Nekuvandudzwa kwezvigadzirwa zvevatengi, zvishoma nezvishoma inokura munzira yehungwaru, saka izvo zvinodikanwa zvePCB board impedance zviri kuramba zvichiwedzera kuomarara, izvo zvinosimudzirawo kuenderera mberi kweiyo impedance dhizaini tekinoroji.
Chii chinonzi impedance?
1. Kurwisana kunokonzerwa nekushandura ikozvino muzvikamu kune chokuita ne capacitance uye inductance. Kana paine yemagetsi chiratidzo waveform transmission mune conductor, kushorwa kwainogamuchira kunonzi impedance.
2. Kupikisa ndiko kupikisa kunokonzerwa neakananga ikozvino pane zvikamu, izvo zvinoenderana nemagetsi, resistivity uye ikozvino.
Kushandiswa kweCharacteristic Impedance
1. Zvinhu zvemagetsi zvinopihwa nebhodhi rakadhindwa rinoiswa kune yakakwira-kumhanya chiratidzo chekufambisa uye yakakwirira-frequency maseketi anofanirwa kunge akaita zvekuti hapana kuratidzwa kunoitika panguva yekufambisa kwechiratidzo, chiratidzo chinoramba chakasimba, kurasikirwa kwekutapurirana kunoderedzwa, uye mhedzisiro yekufananidza. inogona kuwanikwa. Yakazara, yakavimbika, yakarurama, isina-kunetseka, isina ruzha-isina kutapurirana chiratidzo.
2. Saizi ye impedance haigone kunzwisiswa nyore. Iyo yakakura zviri nani kana diki zviri nani, kiyi inofananidzira.
Dzora zvimiro zvehunhu impedance
Iyo dielectric inogara yebepa, ukobvu hweiyo dielectric layer, upamhi hwemutsara, ukobvu hwemhangura, uye ukobvu hwemasolder mask.
Kufurira uye kutonga kwe solder mask
1. Ukobvu hwe solder mask hauna mhedzisiro pane iyo impedance. Kana ukobvu hwemasolder mask huchiwedzera ne10um, iyo impedance kukosha inoshanduka chete ne1-2 ohms.
2. Muchigadziro, musiyano pakati pekuvhara solder mask uye isina-cover solder mask yakakura, imwe-inopera 2-3 ohms, uye yakasiyana 8-10 ohms.
3. Mukugadzirwa kweimpedance board, ukobvu hwemasolder mask hunowanzo kudzorwa zvinoenderana nezvinodiwa zvekugadzira.
Impedance test
Iyo yakakosha nzira ndeye TDR nzira (nguva domain reflectometry). Nheyo yakakosha ndeyokuti chiridzwa chinoburitsa chiratidzo chekupuruzira, icho chinopetwa kumashure kuburikidza nechikamu chekuyedza chebhodhi redunhu kuyera shanduko yehuhu impedance kukosha kwekuburitsa uye foldback. Mushure mekuongorora kwekombuta, iyo hunhu impedance inobuda.
Impedance kugadzirisa dambudziko
1. Nokuda kwezvigadziro zvekutonga zve impedance, zvido zvekutonga zvinogona kuwanikwa kuburikidza nekugadzirisa pamwe chete mukugadzirwa.
2. Mushure mekugadzirisa mukugadzirwa, bhodhi rinochekwa uye rinoongororwa. Kana hupamhi hwepakati hwakaderedzwa, mutsara wakafara unogona kuderedzwa kuti uenderane nezvinodiwa; kana yakanyanya kukora, mhangura inogona kukwizwa kuti ideredze iyo impedance kukosha.
3. Mukuedza, kana pane musiyano mukuru pakati pedzidziso uye chaiyo, mukana mukuru ndewekuti pane dambudziko nekugadzirwa kweinjiniya uye dhizaini yebvunzo strip.
Nguva yekutumira: Mar-15-2022