Imithetho okufanele ilandelwe ekwakhiweni kwe-PCB

Imithetho okufanele ilandelwe PCB design

1) Imithetho yesekethe yomhlabathi:

Umthetho omncane we-loop usho ukuthi indawo yeluphu eyakhiwe ulayini wesiginali kanye ne-loop yayo kufanele ibe ncanyana ngangokunokwenzeka. Indawo encanyana yeluphu, imisebe yangaphandle ingaphansi futhi nokuthikamezeka okuncane kwangaphandle kutholwa. Ngokwalo mthetho, ukwabiwa kwebhanoyi lomhlaba kanye nokuhanjiswa kwemigwaqo ebalulekile kufanele kubhekwe ngesikhathi sokuhlukaniswa kwamabhanoyi omhlaba ukugwema izinkinga ezibangelwa ukugunda kwendiza yaphansi. Ekuklanyeni kwamapuleti aphindwe kabili, esimweni sekhefu esanele sokuphakelwa kukagesi, kufanele kube yingxenye yokugcwalisiwe kubhekiswe ngakwesobunxele, bese ufaka izimbobo ezithile ezidingekayo, xhuma amasiginali anezinhlangothi ezimbili kahle, kolunye lwesiginali esiyinhloko esisebenzisa umhlabathi ngangokunokwenzeka, ekwakhiweni kwemvamisa ethile ephezulu, ukucatshangelwa okukhethekile kufanele kube inkinga yendiza yesekethe yesiginali, kuphakanyiswa ipuleti lesangweji kunconyiwe.

ipcb

2) Ukulawula okuphazamisayo

I-CrossTalk isho ukuphazanyiswa kokunye phakathi kwamanethiwekhi ahlukile ku-PCB ngenxa yezintambo ezinde ezihambisanayo, ikakhulukazi ngenxa yokusatshalaliswa kwamandla nokusatshalaliswa kwe-inductance phakathi kwemigqa efanayo. Izinyathelo eziyinhloko zokunqoba i-crosstalk yilezi:

Khulisa isikhala sokufaka ikhebula ngokufana bese ulandela umthetho we-3W.

Faka izihlukanisi ezisisekelo phakathi kwemigqa efanayo.

Nciphisa ibanga phakathi kongqimba lwezintambo nendiza yomhlabathi.

3) Ukuvikela ukuvikela

Ungavumeli umkhawulo owodwa untante.

Inhloso enkulu ukugwema “ukusebenza kwe-antenna” nokunciphisa ukuphazamiseka okungadingekile ngemisebe nokwamukelwa, okungaletha imiphumela engalindelekile.

6) Impedance imithetho efanayo yokuhlola:

Esikhathini esisheshayo sesekethe yedijithali, ngaphezulu kwesikhathi lapho isikhathi sokulibaziseka se-PCB wiring signal sikhuphuka isikhathi (noma phansi) ikota, i-wiring injengolayini wokudlulisa, ukuze kuqinisekiswe ukuthi isignali yokufaka nokukhipha impedance ehambelana ne-impedance kwemigqa yokudlulisela kahle, ungasebenzisa izinhlobo ezahlukahlukene zendlela yokufanisa, ukukhetha indlela yokufanisa nokuxhumeka kwenethiwekhi kanye nesakhiwo sokwakheka kwezintambo.

A. Ngokuxhuma kwephoyinti nephuzu (okukodwa okukhiphayo kufana nokufaka okukodwa), ungakhetha ukuqala ukufanisa uchungechunge noma ukufanisa okufana nokugcina. Owokuqala unesakhiwo esilula, izindleko eziphansi, kepha ukubambezeleka okukhulu. Lesi sakamuva sinomphumela omuhle wokufanisa, kepha isakhiwo esiyinkimbinkimbi nezindleko eziphezulu.

B. Ngokuxhuma kwephoyinti ukuya kweye-multipoint (okukhiphayo okukodwa kufana nokukhishwa okuningi), uma ukwakheka kwesimo saphezulu senethiwekhi kuyiketanga le-Daisy, kufanele kukhethwe ukufaniswa kokugcina okufanayo. Lapho inethiwekhi iyisakhiwo senkanyezi, bhekisa kusakhiwo se-point-to-point.

I-Star ne-Daisy chain yizakhiwo ezimbili eziyisisekelo zokwakheka komhlaba, kanti ezinye izakhiwo zingathathwa njengokuguqulwa kwesakhiwo esiyisisekelo, futhi ezinye izindlela eziguquguqukayo zingathathwa ukufanisa. Ngokwenza, izindleko, ukusetshenziswa kwamandla kanye nokusebenza kufanele kubhekwe. Ngokuvamile, ukufaniswa okuphelele akulandelwa, inqobo nje uma ukuboniswa nokunye ukuphazamiseka okubangelwa ukungafani kahle kunqunyelwe ebangeni elamukelekayo.