PCB pangani njira yolumikizira ma analogi yothamanga kwambiri

M’lifupi mwake m’lifupi mwake, mphamvu yotsutsana ndi kusokoneza ndi yabwinoko khalidwe la chizindikiro (chikoka cha khungu). Koma nthawi yomweyo, kufunikira kwa 50Ω kuyenera kutsimikiziridwa. Bolodi wamba FR4, pamwamba mzere m’lifupi 6MIL impedance ndi 50Ω. Izi mwachiwonekere sizingakwaniritse zomwe zimafunikira pakuyika kwa analogi othamanga kwambiri, chifukwa chake nthawi zambiri timagwiritsa ntchito GND02 ndikuilola kuti itchule gawo la ART03. Mwanjira iyi, chizindikiro chosiyanitsa chikhoza kuwerengedwa ngati 12/10, ndipo mzere umodzi ukhoza kuwerengedwa ngati 18MIL. (Dziwani kuti kukula kwa mzere kumaposa 18MIL ndiyeno kukulitsa kulibe tanthauzo)

PCB imapanga njira ndi malamulo othamanga kwambiri a analogi

CLINE yosonyezedwa zobiriwira pachithunzichi imatanthawuza kuyika kwa mzere umodzi ndi kusiyanitsa kwa analogi othamanga kwambiri a ART03 wosanjikiza. Pochita izi, zinthu zina ziyenera kuchitidwa:

(1) Gawo loyerekeza la TOP wosanjikiza liyenera kupakidwa, monga momwe tawonetsera pachithunzi pamwambapa. Tiyenera kuzindikira kuti mtunda wochokera pansi pa mkuwa kupita kumalo olowera analogi CLINE uyenera kukhala 3W, ndiko kuti, AIRGAP kuchokera pamphepete mwa mkuwa kupita ku CLINE ndi kawiri mzere wa mzere. Malinga ndi mawerengero ena a electromagnetic theoretical theoretical calculations and simulations, maginito ndi gawo lamagetsi la mizere yamagetsi pa PCB zimagawidwa makamaka mkati mwa 3W. (Kusokoneza kwaphokoso kuchokera kuzizindikiro zozungulira ndikochepera kapena kofanana ndi 1%).

(2) Mkuwa wa GND wa gawo labwino la malo a analoji uyeneranso kukhala wolekanitsidwa ndi dera lozungulira la digito, ndiko kuti, zigawo zonse ndizodzipatula.

(3) Pobowola GND02, nthawi zambiri timabowola malo onsewa, kotero kuti ntchitoyo ndi yosavuta ndipo palibe vuto. Koma poganizira zatsatanetsatane kapena kuti tichite bwino, titha kungotseka gawo la waya wa analogi, chimodzimodzi ndi TOP layer, dera la 3W. Izi zitha kutsimikizira mtundu wa chizindikiro komanso kusalala kwa bolodi. Zotsatira za processing ndi izi:

PCB imapanga njira ndi malamulo othamanga kwambiri a analogi

Mwanjira iyi, njira yobwereranso ya siginecha yolowera yothamanga kwambiri ya analogi imatha kubwezeredwanso mwachangu pagawo la GND02. Ndiko kuti, njira yobwerera pansi yofananizidwa imakhala yaifupi.

(4) Mosakhazikika nkhonya ambiri a GND vias mozungulira mkulu-liwiro analogi chizindikiro kuti analogi chizindikiro kuyenda mmbuyo mofulumira. Imathanso kuyamwa phokoso.

PCB imapanga malamulo oyendetsera ma siginali othamanga kwambiri

Lamulo 1: Malamulo oteteza ma siginecha othamanga kwambiri a PCB Mu mapangidwe othamanga kwambiri a PCB, kuwongolera kwa mizere yayikulu yothamanga kwambiri monga mawotchi kuyenera kutetezedwa. Ngati palibe chishango kapena gawo lokhalo, zingayambitse kutayikira kwa EMI. Ndikofunikira kuti waya wotetezedwa atsike ndi dzenje pa 1000 mil.

PCB imapanga njira ndi malamulo othamanga kwambiri a analogi

Lamulo 2: Malamulo oyendetsa ma siginecha othamanga kwambiri

Chifukwa cha kachulukidwe kachulukidwe ka ma board a PCB, akatswiri ambiri a PCB KANKHANI sachedwa kulakwitsa poyendetsa, ndiye kuti, maukonde othamanga kwambiri monga ma siginecha a wotchi, omwe amatulutsa zotsatira zotsekeka poyendetsa ma PCB osiyanasiyana. Chifukwa cha kutsekedwa kotereku, mlongoti wa loop udzapangidwa, womwe udzawonjezera mphamvu ya EMI.

PCB imapanga njira ndi malamulo othamanga kwambiri a analogi

Lamulo 3: Malamulo othamanga kwambiri oyendetsa ma siginecha otseguka

Lamulo 2 limatchula kuti kuzungulira kotsekedwa kwa ma siginecha othamanga kwambiri kumayambitsa ma radiation a EMI, koma kuzungulira kotseguka kumayambitsanso ma radiation a EMI.

Maulumikizidwe othamanga kwambiri monga ma siginecha a wotchi, pomwe chotuluka chotseguka chikachitika pomwe ma multilayer PCB ayendetsedwa, mlongoti wolumikizana umapangidwa, zomwe zimawonjezera mphamvu ya radiation ya EMI.

PCB imapanga njira ndi malamulo othamanga kwambiri a analogi

Lamulo 4: Khalidwe losalekeza kupitilira lamulo la siginecha yothamanga kwambiri

Pazizindikiro zothamanga kwambiri, mawonekedwe amtunduwu ayenera kukhala mosalekeza mukasinthana pakati pa zigawo, apo ayi zidzawonjezera ma radiation a EMI. M’mawu ena, m’lifupi mwake mawaya a wosanjikiza womwewo ayenera kukhala mosalekeza, ndi impedance mawaya a zigawo zosiyanasiyana ayenera mosalekeza.

PCB imapanga njira ndi malamulo othamanga kwambiri a analogi

Lamulo 5: Malamulo owongolera ma waya pamapangidwe apamwamba kwambiri a PCB

Mawaya apakati pa zigawo ziwiri zoyandikana ayenera kutsatira mfundo ya mawaya oyimirira, apo ayi zingayambitse kuphatikizika pakati pa mizere ndikuwonjezera ma radiation a EMI.

Mwachidule, mawaya oyandikana nawo amatsatira njira zowongoka komanso zowongoka, ndipo mawaya oyimirira amatha kupondereza kupatuka pakati pa mizereyo.

PCB imapanga njira ndi malamulo othamanga kwambiri a analogi

Lamulo lachisanu ndi chimodzi: Malamulo a chikhalidwe chapamwamba pamapangidwe apamwamba a PCB

M’mapangidwe othamanga kwambiri a PCB, kuwongolera kwa mawonekedwe a bolodi loyang’anira dera ndi mapangidwe amtundu wa topological pansi pamikhalidwe yolemetsa zambiri zimatsimikizira kupambana kapena kulephera kwa chinthucho.

Chithunzichi chikuwonetsa mawonekedwe a daisy chain topology, omwe nthawi zambiri amakhala opindulitsa akagwiritsidwa ntchito pang’ono Mhz. Ndikoyenera kugwiritsa ntchito mawonekedwe ofananirako a nyenyezi kumbuyo kwa mapesi pamapangidwe apamwamba kwambiri a PCB.

PCB imapanga njira ndi malamulo othamanga kwambiri a analogi

Lamulo 7: Lamulo la resonance la kutalika kwa trace

Yang’anani ngati kutalika kwa mzere wa siginecha ndi ma frequency a siginecha kumapanga resonance, ndiye kuti, kutalika kwa waya ndi kuchuluka kwa mafunde amtundu wa 1/4, mawayilesi amamveka, ndipo kumveka kwake kumawunikira mafunde amagetsi. ndi kuyambitsa kusokoneza.