Mitemo inofanirwa kuteverwa mukati PCB patani

1) Ground redunhu mitemo:

Mutemo wechiuno wepasi unoreva kuti nzvimbo yakatenderera inoumbwa netambo yechiratidzo uye chiuno chayo chinofanira kunge chiri chidiki sezvazvinogona. Iyo diki nzvimbo ye loop ndeye, iyo shoma yekunze radiation iri uye kushomeka kwekunze kwekunze kunogamuchirwa. Sekureva kwemutemo uyu, kugoverwa kwenzvimbo yepasi uye yakakosha nzira yekuratidzira inofanirwa kutariswa panguva yekuparadzaniswa kwendege yepasi kudzivirira matambudziko anokonzerwa nepasi pevhu grooving. Mune dhizaini dhizaini, mune zororo rakaringana nzvimbo yemagetsi, inofanirwa kuve chikamu cheiyo izere ichinongedzera kuruboshwe, uye wedzera mamwe maburi anodikanwa, batanidza mativi-maviri akasimba zvakanaka, kune imwe yechiratidzo chakakosha kutora pasi nepazvinogona napo, kune dhizaini yeimwe yakakwira frequency, yakakosha kutariswa inofanirwa kuve kune ndege dambudziko redhiyo yechiratidzo, yakakurudzirwa sangweji ndiro inokurudzirwa.

2) Kudzora kutonga

CrossTalk inoreva kupindirana pakati pema network akasiyana paPCB nekuda kwetambo refu yakafanana, kunyanya nekuda kwekugovaniswa capacitance uye kugovera inductance pakati pemitsara yakafanana. Matanho makuru ekukunda crosstalk ndeaya:

Wedzera nzvimbo yekufananidza cabling uye uteedzere iwo 3W mutemo.

Isa zvakasarudzika zvakasarudzika pakati pemitsara yakafanana.

Deredza kureba pakati peiyo wiring layer uye iyo yepasi ndege.

3) Kuchengetedza

Usatendere imwe mugumo kuyangarara.

Chinangwa chikuru ndechekudzivirira iyo “antenna athari” uye kudzikisira zvisina basa kukanganiswa nemwaranzi uye kugamuchirwa, izvo zvingangounza mhedzisiro isingafungidzirwe.

6) Impedance inoenderana yekuongorora mitemo:

Mune yakakwira-inomhanya yedhijitari wedunhu, inopfuura kana nguva yekunonoka yePCB wiring chiratidzo ichisimuka nguva (kana pasi) kota, iyo wiring yakafanana netambo yekufambisa, kuitira kuona kuti chiratidzo chekupinza uye chekubuda impedance inoenderana neiyo impedance yetambo dzekufambisa nenzira kwayo, unogona kushandisa dzakasiyana siyana nzira dzinoenderana, sarudzo yekufananidza nzira uye netiweki yekubatanidza uye wiring topology chimiro.

A. Zvekubatanidza poindi-ku-poindi (chimwe chinobuda chinoenderana nekuisa kumwe chete), unogona kusarudza kutanga nhevedzano dzinoenderana kana dzinoenderana dzinoenderana. Iyo yekutanga ine yakapusa chimiro, yakaderera mutengo, asi huru kunonoka. Iyo yekupedzisira ine yakanaka inoenderana mhedzisiro, asi yakaoma chimiro uye yakakwira mutengo.

B. Yekubatanidza-kune-multipoint kubatana (chimwe chinobuda chinoenderana nezvakawanda zvinobuda), kana chimiro chetopiki yenzvimbo yedandemutande iri Daisy cheni, inowirirana inofananidzwa netemu inofanira kusarudzwa. Kana iwo mambure iri nyeredzi dhizaini, tarisa kune iyo poindi-kune-poindi chimiro.

Nyeredzi neDaisy cheni zvinhu zviviri zvakakosha zveatopiki, uye zvimwe zvivakwa zvinogona kutariswa sekushandurwa kwechimiro chekutanga, uye mamwe matanho anoshanduka anogona kutorwa kuti aenzane. Mukuita, mutengo, kushandiswa kwesimba uye kuita kunofanirwa kutarisirwa. Muzhinji, kuenzanisa kwakaringana hakuteedzerwe, sekureba sekuratidzira uye kumwe kukanganisa kuchikonzerwa nekutadza kukwana kunogumira padanho rinogamuchirwa.