Mkulu-liwiro PCB kuthetsa. Nayi malamulo asanu ndi anayi:

Rule 1: High-speed signal routing shielding rule

Mumapangidwe a PCB othamanga kwambiri, mizere yayikulu yothamanga ngati mawotchi amafunika kutetezedwa. Ngati satetezedwa kapena kutetezedwa pang’ono, kutayikira kwa EMI kudzayambika. Ndikulimbikitsidwa kuti zingwe zotchinga zibowoleredwe pansi pa 1000mil iliyonse.

Lamulo 2: malamulo otseguka otseguka azizindikiro zothamanga kwambiri

Malamulo otsekedwa otseguka azizindikiro zothamanga kwambiri

Kodi malamulo a EMI ndi otani a PCB othamanga kwambiri

Malamulo otsekedwa otseguka azizindikiro zothamanga kwambiri

Chifukwa cha kuchuluka kwa bolodi la PCB, akatswiri ambiri a PCB LAYOUT amakonda kulakwitsa pokonza waya. Mwanjira ina, netiweki yothamanga kwambiri monga siginecha ya wotchi imapanga zotsatira zotseka mukamalumikiza ma waya angapo a PCB. Zotsatira zotsekedwa zoterezi zimatulutsa tinyanga tating’onoting’ono ndikuwonjezera mphamvu ya radiation ya EMI.

Lamulo 3: malamulo otseguka otseguka azizindikiro zothamanga kwambiri

Malamulo otseguka otseguka azizindikiro zothamanga kwambiri

Kodi malamulo a EMI ndi otani a PCB othamanga kwambiri

Malamulo otseguka otseguka azizindikiro zothamanga kwambiri

Lamulo 2 linanena kuti kutseka kwa ma siginidwe othamanga kudzayambitsa ma radiation a EMI, pomwe kutsegula kotsegulako kumayambitsanso radiation ya EMI.

Ma netiweki othamanga kwambiri, monga siginecha ya wotchi, zotsatira za kutseguka kotseguka zikamapangidwa poyendetsera ma PCB angapo, ma antenna olimba adzapangidwa ndipo mphamvu ya radiation ya EMI idzawonjezeka.

Lamulo 4: kupitilizabe kwamalamulo kupitilizabe kwa zizindikilo zothamanga kwambiri

Chizindikiro cha kupitiliza kwamphamvu kwa zizindikilo zothamanga kwambiri

Kodi malamulo a EMI ndi otani a PCB othamanga kwambiri

Chizindikiro cha kupitiliza kwamphamvu kwa zizindikilo zothamanga kwambiri

Pazizindikiro zothamanga kwambiri, kupitiriza kwa mawonekedwe amachitidwe kuyenera kutsimikiziridwa posintha pakati pa zigawo; Kupanda kutero, ma radiation a EMI adzawonjezeka. That is, the wiring width of the same layer must be continuous, and the wiring impedance of different layers must be continuous.

Lamulo 5: mayendedwe amachitidwe oyendetsa ma PCB othamanga kwambiri

Chizindikiro cha kupitiliza kwamphamvu kwa zizindikilo zothamanga kwambiri

Kodi malamulo a EMI ndi otani a PCB othamanga kwambiri

The cables between two adjacent layers must be routed vertically. Otherwise, crosstalk may occur and EMI radiation may increase. Mwachidule, zigawo zoyandikana ndi zingwe zimatsata njira yopingasa, yopingasa komanso yolunjika, ndipo kulumikizana molunjika kumatha kupondereza chopingasa pakati pamizere.

Rule 6: Topology rules in high-speed PCB design

Kodi malamulo a EMI ndi otani a PCB othamanga kwambiri

Chizindikiro cha kupitiliza kwamphamvu kwa zizindikilo zothamanga kwambiri

In high-speed PCB design, the control of circuit board characteristic impedance and the design of topological structure under multi-load directly determine the success or failure of the product.

Zojambula zamtundu wa Daisy zikuwonetsedwa pachithunzichi, zomwe zimapindulitsa a Mhz ochepa. It is recommended to use the star symmetric structure at the back end in high-speed PCB design.

Lamulo 7: Resonance lamulo la kutalika kwa mzere

Resonance rule of line length

Kodi malamulo a EMI ndi otani a PCB othamanga kwambiri

Resonance rule of line length

Onani ngati kutalika kwa mzere wazizindikiro komanso kuchuluka kwa chizindikirocho kumapangitsa kumveka, pomwe kutalika kwa zingwe kumakhala nthawi zonse za 1/4, kulumikizana kumeneku kumatulutsa kumveka, ndikumveka kwa mafunde kumatulutsa mafunde amagetsi, kubweretsa kusokonezedwa.

Rule 8: Backflow path rule

Njira yobwerera m’mbuyo

Kodi malamulo a EMI ndi otani a PCB othamanga kwambiri

Njira yobwerera m’mbuyo

All high-speed signals must have a good backflow path. Chepetsani njira yobwerera m’mbuyo yazizindikiro zothamanga kwambiri monga mawotchi. Otherwise the radiation will greatly increase, and the amount of radiation is proportional to the area surrounded by the signal path and the backflow path.

Lamulo 9: Malamulo opangira ma capacitor osintha zida

Malamulo oyika makina opangira zida

Kodi malamulo a EMI ndi otani a PCB othamanga kwambiri

Malamulo oyika makina opangira zida

Malo a decoupling capacitor ndikofunikira kwambiri. Kukhazikitsa kosayenera sikungakwaniritse kuwonongeka. Mfundo yake ndiyi: pafupi ndi pini yamagetsi, ndi zingwe zamagetsi zamagetsi za capacitor ndi nthaka yozunguliridwa ndi dera laling’ono kwambiri.