Kwamitin PCB impedance yana nufin sigogi na juriya da amsawa, wanda ke hana alternating current. A cikin samar da allunan kewayawa na PCB, sarrafa impedance yana da mahimmanci. Me yasa allunan kewayawa na PCB suna buƙatar impedance?

1. Da’irar PCB (ƙasa na allo) yakamata yayi la’akari da toshewa da shigar da kayan aikin lantarki, kuma yakamata a yi la’akari da aiki da aikin watsa siginar bayan an toshe facin SMT na baya. Saboda haka, ƙananan impedance, mafi kyau, musamman siginar microwave. Don kayan aiki, abin da ake buƙata don tsayayya shine: ƙasa da 1&TIME; 10-6 a kowace murabba’in santimita.

2. A cikin tsarin samar da allunan da’ira na pcb, dole ne su bi matakai kamar su nutsewa tagulla, plating tin (ko plating, ko thermal spray tin), soldering connector, da dai sauransu, kuma kayan da ake amfani da su a cikin waɗannan hanyoyin dole ne su tabbatar. cewa resistivity yana da ƙasa, don tabbatar da cewa gabaɗaya impedance na allon kewayawa yana da ƙasa don biyan buƙatun ingancin samfur kuma yana iya aiki akai-akai.

Na uku, tin plating na allunan da’ira na pcb shi ne ya fi fuskantar matsaloli wajen samar da alluran da’ira baki daya, kuma shi ne mahimmin hanyar da ke yin tasiri a kan abin da ya faru. Babban lahani na murfin tin mara amfani shine sauƙi canza launi (sauki don zama oxidized ko rashin ƙarfi) da ƙarancin solderability, wanda zai haifar da wahala mai wahala na allon kewayawa, babban impedance, ƙarancin wutar lantarki, ko rashin kwanciyar hankali na aikin hukumar gabaɗaya.

4. Akwai nau’o’in sigina daban-daban a cikin masu gudanarwa na hukumar pcb. Lokacin da mitar dole ne a ƙara domin ƙara yawan watsa shi, idan da’irar da kanta daban-daban saboda dalilai kamar etching, tari kauri, waya nisa, da dai sauransu, impedance darajar zai canza. , Don haka siginar sa ya lalace kuma aikin daftarin aiki ya lalace, don haka ya zama dole don sarrafa ƙimar impedance a cikin wani kewayon.