Kufuratira uye saizi yekudzora nyaya mune 2-layer PCB stack-ups

Tikugashirei kuCapel's blog, kwatinokurukura zvese zvinhu zvine chekuita nePCB. Muchikamu chino, tichagadzirisa zvinonetsa mu 2-layer PCB stackup kuvaka uye nekupa mhinduro dzekugadzirisa flatness uye saizi yekudzora nyaya.Capel anga ari mugadziri anotungamira weRigid-Flex PCB, Flexible PCB, uye HDI PCB kubvira 2009. Tine vanopfuura zana mainjiniya vane hunyanzvi vane makore anopfuura 15 eruzivo muindasitiri yePCB uye vakazvipira kupa vatengi PCB yemhando yepamusoro. mhinduro.

Flatnesschinhu chakakosha chekufunga kana uchishanda nePCB stackups sezvo ichikanganisa zvakananga kuita kwese uye kuvimbika kwechigadzirwa chekupedzisira. Iyo yakakwana flat PCB yakakosha kumusangano unoshanda, kurongeka kwechikamu, uye kudzima kupisa kunoshanda. Chero kutsauswa kubva flatness kunogona kutungamirira murombo solder majoini kuumbwa, chikamu misalignment, kana kunyange kushushikana pamusoro redunhu bhodhi izvo zvinogona kutungamirira magetsi shorts kana kuvhura.

Dimensional controlchimwe chinhu chakakosha mukugadzirwa kwePCB, sezvo ichiva nechokwadi chekuti bhodhi rinonyatsokwana mukati mekuvharirwa kwayo kwakatarwa. Chaiyo dimensional control inobvumira iyo PCB kuti ibatanidzwe muchikamu chekupedzisira, kudzivirira kukanganiswa nezvimwe zvikamu kana zvimiro.

Ngationgororei mune dzimwe mhinduro dzinoshanda dzekukunda flatness uye dimensional kudzora nyaya mune 2-layer PCB stackups.

1. Kusarudzwa kwezvinhu:
Kusarudza iyo chaiyo zvinhu ndiyo hwaro hweiyo flat PCB. Sarudza emhando yepamusoro laminates ane yakanakisa dimensional kugadzikana. Funga kushandisa yakaderera CTE (coefficient of thermal expansion) zvinhu zvakaita seFR-4, izvo zvinoderedza njodzi ye warping nekuda kwekushanduka kwekushisa panguva yekugadzira kana kushandiswa.

2. Yakarurama stacking order:
Kurongeka kwezvikamu mune stack kunogona kukanganisa zvakanyanya flatness. Ita shuwa kuti iwo akaturikidzana akanyatsoenderana uye kuti musimboti uye prepreg zvinhu zvakagovaniswa symmetrically. Kuenzanisa kugoverwa kwemhangura yemhangura mukati me stack inosimudzirawo yunifomu yekupisa kwekuwedzera, nokudaro kuderedza mikana yehondo.

3. Inodzorwa impedance nzira:
Kuita inodzorwa impedance traces haina kungokosha kune chiratidzo chekutendeseka asiwo kunobatsira kuchengetedza flatness. Shandisa impedance-inodzorwa nzira dzekudzivirira kudzivirira yakawandisa misiyano mukukora kwemhangura pabhodhi, izvo zvinogona kukonzera kukotama kana kuputika.

4. Vias uye akaputirwa nemumakomba:
Kuvapo kwevias uye kuputirwa nemakomba (PTH) kunogona kuunza kushushikana pfungwa uye kukanganisa flatness. Dzivisa kuisa vias kana PTHs munzvimbo dzavanogona kukanganisa kutendeseka kwebhodhi. Pane kudaro, funga kushandisa mapofu kana kuvigwa vias kuti uderedze chero chingangoitika warping inokonzerwa nekuchera kana plating maitiro.

5. Kutarisira kupisa:
Kuve nechokwadi chekubvisa kupisa kwakanaka kwakakosha kuchengetedza flatness. Thermal vias anoshandiswa kufambisa kupisa kure nenzvimbo dzinopisa pabhodhi redunhu. Pamusoro pezvo, funga kushandisa ndege yemhangura kana sink yekupisa kuti ibvise kupisa zvakanyanya. Kukwana kwekutonga kwemafuta hakungodzivisi kurwa, asiwo kunosimudzira kuvimbika kwese kwePCB.

6. Kunyatsogadzira maitiro:
Shanda nemugadziri ane mukurumbira saCapel ane ruzivo rwakakura mukugadzira maPCB emhando yepamusoro. Matekinoroji ekugadzira epamberi, anosanganisira precision etching, controlled lamination uye multi-layer pressing, zvakakosha kuti uwane flatness uye dimensional control.

7. Matanho ekudzora kunaka:
Matanho akasimba ekudzora emhando anoitwa mukati mekugadzira maitiro. Izvi zvinosanganisira kuongororwa nguva dzose, matekiniki epamusoro metrology uye kutevedzera zviyero zveindasitiri. Kunyatso kudzora kwemhando kunovimbisa kuti flatness uye dimensional control zvinodiwa zvinogara zvichisangana.

Muchidimbu,flatness uye dimensional control yakakosha pakubudirira kweiyo 2-layer PCB stackup. Nekunyatsosarudza zvinhu, uchitevera iyo chaiyo stacking kutevedzana, kuita inodzorwa impedance routing, kutonga kupisa nemazvo, uye kushanda nemugadziri ane ruzivo akaita seCapel, unogona kukunda matambudziko aya uye uwane yepamusoro PCB kuita. Usakanganise paPCB mhando - vimba neCapel kuzadzisa zvese zvaunoda paPCB.