossis lwm lub rooj vag hauv tib lub cuab yeej tsis ua haujlwm hauv lub xeev saturated-cov tswv yim lossis cov khoom tawm nyob ze lossis hauv lub zog hluav taws xob ntawm cov khoom siv, IC no tuaj yeem ua tau raws li qhov yuav tsum tau ua thaum nws ua haujlwm. Kev simulation feem ntau tsis tuaj yeem ntes qhov xwm txheej no, vim hais tias tus qauv simulation feem ntau tsis txuas ntau qhov chaw ntawm IC ua ke los ua qauv kev sib txuas ntab ntab.