Uhlalutyo lobhedu lusasazekile PCB

Ukuba kukho umhlaba omninzi we-PCB, i-SGND, i-AGND, i-GND, njl.

Kukho izizathu ezininzi zokubeka ubhedu ngokubanzi. 1, EMC. Kwindawo enkulu yomhlaba okanye yokuhambisa umbane ebeka ubhedu, iya kudlala indima yokukhusela, enye ikhethekileyo, njengePGND idlala indima yokhuselo.

2. Iimfuno zenkqubo ye-PCB. Ngokubanzi, ukuze kuqinisekiswe ukusebenza kwe-electroplating, okanye akukho deformation ye-lamination, kwibhodi ye-PCB enobumba obuncinci be-wiring.

I-3, imfuno yesiginali yokuqina, nika isantya esiphakamileyo isiginali yedijithali umendo opheleleyo wokubuya, kunye nokunciphisa ii-wiring zenethiwekhi ze-dc. Ewe kunjalo, kukho ukusasaza ubushushu, iimfuno ezizodwa zofakelo lwezixhobo zevenkile ubhedu njalo njalo. Kukho izizathu ezininzi zokubeka ubhedu ngokubanzi.

1, EMC. Kwindawo enkulu yomhlaba okanye yokuhambisa umbane ukusasaza ubhedu, iya kudlala indima yokukhusela, ekhethekileyo, njenge-PGND idlala indima yokhuselo.

2. Iimfuno zenkqubo ye-PCB. Ngokubanzi, ukuze kuqinisekiswe ukusebenza kwe-electroplating, okanye akukho deformation ye-lamination, kwibhodi ye-PCB enobumba obuncinci be-wiring.

I-3, imfuneko yokuthembeka komqondiso, ukuya kumaza ombane wedijithali opheleleyo wendlela yokubuyela umva, kunye nokunciphisa ii-wiring zenethiwekhi ze-DC. Ewe kunjalo, kukho ukusasaza ubushushu, iimfuno ezizodwa zofakelo lwezixhobo zevenkile ubhedu njalo njalo.

Ivenkile, uncedo olukhulu kubhedu ukunciphisa impedance yomhlaba (bekukho indawo enkulu ekuthiwa yi-anti-jamming ukunciphisa impedance yomhlaba) yesekethe yedijithali ikhona kwinani elikhulu le-pulse yangoku, ngaloo ndlela kuncitshiswa umhlaba Impedance iyimfuneko ngakumbi kwabanye, kukholelwa ngokubanzi ukuba kwisekethe yonke enziwe ngezixhobo zedijithali kufuneka ibe ngumgangatho omkhulu, kwisekethe ye-analog, Umtya womhlaba owenziwe ngokubeka ubhedu uya kubangela ukuphazamiseka kokubambana kwe-electromagnetic (ngaphandle kweesekethe eziphezulu). Ke ngoko, ayizizo zonke iisekethe ezifuna ubhedu kwindalo iphela (i-BTW: intsebenzo yenethiwekhi yobhedu ilunge kunebhloko yonke)

Okwesibini, ukubaluleka kwesekethe yokubeka ubhedu kulele: 1, ukubeka ucingo lobhedu kunye nocingo lomhlaba kudityanisiwe kunye, ukuze sinciphise indawo yesekethe 2, isasaze indawo enkulu yobhedu elinganayo ukunciphisa ukumelana nomhlaba, kunciphise ukwehla koxinzelelo kula manqaku mabini, omabini amanani, okanye ukulinganisa Ukubeka ubhedu ukuze kwandiswe amandla okuchasana nokuphazamiseka, kwaye ngexesha lokuhamba rhoqo kufuneka kusasaze umhlaba wabo wedijithali kunye ne-analog ukwahlula ubhedu, emva koko banxibelelana ngenqaku elinye, Inqaku elinye linokudibaniswa nenxeba yocingo ejikeleze iringi yamagnetic amaxesha amaninzi. Nangona kunjalo, ukuba amaza aphakamileyo akaphakamanga kakhulu, okanye iimeko zokusebenza kwesixhobo azimbi, zinokukhululeka. I-crystal oscillator isebenza njengesixhobo sokuhambisa isantya esiphezulu kwisekethe. Unokubeka ubhedu ngeenxa zonke kuwo kwaye ucole iqokobhe lekristale, okungcono.

Uyintoni umahluko phakathi kwebhloko yonke yobhedu kunye negridi? Ngokucacileyo ukuhlalutya malunga neendidi ezi-3 zeziphumo: 1 intle 2 ingcinezelo yengxolo 3 ukunciphisa isiphazamiso esihamba rhoqo (kwinguqulelo yesekethe yesizathu) ngokwesikhokelo se-wiring: amandla ngokwenziwa ngokubanzi ngangokunokwenzeka kutheni ukongeza Igridi ah ayihambisani nomgaqo ayihambelani nayo? Ukuba ngokwembono yokuhamba rhoqo, ayilunganga intambo yokuhamba ngesantya esiphezulu xa olona taboo lubukhali, kumaleko okuhambisa umbane uneedigri ezingaphezu kwe-90 ziingxaki ezininzi. Kutheni le nto uyenza ngoluhlobo ingumbandela wobugcisa: jonga ezintsimbi zenziwe ngesandla kwaye ubone ukuba zipeyintiwe ngaloo ndlela. Uyabona lo mzobo kwaye ndiqinisekile ukuba bekukho i-chip kuwo kuba bekukho inkqubo ebizwa ngokuba yi-wave soldering xa uyibeka kwaye wayezakufudumeza ibhodi ekuhlaleni kwaye ukuba uyifaka kubhedu ii-coefficients ezithile zobushushu kumacala omabini ahlukile kwaye ibhodi yayiya kuthi xhaxhe emva koko ingxaki ivele, Kwisigqubuthelo sensimbi (esifunwa yinkqubo), kulula kakhulu ukwenza iimpazamo kwi-chip ye-chip, kwaye inqanaba lokwala liya kunyuka ngokuthe ngqo. Ngapha koko, le ndlela ikwanazo nezinto ezingalunganga: Phantsi kwenkqubo yethu yokubola: Kulula kakhulu ukuba ifilimu inamathele kuyo, kwaye ke kwiprojekthi yeasidi, inqaku alinakonakalisa, kwaye kukho inkunkuma eninzi, kodwa ukuba ikho, yibhodi eyaphukileyo kuphela kwaye sisixhobo esihla nayo ibhodi! Ukusuka kolu luvo, ngaba uyabona ukuba kutheni kwakutsalwe ngale ndlela? Ewe kunjalo, kukho ezinye iitafile zokuncamathisela ngaphandle kwegridi, ukusuka kwindawo yokujonga ukungqinelana kwemveliso, kunokubakho iimeko ezi-2: 1, inkqubo yakhe yokubola ilungile kakhulu; 2. Esikhundleni sokutshangatshiswa kwamaza, usebenzisa i-welding ehamba phambili, kodwa kule meko, utyalo-mali lwalo lonke ibandla luya kuba ngamaxesha angama-3-5 aphezulu.