Nekuvandudzwa kwezvigadzirwa zvevatengi, zvishoma nezvishoma inokura munzira yehungwaru, saka izvo zvinodiwa zvePCB board impedance zviri kuramba zvichiwedzera kuomarara, izvo zvinosimudzirawo kuenderera mberi kwekukura 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. Mamiriro emagetsi anopiwa nebhodhi rakadhindwa rinoshandiswa kune-high-speed signal transmission uye high-frequency circuits inofanira kunge yakadaro zvokuti hapana kuratidzwa kunoitika panguva yekufambisa kwechiratidzo, chiratidzo chinoramba chakasimba, kurasikirwa kwekutapurika kunoderedzwa, uye kuenzanisa kwekuita. 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 iri kuenderana.
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, zvinodiwa zvekutonga zvinogona kuwanikwa kuburikidza nekugadzirisa pamwe chete mukugadzirwa.
2. Mushure mekugadzirisa mukugadzirwa, bhodhi rinochekwa uye rinoongororwa.Kana hupamhi hwepakati hwakaderedzwa, upamhi hwemutsara hunogona kuderedzwa kuti huenderane nezvinodiwa;kana yakanyanya kukora, mhangura inogona kukwizwa kuti ideredze kukosha kwe impedance.
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